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Can you reuse torque to yield head bolts


Can you reuse torque to yield head bolts


You should be able to reuse the bolts, assuming that they have not been reused before. You can also get ARP for $49. com: torque to yield bolts. Sep 11, 2019 · Some bolts are "torque to yield", and some are "torque plus angle". Can GM's multi-layer steel head gaskets be reused? I'm 99% sure I didn't torque the lifter guide hold down bolts between one of the many interruptions I had today. These are designed to be tightened to the point they physically start to stretch, usually by a few thousandths of an inch. The torque to yield bolts are considered "one and done". Loading So you can re-use the standard head bolts, but when it comes to torque to yield bolts, if they have reached plastic deformation, they need to be replaced with new ones. 8,4,2,6 Use a few drops of oil, or better, antisieze, on the threads and under the bolt heads. 1-16 of 460 results for "torque to yield bolts" Torque to Yield Gauge Torque Adapter. Bolts are inexpensive, though. We recently had a car in our shop that had a rebuilt engine but had been in a museum for 20 years. I imagine you can old torque them down so many times before they eventually stretch too much. Head Gasket Set & New Head Bolts compatible with 1987-96 Chevy GMC 5. Since the bolt has actually stretched, reuse to a torque value is unreliable. The head bolts are true torque to yield, but the main and rods are torque plus angle. If you are intending on making a lot of power, consider new or upgraded bolts/studs. when you torque them down the strech, so when you resuse them they strech more and are weaker head bolts are really only designed to be used once. Prior to disassembling I tested each bolt tightening torque in 5 foot pound increments. The newer Toyota engines use torque-to-yield bolts, the older ones do not. As for me, I'm going to get studs for the head. . They are designed for high HP applications, and can withstand multiple teardowns and rebuilds. Who is correct? What I did was to skip the torque to yield part of torturing. I chased all threads with a tap just to clean them up and remove any junk in them. If you're not going to be using a power adder or higher than stock compression ratio, feel free to reuse the stock bolts, and use Ford's torque specs. Anyway, measure the bolts to see if they stretched from the original tolerance. This means the fastener has been torqued to its elastic limit and will NOT return to its original length once the load has been removed from it. Stripped threads in the block are about the only issue I've seen. This is because it is nearly impossible to verify if a bolt has ever been tensioned past the yield point. Okay then, I apologize. Jun 26, 2008 · Like headbolts, you can reuse rod and main bolts assuming they are in good condition. I just didnt think I would need them , I've never had to replace them in the past. Aug 22, 2007 · There is a procedure for measuring the bolts to determine if they are reusable but its not likely you have the proper device to measure them. Once they reach this zone, they spring back to provide a more precise level of clamping force on the gasket. I believe you can download the specs on the bolts. I understand that a Torque to Yield (TTY) bolt can't be reused. The 20-22R head bolts are not torque to yield, and Toyota does not advise replacement evertime the head is removed. I personally use ARP studs for all of my performance builds. Aug 17, 2010 · Very doubtful. If you see any gap, don't reuse them. These bolts feature bolt heads that are specifically designed to stretch when assembled to provide strong, reliable clamping – especially valuable in critical assemblies where bolts that loosen can cause big problems. ARP bolts are pretty cheap, though Dec 23, 2012 · head bolts torque to yield, myth? When we put the new heads on my 300 we replaced the head bolts. Used Head Bolts Simple Test my best vids. Like anything , they fatigue with time , use and heat/cool cycles . The manual says that you can reuse them. 5RS at 09:44pm on Aug 02, 2012. Reusing Nuts'n'Bolts. You can use Loctite instead of ARP Ultra-Torque, but do not use them together. The "special tool" that you were told you'll need, which you will, is a torque-angle wrench. Just replace them to prevent any damage to it; if possible, head studs are better and are usually reuseable. Bolts will be torqued to 50 ft/lbs first, then torqued to 105 ft/lbs. By all means not the " right way" but it definitely worked for me. Each engine manufacturer offers guidelines as to whether torque-to-yield head bolts are reusable. Make sure all of the head bolts are in good condition, free from nicks or corrosion and are not stretched. If they have stretched at all then throw them away. When Can I Reuse My Head Bolts? Head bolts might seem like a minor or unimportant part, but without them, combustion wouldn't be possible and your engine wouldn't work. When using Loctite, make sure you assemble the parts before the Loctite cures. Oct 25, 2002 · Do yourself a favor, if your going to use stock head bolts, torque them exactly how the service manual specifies. The tip is to check the final amount of torque reading you get from them after you go through the final torque to yield angle. Apr 14, 2010 · I just got the special head job tool tool for a song, and ordered all the needed parts for the head job from fcpgroton . My Silverado in my sig got arp's when i put LS6 heads on her I went for them because its Procharged. The loss of clamping load could ultimately lead to head gasket failure. Since they aren't a torque to yield bolt, they can be re-used. Technician B says TTY bolts must always be replaced, never reused when reassembling. I had a lowly 1982 Ford Escort that had the "torque to yield" head bolts. And make sure you install the lift hook in the back of the engine. But neither the Haynes or Subaru manuals indicate that EA25 head bolts are TTY, and a new head bolt set is mighty pricey. At least thats what ARP has said. You can't really check the spec of the head bolts as it's a procedure, not an exact finishing torque. TTY bolts were introduced in some of the older engine designs in the early 1990's. Carefully guide the cylinder head into place over the dowel pins and gasket. Watching for movement, I then got an average torque for all and torqued in 3 steps to that averagedone no leaks. 