fastenating....

@TreyCook21

5 жыл бұрын

Eh, but only to a certain degree

@panzerveps

5 жыл бұрын

Get out.

@michaelmiller4716

5 жыл бұрын

OUCH!

@coreyscarrepairs

5 жыл бұрын

haha

Your explanation of torque to yield and it's purpose is the simplest and most logical I have seen on KZread. I understand why I need to use fresh bolts

@Bodragon

4 жыл бұрын

Or, if you don't have access to new bolts, how about re-tempering your existing bolts ? Could this work ? Get a whole new "stretch" out of them. >

You actually produce intelligent content for the automotive community..... I learned from this video.... you learned producing it. I appreciate that.

Having the auto captions on. tortilla bolts 😂

@mikedrz

5 жыл бұрын

I was hearing that too. Haha Torque to yeild doesnt really slip off the tongue well.

@ilikeboost4764

5 жыл бұрын

😂

@HUBBABUBBADOOPYDOOP

5 жыл бұрын

HECHO EN MEXICO

@iplaysdrums

5 жыл бұрын

My Honda actually was manufactured in Mexico, so I guess this checks out?

@timewa851

5 жыл бұрын

well now the CC says 'torque to yield' but when I hear eric he keeps saying tortilla bolts so thanks so very much pass the salsa. : (

You're spot on with how TTY bolts work and how lube affects final torque. I was in aviation for 20 years and there's a ton of TTY bolts out there. Also, when I went to work in a Honda dealership, I invested in a digital torque wrench that does ft/lbs and angles. So worth the money. Great video as always, keep up the awesome work!

@fisherofmenmatt4194

5 жыл бұрын

Michael Gozdanovic you were an aircraft mechanic for 20 years then automotive? What made you wanna change? Just curious

@Jacksonkellyfreak

5 жыл бұрын

Probably got sick of being crammed in tight spaces or all the hazardous chemicals we use. In the automotive world the chemicals aren't that bad, but in aviation, which is 50 years behind the rest of the world, we're still using toluene to remove CIC, which is corrosion inhibiting compound, and the CIC itself is extremely toxic. Cor-ban, Kry-tox lube (tox is in the name, super nasty stuff) Alodine, Skydrol eats skin, etc. People leave this industry every day.

@TheLeZura

5 жыл бұрын

Jacksonkellyfreak hit a lot of very good points. Personally it was just a wicked case of burnout. I needed a change and having a much better time now doing other things. I've had offers to go back to aviation and I just can't make myself do it. I think that's a part of my life that is best left in the past.

@arc00ta

5 жыл бұрын

Always wash your hands BEFORE you go to the bathroom after using Skydrol!!! You only make that mistake once.

@sienile

5 жыл бұрын

@@arc00ta - Some industrial brake cleaners will give you the chemical clap too. Always wash off any chemicals before handling Mr. Happy.

The way I was taught, fastener torque is just an approximation of clamping force, taking into account thread friction, thread pitch, bolt diameter, etc. That's why on critical applications, the manufacturer spells out if the threads should be lubricated, as that's the only variable left that the installer can influence that will change the clamping force. Add a lubricant and reduce the friction of the threads, and the same torque can result in a _lot_ more clamping force (which can result in ruined head gaskets, warped brake discs, etc.)

@petermescher332

5 жыл бұрын

To emphasize, *only* lubricate if the service manual says to. If it says nothing, it's a safe assumption that it meant "clean, dry threads".

@Quantris

5 жыл бұрын

Yes. We use torque because it is what we can measure with the wrench.

Excellent vid. I really like the information. You have stated a few times that the TTY bolts are elastic. They are in fact experiencing a plastic deformation and are now permanently deformed; plastic deformation. Elastic bolts would spring back to their original shape and are therefore not TTY bolts.

It is best to follow the prescribed procedure for tightening fasteners. That being said, usually I run the torque pattern right up until it recommends the final tension angle. Stop, go back and verify all the bolts are torqued properly up to that point, and then proceed with the final tension angle. This ensures all bolts are ready to have the final tension angle applied. The way I think of it is the bolts are acting like a straight spring. That spring needs to have the proper preload so it behaves like a spring rather than a bottomed out or topped out spring etc. Springs are rated in force per distance. That needs to be correct for the clamping force to be correct and consistently applied.

@ETCG1

5 жыл бұрын

Well said!

@pennyparker6025

5 жыл бұрын

Here's a question... I'm installing a tention pulley on a e90 I torqed step one without realizing there was a step 2, step 2 bring angle torque. Can I reuse this bolt safely to do the proper 2 step torque

I learned something. That is a good thing. Only problem for me is, I have learned a lot over the years but still fail to apply what I've learned in too many cases. Sort of like using a regular wrench instead of a torque wrench. 12 pounds of torque = not very tight. 30 pounds of torque = pretty tight. 100 (or more) pounds of torque = use the long wrench and go for it. LOL. Thanks for the video! Stay dirty!