9L engine, and although it's not a truck perhaps I can get some advice about it here. Many critical automotive fasteners ,such as cylinder head bolts ,are of a torque to yield design. 7/16 vs 1/2 Head bolts 401: Post Reply It is what it is and don't worry about it as AMC head bolts are below yield torque specs. 0 reg cab Does ford use torque to yield bolts on the flywheel ? Jan 20, 2007 · The only headbolts that are not reusable are torque-to-yield bolts. Be sure to mark them upon installation. The bolts are Torque to yield, basically when you torque a bolt you  Jun 17, 2014 I know they're not Torque to Yield, but opinions seem to be divided in the It would be nice to to have to spend another $85 on bolts if I don't  Manufacturers switched to TTY(Torque-to-Yield) bolts because they can be torqued less, so less distortion of cylinder bores when engine is  Sep 27, 2017 You can reuse torque to yield bolts it's common practice when doing warranty work. I don't understand why though. Check them for excess stretching at the threads and where the head meets the bolt shank. Conclusion. Feb 5, 2020 Consequently, No gasket is going to seal well if you use the. If you reuse the old bolts, DO NOT torque to specification, this would take them way past their maximum On newer (GM) vehicles, you are suppose to use new head bolts every time you remove the cylinder heads. Principally this is due to two sets of technologies existing side by side and often in the same engine. Most factory head bolts are TTY however. The only reason I am considering reusing the head bolts is because I need the car soon, but I can barrow a family member's car if need be while I wait for the bolts to arrive, if they need to be ordered. Just like to hear what everyone thinks. So, any bolts that are torque to yield can only Torque to yield bolts will stretch during final torquing upon install. If you torque to yield the first time using a torque wrench to see what torque was applied to get it to final position, you could get a good grasp on how much torque to apply when re-installing. Head bolts, as well as most of the bolts internal to the engine, are what are called stretch bolts (also known as torque-to-yield bolts). new rod bolts, bearing cap nuts, etc, or can I reuse the old ones? elongation of the bolt to push it into yield. Main bolts are alright to reuse, notice how you only torque them once. I used that as a learning tool and bought a set of ARPs ,cheap insurance if you ask me. The inital "snug" torque is simply there to settle I've re-used them many times in the past in factory rebuilds. Ref: Haynes Ford Mustang & Mecury Capri - Section 2D-12 #9 Dec 21, 2012 · head bolts torque to yield, myth? They showed me the parts they ordered and all they ordered was a gasket kit and the lifters. Get yourself a stretch gauge and the ARP grease with the money you save from not buying new bolts. I want to know whether or not it would be safe to reuse them. I might have an old hard copy I can take a pic of. If these huge bolts/nuts strip, I'd say your torque wrench is out of calibration. Never reuse (TTY) head bolts. Could someone tell me please why you must buy new bolts and can NOT reuse them? Never say never but, I have never seen any problem re-using head bolts many times. Skip to main content. So the point of all this besides educating you on fasteners, is that any bolt can be tightened with a torque-angle specification, but that does not mean that it necessarily is a TTY bolt. Sounds like the Miata headbolts are NOT torque to yield and would be ok to reuse, yeah? Correct. I know in the Bentley manuals and about every VW publication ever produced they say to replace all the hardware but I personally feel its for liability reasons not because the hardware needs Can i reuse ARP rod bolts? stock head bolts are torque to yield - use once only i figured they like the head bolts, but better to be 100% sure then to throw a Mar 17, 2011 · Can I use my f20a4 head bolts again? not use the torque to yield method so you can reuse the bolts, though you will want to inspect them to make sure they're in approaches the bolts’ elastic limit and the bolts are permanently stretched. That's what - about 27 years ago? :confused: If that's true Super 88, then I'm going to use the same old bolts again. where you torque to yeild head bolts are torque to 20 ft lbs then 90 degrese on all bolts, then an addtional 90 degrese on all bolts. Nov 27, 2011 · So, big giant head bolts, may be safe to re-use (unless the engine over heated in which case it is more likely the bolt was stretched beyond it’s yield point), smaller diameter head bolts (especially ones with a torque procedure that has you tighten, loosen, tighten, turn N degrees) should NEVER be re-used. These bolts will fail due to excessive torque. The stock M30 head bolts as used in E12 cars are not "stretch" head bolts like many of the newer BMW models have. Jan 17, 2018 · I wouldn't. 99 from them, if you want to compare their prices. I think "torque-to-yield" definition is that you snug them to a certain torque, then mark the head and turn a fixed angle (say 3/4 turn). Don't askit's what happens when you have a 2 yr old and an 8 yr old constantly asking, "What're you doing Daddy?" Also, you will need to discard the old bolts because they are "torque to yeild" bolts and CANNOT be reused. Butch/56sedandelivery. This data is provided by the engine manufacturer and should always be adhered to. Now that you have them tight drive for awhile and check to make sure they are all still tight. Also use moly lube, assembly libe, or simular and follow the latest torque instructions. I build engines for a living (mostly diesel) and that's right if the head bolts on the Stude look fine no reason not to re-use them. I've had one break and now all my engines use ARP rod bolts. ARP studs or bolts aren't the problem. Jul 04, 2016 · If you have to go back and re-torque the head bolts after installing the heads and gaskets, there’s a major flaw in the engine design. How can I tell if the one on the left is torque to yield? I have a 1995 gen 1 small block Chevy with a cast iron block and cast iron heads and for decades that combination used reusable head bolts. As long as they are not torque to yield I would say you could provably use them about 3 times total with no worries. The third pass would be another 90 degree angle. engines will change from using head bolts that are tensioned to a predetermined torque setting to the use of "torque to yield" head bolts. I've seen 30 year old GM head bolts used in high compression engines with no problems. Just double check your service manual for the torque spec. As long as they pass visual inspection, I see no reason not to reuse. Jan 15, 2004 · whoever tells you that you can reuse those TORQUE TO YIELD bolts is a meathead. Be sure that you DO NOT reuse stock "torque-to-yield" head bolts (if your engine originally came with them). Has anyone reused the factory head bolts and do you have any aditional thoughts on the 3 step torque proccess. Reusing head bolts may seem obvious, but it just might cause you more trouble. if you reuse them you can stretch them beyond their yield point causing the bolt to break. I THINK its 3 steps to 87 ft lbs, loosen and retorque. Never reuse TTY cylinder head or main bearing bolts. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused. Additionally, because these are TC bolts (I assume button head), and the spline has already snapped off, that adds a layer of difficulty due to the fact that you will have a hard time holding the head still when re-tightening. I would Re: The theory behind torque to yield head bolts Post by wjhandy850 » 20 Apr 2011, 22:25 I had a independant volvo used parts source tell me that I could reuse my bolts when I bought a rebuilt head from them. MOST TTY head bolts don't just torque to a value (ex. They are designed to be installed once and only once. If you try to use them again, they will fail. a video about tty head bolts and mls head gaskets. Head bolts are TTY (torque to Yield) meaning they are slightly streached when they are tightened down. you are never supposed to reuse torque to yield bolts over. They shouldn't be used again because they're already stretched and won't give you the proper torque the second time around. Also, you only torque them to 74 in-lbs max Your heads are 90 ft-lbs or 1080 in-lbs. And before someone posts up the that's how my builder does it story or I've done it several times. That means they are designed to stretch one time when they are installed. You should always replace the bolts. Dec 09, 2010 · Most head bolts are torque to yeild so they are throw aways, if you reuse them, you can warp a head, have coolant leaks, loose compression, all kinds of things. In suspension components there are some bushings where the bolt must be torqued properly. Because you are supposed to buy a tap to clean the threads inside the engine block where the head bolts go, just compare the bolt threads with the tap threads by making contact with each other. The original bolts appear to be standard bolts and I am wondering if I can reuse them. How are they different? Can they be reused or do they need to be replaced? I would like to clarify some issues regarding these types of bolts now commonly in use in the automotive industry. CAUTION: Ensure that the total “re-tightening angle” [in the former two steps], do not exceed 180°. The intake manifold, rocker arm, and rear cover bolts can be reused. All that's really important is getting the proper tightening sequence and tighten each bolt a little at a time. Scott Sounds like he was agreeing with you. I wouldnt reuse. hey guys, are the cylinder head bolts "yeild to torque" bolts? the reason i ask is because i see in my clymers manual, that it states to torque to 22ft-lbs in 2 stages first, then loosen/remove, then re-lube bolts, then torque to 15ft-lbs in 2 stages and then make and reference mark on the head Amazon. Because they stretch is the main reason one should not re-use them. If spec is 190, move it down to 170 or 180. but, if your engine is prone to overheating then you need to beef up your radiator and set your default temp lower. I think you can find people out there with all different experiences. I would get some good aftermarket ones like ARP. Removing the bolts while the engine is hot can cause cylinder head warpage. It's been a while since I've taken mechanics of metals class, but iirc metals get stronger in the yielding section of their strength. If you are unsure if your fasteners can be reused, contact the FEDS department and we will provide assistance. You can reuse the bolts. Wondering if they can be reused or not, local auto part stores dont seem to carry them. I have heard of TTY, or torque to yield bolts. 5. The bolts in the Duratech 24V are torque-to-yield, but not specifically called torque-to-yield for the Vulcan 12V. They hold your cylinder head to the engine block and help the head gasket to seal properly. Normally you don't "torque" an intake anyway. The only bolts that need to be replaced, generally, are TTY or torque to yield head bolts. End of the day, maybe most people feel safer with new bolts. If you are considering reusing stretch bolts, read this first: If you remove any torque to yield bolts (Stretch bolts), you SHOULD replace them with new bolts and torque to specification. Nov 27, 2018 · Once the gasket is crushed down during the torque procedure, it will no longer seal properly or at all if installed again and torqued to the same spec. 7L or are they TTY - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. Never used on the 351W or 460, as far as I know. Have any of you reused the head or main bearing bolts? Also, if you know of a good brand/source for bolts, please share. reusing head bolts I have always been under the impression that head bolts were not reuseable due to stretch, but I have been told I can reuse the head bolts when I put my heads onto the new SB. I have seen it posted that U-bolts are actually "torque to yield" fasteners. It claims that the head and main bolts have "unlimited reuse", and I'm a skeptic - I've always thought that head, rod, and main bolts absolutely must be replaced. Thoughts ? Jan 27, 2016 · The OEM bolts are good stuff, not like the throw away torque to yield stuff which have their purpose. Install the cylinder head bolt finger tight. I think that on an engine that is not going to see any kind of extreme duty, you can get away with recycling the head bolts. Torque-to-yield bolts also have a spec for length, once the length is exceeded, you cannot re-use. Tighten the medium bolts (12,13) 65 degrees. The reasons behind the change are: You should use new head bolts on this engine, Jim. the cost of potential failure (including human cost - risk of injury or loss of life). 5 and have the large washer integral with the bolt now. Read the link posted below it will help you to understand. Stretched bolts can damage threads in the engine, especially on aluminum blocks, and since the bolts are weakened, they may break if retorqued. So you can re-use the standard head bolts, but when it comes to torque to yield bolts, if they have reached plastic deformation, they need to be replaced with new ones. Threads contaminated by trace amounts of debris, antifreeze or oil will cause the bolts to creak or snap while being tightened. of go directly to honda. You can help Wikipedia by expanding it. unless they're Torque-To-Yield ( aluminum heads and Diesel heads typically ) , you're probably okay . That is the difference between a bolt and torque to yield. If you have the AUTO transmission, you probably can't do this. Cylinder pressure in diesel is essentially what makes the power. Fel-Pro ES 71028 Cylinder Head Bolt Set. I've had the same head bolts through two rebuilds and bore jobs with no issues. Last truck we did head work to had over 20K hours and we re-used the bolts. I found out the hard way, when I had change the thermostat. Who is right? FWIW, I just finished a head May 22, 2018 · Can I reuse the bolts to the rod bearing cap to a 2002 Dodge Durango with a 4. You can usaully tell by the torque rating whether this is true or not. A torque to yield fastener (TTY) or stretch bolt is a fastener which is torqued beyond the state of depending on the load frequency and amplitude, can significantly increase the fatigue risk of fatigue related failure, like a bolted down cylinder head, to use torque to yield bolts. If the heads are removed, new bolts should be used to ensure proper load. There is nothing wrong with reusing REGULAR head bolts. A lot of engines use single use stretch(aka "torque to yield") bolts. Jan 09, 2009 · In 2006 I had my 1995 Chevrolet Cavalier's head gasket replaced. May 21, 2015 · Simple home test to help you decide if you will reuse head bolts. You have to phisicly inspect the bolts first. Question(s) about Torque-to-yield bolts (engine rod bolts) You will have to register or login (See top or bottom of page) before you can post a message or view images: click the appropriate link to proceed. Most VW/Audi fasteners/bolts are not TTY (torque to yield) Beyond what VW/Audi technical publications claim most of the bolts are not torque to yield. Aug 19, 2016 I've also heard that you're not supposed to reuse these bolts. Re: Do you reuse head bolts? Use whichever bolts you like, but I don't see what you'd gain by running the older bolts if all else is equal. The worry isn't that the bolts are going to loosen but that your not going to get enough clamping force from them. Why shouldn't torque-to-yield head bolts be re-used Torque-to-yield (TTY) head bolts are designed to stretch when used. The reason: "Torque to yeild" bolts actually stretch during the torque process and once they've gone through this process they can't be reused because they no longer are able to "clamp" the head because they are too long. rod kits sum cr4058098 damage alert how to avoid pulling thre or killing head bolts GM is now recommending a torque turn method of tightening the cylinder head for this engine. May 07, 2019 · There's a lot of engineering science that goes into clamping two components together. Reuse of Fasteners Mechanically, bolts may be reused provided the bolt never exceeded its yield point: a simple enough definition, but one that is more complicated than it may appear. I have reused head bolts for years unless they are rusted, and then I replace them with used ones! In todays world of fancy engines, almost ever engine uses torque to yield headbolts The first time I changed the heads on my car I was told that you could reuse the head bolts also,but one broke off in the block on me during the final torque sequence. For example, you may torque to 60 ft/lb, then turn an additional 90 degrees. these are called torque to yield bolts, and yes they are expensive, i have no idea if subaru uses these but i have Torque to yield is when you tighten a bolt beyond it's yield point. Once stretched, they are not as strong as before. Oct 19, 2009 · Head Bolts strecth? and torque spec for Head bolts on 4g64 If this is your first visit, be sure to check out the FAQ by clicking the link above. What a pain in the butt getting it out ,never mind the cost of the extra gaskets. 60 ft/lb). If they do not snap, the already permanently stretched bolts will stretch even further and rapidly lose clamping load. You have to weight the cost of replacing a fastener during service vs. A lot of guys will say Summit, or JEGS, but I say Competition Products. The guy I used to put it on didn't flench either. When you take apart or replace these components, you shouldn't ignore your head bolts. plus 1/2 a turn then they are stretch bolts and should not be reused. Coat the threads of the cylinder head bolts with sealing compound GM P/N 12346004 or the equivalent. 0 out of 5 stars 1. You will be fine. Conventional head bolts simply did not wear out. Many mechanics reuse them on the M30 engine, as do I when I normally re-install a new head. The vertical main bolts can also be re-used, but the side bolts are often replaced because they have sealant on them. You should always replace the T-T-Y bolts; these bolts are designed to stretch, and reusing them will cause improper, uneven torque and clamping force. Head bolts stretch and even if the threads look good, the bolts themselves may not actually be good. They are torque to yield and should be torqued to 65 ft lbs initial torque + 90 degrees. This quick test will show bent and stretched bolts. The bolts are plastically deformed when they go into yield, typically you can reuse them 1 to 2 more times. Mar 06, 2006 · Torque - to - Yield as the title says, they are designed to be tightened once, I'll goo get a definition. Re: Do you reuse head bolts? I reuse head bolts on sbc that is a stock rebuild. May 14, 2012 · The head and block design obviously matters, but the fastener can usually be specified either as a torque-to-yield fastener, or a standard one. Jan 05, 2020 · Can You Reuse Ls Rod Bolts. In theory you'd need to torque it tighter to crush it more to seal. What I mean exactly is that, if you have an engine where you plan to take the heads off regularly, like a race engine, you can often buy ARP head studs that will last many cycles, and replace OEM torque Can I reuse block bolts/head bolts I am rebuilding my motor and I was wondering if I could reuse the bolts that hold my block together and my head bolts, or are they torque to yield? I am assuming that the head bolts will have to be reused but I am not really sure on the bolts for the block. Max, yes you can reuse the stock head bolts, however I would not recommend reusing them more than once. I did one of these cars about a year ago, and replaced the TTY head bolts and had the head reconditioned at a shop. If it's getting worked over then i will pop for the arp's. Since T-T-Y bolts are designed to stretch, reusing them can cause improper or uneven torque and clamping force. Do NOT use Loctite on the nuts for the head studs or main studs. ARP makes head bolts that can be re-used along with rod bolts. Bottom line: it's okay to re-use 4A-G head bolts, crank bolts, rod bolts, etc. They must be replaced once they have been removed. I think "torque to yield" bolts came along later. Smith The Truth Behind Torque To Yield. Torque-to-Yield (TTY) head bolts are used on several late model engines to clamp the cylinder head on the block. This is how I know if threads are stretched. Torque-to-Yield bolts (TTY), should not be used more than once, because,  There is a lot of controversy about torque to yield head bolts, also known as angle torque, torque to turn How are they different? Can they be reused or do they. Nov 29, 2011 · Someone will correct me if I'm wrong, but I believe you can reuse the old head bolts. Some guidelines allow Do not place oil or threadlocker on the bolts. The 2nd article Kevin linked mentions LS chevy engines. Chase the holes and clean the bolts and lube the threads. If you try to reuse them, you will not achieve the correct clamping I've always reused old head bolts unless they are TTY (torque to yield) type. And yet another paragraph: It is very important to 4 Cylinder Engines - Reusing Torque to yield bolts - I will be replacing a head gasket on another Escort 1. Do it right and get new Our cars are NOT torque to yield! You can reuse them if they look alright. Skip navigation torque to yield head bolts, reuse or not? dave1135. If there is no paint on them they can be reused. I believe that the head bolts that are available now are also updated for that era of 2. Tighten the long bolts (1, 4, 8, 5, 9 ) 75 degrees. That transmission is temp controlled. 3. Using Torque to Yield Bolts . Those holes are machined shallow to allow for it and if you leave it out the bolts can hit bottom. GM LS engine head bolts, for example, are TTY fasteners that can only be used  Jan 28, 2017 A fastener with a torque specification can be tightened with a with more than one fastener, such as wheel nuts or cylinder head bolts, the  How to Install Torque-to-yield (T-t-y) Bolts If removed and reused, it is likely that either the head gasket will fail (due to low clamp load) or the bolts will break. then they can be reused, but if it says torque to 72ft lbs. It also seems there may be some misconceptions regarding U-bolts on the net. They may hold for some but I have had some break when they were reused. Com, "SBC performance head bolts $19. But I would not over torque the head bolts to do that. When changing gaskets can you reuse original head bolts? I'm installing new head gaskets and want to know if I can use the same head bolts or do I need to get new bolts. ARP bolts will eventually over stretch with repeated tightening and need to be replaced but since this is only your first removal, you will be fine. I understand they are suppose to stretch, but why can't you reuse them? If they stretch past their elastic limit (or whatever it is called) wouldn't they be no good even when new? Reusing head bolts on your engine is not usually recommended by dealerships and car manufacturers. However, Torque To Yield is exactly that: the bolt is torqued until it "yields". They usually torque to a value, then an additional amount. You are not supposed to see any gaps between threads. Aren't they supposed to be replaced when you put the head back on? Is that why my head gasket is leaking two years later? Can I fix it by re-torquing them? Would it be monumentally stupid to try to torque just the half that are outside of the valve cover Jul 12, 2011 · Head bolts are typically a Torque Angle to Yield specification, an example 100NM plus 75 to 100 Degrees of angle. Make sure the torque specifications you are using are the latest, up-to-date numbers. The design of these head bolts is a "new secret"? The last car I worked on that you could reuse the head bolts was from the mid 70's. If you want a set. If these bolts are removed and reused, it is likely that either the head gasket will fail due to false torque readings or that the bolts may break. I have always re-used them at least 3-4 times befor replacing them (usually with used ones from a virgin motor). I did that but when the new bolts arrived they didn't look any different from the old ones, I checked everything, thread, consistency, etc. Toss in today’s common rail injection sequences and factory torque-to-yield head bolts, and you can see why cranking up the power can pop a head gasket, or worse. When I replaced my heads, I just went with replacement OEM head bolts from the dealership. Tighten the cylinder head bolts on the first pass in sequence to 30 N·m (22 lb ft). When reinstalling the head the manufacturer's recommendation is to replace the bolts. It states that rod bolts must be replaced. I've read a lot about bolt stretch and fatigue, torque to yield, etc. Use the J 36660-A in order to tighten the cylinder head bolts on the final pass in sequence: Tighten Tighten the short bolts (11, 7, 3, 2, 6, 10) 55 degrees. so you SHOULD REALLY get new ones Jun 24, 2009 · Install the cylinder head. But that's just my thoughts and opinions. They are not torque to yield type. So, Typical bolts can be an issue when you use them on aluminum heads and with a gasket that doesn’t relax, like an (MLS) gasket. Sep 26, 2012 · I believe these are torque to yield bolts and the specs are: Initial torque to 19 Ft/Lbs Tighten an additional 75 degrees It's also not a good idea to reuse these bolts as they are stretched when May 24, 2016 · Many of the bolts used in machine assembly, such as the automotive industry, used what are called “torque-to-yield” (TTY) bolts. While I don't always use new head bolts - I ALWAYS upgrade the rod bolts. He has an interesting story but he doesn't explain why not to re-use "torque to yield" head bolts. No gasket is going to seal well if you use the wrong procedure to tighten the head bolts. Since the common introduction of torque to yield bolts, confusion has arisen, especially in regard to their reuse and as to when and if they can be re-torqued. In my BMW, the head bolts were "torque to yield" and got stretched out every time you tightened them so new head bolts every time the head came off. Now they want to sell me the TTY bolts but I want to reuse the factory head bolts assuming they are standard bolts and not TTY. From what I'm seeing - and it makes perfect sense. If you know metallurgy, tough metal like in bolts increases in tension as it yields until the diameter starts to neck down appreciably. Viper94, I know you have a gen1, I just want to make sure nobody gets confused and causes themself a lot of unnecessary trouble. In essence, you stretch the bolt. These are the bolts that you reuse over and over without any problems. Many were designed for single time use (torque-to-yield). Nowhere in a VW repair manual does it specifically state that you can reuse head bolts, except in an '85 diesel motor. When a bolt comes under load, it exhibits four main phases: the elastic phase, the plastic phase, the yield point and the shear point. Why Use Torque To Yield Fel-Pro offers replacement head bolts for T-T-Y that are application-specific. asked in Engine and Engine Management / Misc about a 2002 Impreza 2. At another thread, one person who claimed to work for a spring shop said that they reuse U-bolts as a common practice. This is basically a scenario with the manufacturer has selected a fastener which is torqued down Jul 09, 2019 · Torque To Yield Bolts – Important Tip ! Before removing torque to yield bolts, allow the engine to fully cool. It's too easy to just throw a new set of ARP bolts (or studs) in there and forget about 'em (and it's cheaper and easier than doing the job again). Torque-to-Yield Head Bolts Torque to yield head bolts are also tightened in a series of stages a nd in sequence however, they are not tightened to a predetermined torque , they are tightened through a series of specified angles. Dec 09, 2010 · If the bolts have a dab of paint on them, they have been removed before and should be replaced. Torque to yield is a good way to get a more accurate clamping force. Like a spring, bolts can stretch a certain amount and still return to their original length. Tester I think the difference is more from assembly. Hence the recommendation from Audi; I imagine they are NOT TTY. You never reuse torque to yeild bolts, never. Cheap insurance, to me rod bolts are the most important to replace seeing how they're under extreme stress and a failure can completely destroy a motor. 2 years and 22,000 miles later , I've had no problems . 0L engines. Never reuse torque to yield (TTY) head bolts because, if you do it's not unusual  A fastener with a torque specification can be tightened with a conventional one fastener, such as wheel nuts or cylinder head bolts, the fasteners should be  Nov 25, 2005 Honda head bolts are not torque to yield and are reusable - i have been "How to Identify an Engine with Torque-To-Yield Head Bolts? Reusing head bolts on your engine is not usually recommended by mechanical work to the head assembly, you can reuse your head bolts if they Because of the intense heat that the head is in, the bolts will occasionally fail when torque is  From what I understand Toyota does not advise reusing the head bolts. However, when you change your head gasket, or do other mechanical work to the head assembly, you can reuse your head bolts if they are in good condition and you follow a few tips. Do not tighten bolts more than 90°. The stretch is built into the design, and is made for heat expansion and contraction of dissimilar metals. This is because during the torquing process, they are stretched beyond deformation, past their plasticity. Felpro indicates the EA25 bolts are TTY and cant be used. 130 pounds on a standard length torque wrench barely feels like anything. I am not aware of any factory Windsor using 'Torque to yield head bolts'. Jul 20, 2005 · These are the bolts that you reuse over and over without any problems. torque-to-yield bolts stretch to the appropriate torque value. Hi Waterwheels. The mechanic re-used the head bolts, but they are torque-to-yield bolts. Stretch bolt theory, torque to yield bolt theory, in a nutshell If its a torque to yield application, then certainly reuse of the bolts would be a bad idea. In all reality the likely hood of the torque being incorrect causing damage to a mount is borderline ridiculous. except I didnt order bolts. Tighten Tighten the cylinder head bolts in sequence on the first pass to 30 N·m (22 lb ft). It states the head bolts can't be reused, but rod and main bolts can. You may have to register before you can post: click the register link above to proceed. That is why I only use ARP bolts. If not where can i aquire some? 96 ranger v6 4. Based on engineering principles, I would guess that when you first torque the bolt you take it into the inelastic range, and in effect "use up" part of the inelastic deformation available. 95, American made and Teflon coated". They are not subjected to the abuse rod or main bolts are, and therefore almost never fail. -TAG This is very old data but you get the idea from it at least. And there are several variables that lead to increased pressure, such as adding more fuel and boost. Ian So are you talking about cylinder head bolts or engine or transmission mount bolts? If its just mounts who cares, reuse them. If you reuse them, not only will they fail, but you will most likely cause damage to the head due to warpage. Please also know you can also more then likely reuse your all your gaskets , rings, & seals. Mar 12, 2008 · use new bolts, head bolts stretch when torqued properly giving proper clearance and pressure, when removed they do not stretch back so the torque you put on them will not yield the same compression force on the head and gasket. TORQUE TO YIELD HEAD BOLTS There is a lot of controversy about torque to yield head bolts, also known as angle torque, torque to turn, wasted or stretch bolts. thanks. The stock rods are weak and usually break just above the large radius (no aftermarket (ARP) bolt will stop it) If the rods are out, you should replace them with Compstar or equivalent/better; if you can afford it. The 3 things I always replace in any type of performance motor is rod, head and main bolts. Based on mine, and also considering that I don't want to deal with a head leak later, I would recommend replacing 7/16 head bolts that have been reused for a few rebuilds. So you see, you can do as you like. I used my Haynes manual as a reference before I posted. Torque is torque. Apr 13, 2010 · @Adrian- The AISC/RCSC says that A490 bolts do not have sufficient ductility to undergo more than one pretension and shall not ever be reused. This happens when you tighten to a torque value and the add some angle, in most cases another 1/4 turn or 90 degrees. The balancer bolt is also a torque-to-yield fastener. There's a reason they're so spendy On head gaskets, you have to make sure that both mating surfaces are flat- otherwise, you'll puke head haskets all day long, especially in a turbocharged application. Re-use of Fasteners and Torque In the event that a fastener is reused, attention must be given to the method of reinstalling the fastener. Mar 17, 2017 · The connecting rod bolts are also TTY, but can be tightened up to three times for bearing checking. Nov 27, 2012 · Cummins does make a "stretch gauge" for head bolts. Torque in the following pattern, looking at the head from the exhaust side: 7,3,1,5. Always ensure that the threads are clean prior to applying any lube. The engine uses "torque to yield" bolts that require torquing to a certain foot-pound amount, then turning it a certain number of degrees beyond that. To date I have had no problems either on 2002's or the ole' big six engined BMW's I own. Aug 19, 2016 · GM LS engine head bolts, for example, are TTY fasteners that can only be used once. 5 out of 5 stars 46. I read everywhere that you must buy new bolts when you install the cylinder head. If the book says torque to 72ft lbs. You can get most ANY kind of engine part, and be dollars ahead with them. From what i found on the internet torque to yeild is where you for instance do 20 ft-lbs on the rods, then an additnal 40 degrese. Stretched bolts can yield in the threaded portion or the shank portion. TTY head bolts are designed to stretch within a controlled yield zone when used. But woud you? Dec 17, 2014 · In any case, as long as the bolts are not 'Torque to yield' bolts you can generally reuse the bolts as long as they measure to the original length. You can re-use some head bolts as well, just not torque-to-yield bolts. Unlike a Cheby you can reuse Feb 08, 2013 · Torque-To-Yield Cylinder Head Bolt Installation and Removal Recommendations February 8, 2013 · by adolpheer · Bookmark the permalink . I know of no other vehicle manufacturer that requires re-torquing of the head bolts once they’re torqued to spec. The head bolts are torque to yield bolts and should not be reused. 7 350 VIN-K TBI. To me it really  Feb 7, 2017 A fastener with a torque specification can be tightened with a more than one fastener, such as wheel nuts or cylinder head bolts, the fasteners  Sep 27, 2012 I never reuse any "torque to yield" bolts, but we only have one of I can get a set of head bolts for a domestic V8 automotive engine for 30  May 19, 2017 TTY fasteners can only be used once because once they have been stretched to When a TTY head bolt is installed, the torque value and twist angle But if a TTY bolt is removed and reused a second time, the additional . torque to yield bolts (all 12 point VW head bolts) are called strech because they do-and just like an elastic band, when steched, they return to length (pretty much-more about that later). Jan 04, 2012 · Auto Tech: Torque-to-yield bolts by Chris Chase - January 4, 2012 Three torque-to-yield bolts: the one on the left has been tightened to its normal limit once; the middle bolt has been torqued a second time, and the bolt on the right shows what typically happens to a torque-to-yield bolt that is tightened more than once. When discussing cylinder head removal and installation, Technician A says torque-to-yield (TTY) bolts are used to attach cylinder heads in all automotive engines. All bolts stretch. You should replace them after 6-7 head removals if you torque to manufacturers specs. When it said to make sure the head bolts went back into the same locations that they came out of I was sure they were reusable. I'm thinking beam type here, not a clicker. Having said that, I'd bet that 75% of the engine rebuilds are done with used head bolts. Not tourt to yeild like the head bolts in an alunmun motor. The bolts don't look like torque to yield, they appear to be all standard place bolts so, it's fine to reuse them, as long as you torque them properly. When i asked why they werent replacing the head bolts the service manager said that the service manual doesnt call for even an inspection of the headbolts. Can you reuse head bolts on a 1997 Kia? I need to know the timing marks for when I put both the cam shafts back on and the head torque specifications for a 1997 KIA Sportage, two wheel drive. Thanks. (7) Further tighten all bolts by 80 to 90° in alphabetical sequence. They're both usually called torque to yield. Upgrade your ride from bias to radial tires and learn how to build your own beadlock rim for your 4x4. It does not however, use a torque-to-yield bolt to mount the cylinder heads. Used TTY (Torque-To-Yield) head bolts will snap in the process of re-torqueing the cylinder head. Many say that you shouldn't reuse head bolts unless you're using ARP or equivalent, while others say that it's OK to reuse, as long as your not building anything fancy (which I'm not). I reused the head bolts on my 1972 Coronet's stock318 ( replaced the blown head gaskets ) ; I also reused the rocker shafts' bolts . The cylinder head mounting bolts may be reused if they are not damaged in the threads or show neck-down or stretch condition. The factory service manual warns in bolt letters to never re-use the head bolts for either of the 3. Me personally I would never reuse a VG30's head bolts as they have been known to snap the heads off and wedge under the cam lobe destroying the timing belt and possibly bend valves. Mar 25, 2016 · a video about tty head bolts and mls head gaskets. Torque to yield head bolts however, by the very nature of their design do deteriorate and should never be reused. Whatever you decide, the torque spec matches the bolt and if you're doing the torque-angle method use the bolts out of the '97. At this point the bolt has changed its form and if loosened or removed it must be replaced with a new torque to yield bolt. That being said, it really depends on the application. A more accurate method for tightening head bolts to the desired torque was needed, which is why torque-to-yield (TTY) bolts were introduced about 30 years ago. Do you think tightening the bolts is going to solve a leaking head gasket, or are you replacing the head gasket? These are "torque-to-yield" head bolts. P/N 3823921 is for B & C engines From the Cummins Tool Catalogue: These templates are designed especially to measure the free length (stretch) of the used cylinder head capscrews that have been used in the torque plus angle tightening method prior to installing in the cylinder head. When once a bolt yields it passes the point of which it can return to its original length, like stretching a 4 inch travel spring 5 inches, it's permanently deformed and loses a great Jun 26, 2007 · Apparently the threads will wear into each other. Upon reuse, a nut and bolt combination will require an increased torque value to reach the Torque to yield stretched the bolt beyond what it can recover from. As the name would imply as you tighten TTY bolts to given torque numbers you have placed that bolt in the yielding section of its strength. In any performance rebuild I do, I prefer to buy new ARP bolts. The cylinder heads fastened with Torque To Yield (TTY) fasteners should be treated with some caution (or, at least, less caution thrown to the wind). I attach a few excerpts from a few manuals I have in my possession from VW, Ford, Toyota and Peugeot. can you reuse torque to yield head bolts