@ETCG1

5 жыл бұрын

Yea, that didn't work so well for me when I tightened the crank bolt on the Mini the first time. 😉

The real problem with degreeing fasteners is that if you get out of order or loose where you were you can't just recheck it like you can with torque. You go another 90 because you lost count you are going to snap off a bolt. What I have started doing it marking a line down the side of the bolt and onto the component with a paint marker. Then I can see if I turned it or not. It is also handy for visually seeing if it is 90 degrees. Still need a meter for those 30 and 60 degree turns though.

@ETCG1

5 жыл бұрын

Excellent idea. In fact, they follow a similar procedure at the factory.

@spacecat7247

5 жыл бұрын

FrugalPrepper's Garage & Garden I notice that from the factory also. More commonly now than before

@frugalprepper

5 жыл бұрын

I did that on my last rebuild (a GM Quad 4), because every single bolt on that thing had a angle spec, even the ones that wern't torque to yield. I get distracted trying to make sure the camera is going and getting the right shot and then loose my place.

@panzerveps

5 жыл бұрын

30, 45 and 60 degree turns are easy. 1/3, 1/2 and 2/3 of a quarter turn. Been in the trade for 10 years now, and still haven't had a single problem with eyeballing the degrees on TTY-bolts.

@justincurry1998

5 жыл бұрын

With a 6 point bold 60 degrees is one flat and 30 is half a flat

Terrific channel . . . I first encountered "bolt tensioning" only a few years ago with a new employer involved in industrial bolting applications. Most of us are accustomed to using torque as a proxy for tension but Eric explains well some of the pitfalls with that approach. The ultimate aim, of course, is to place the fastened components under _compression_ , this force being balanced by the _tension_ on the fastener.

What I was always told about TTY bolts is if the threads are ok and u can thread it down easily your probably ok to reuse,I've always applied this method on my own projects

This is very handy to know, and kinda reassuring to know that these bolts are made to handle it. I never like the thought of overdoing it and snapping a fastener.

I have reused the old bolts several times on many types of engines that did say to replace the bolts but in the Caribbean is is a little harder to get these replacement parts unless you wanna wait for 2-3 delivery and and extra cost that the customer most of the time doesn't want to pay for even tho it is his engine and have found that only once have bolts snapped when retorqueing them what I do may be crazy but when there are torqur to yield bolts I skip the step in the torque process at the beginning were they tell you to torque to a certain amount and then slacken that step is what stretches the new bolts so when Reuseing bolts I skip that step and just go for the next step..now newer head gaskets come sometimes with very low torque values and only angle values after with that I just add on more torque that I believe from the feel of the bolt that the bolt can handle and torque it down most engine call for Max 80 ft-lbs at Max and more only if you use head studs so between 50-70 ft-lbs on most import cars and euro is good enough to hold that head down on a non boosted application and sometimes even boosted as in diesel trucks they use 40-60 ft-lbs I have doing this for over ten years and never had to pull off a head from over torque or lack of compression but it is a feel of the bolt more than anything and that takes experience

@MrHBSoftware

5 жыл бұрын

when reusing some expensive tty bolts most mechanics around here tell the customer to drive around 500 to 1000km and go back to the shop to remove the valve cover and retorque the bolts. the head gasket after some heat cycles will become compressed to its final thickness and fastening after that often does the trick to provide a reliable seal.

@arm2644

4 жыл бұрын

So what step do you skip when reusing torque to yield bolts? You skip the torque to xxx step or the 1st 90 degree step or the 2nd 90 degree step? It is not clear on your comment.

As I understand it, torque specs are based on clean bolts and threads. If they have any kind of lubricant, you will be over torquing, if they are dirty/rusty, you will be under torquing.

@lsucowboy

5 жыл бұрын

It depends on the application. There is no dead set rule. If the application calls for lube, use it. And don't deviate from the type of lube they call for. More important than lubing threads though is lubing the seating surface of the nut or bolt. That's where the most friction happens when torquing. In industrial settings on critical components, tensioning is often used instead or torquing. Tensioning stretches the bolt to the correct yield and then the nut is hand tightened.

@Patrick94GSR

5 жыл бұрын

Honda dead bolts use stepped torque values and call for engine oil applied to the head bolt threads and underneath the head of the bolt between it and the washer. I'm not sure if those are necessarily TTY bolts, but Honda does say to replace them. When I did my Integra head gasket I had to do something like 20 ft-lb, then 50, and then the final torque value.

As a side note large diesel engines had torque and turn specs. It was not that the fasteners were replaced.It was that it's hard to pull 375 ftlbs 24 times in a tight spot. So they gave an initial torque say of 85 ftlbs and then turn 120 degrees more. How you achieved the extra rotation was up to you.

The actual reason these are used is because the relationship between torque and tension is not always constant as you tighten and not consistent bolt to bolt. What is relatively constant is the relationship between tension and angle of rotation. The issue here is the the angle count would have to start at the same position every time, but the screw might be run down by hand different amounts every time you install. To overcome this we use a starting torque that is relatively low where torque/tension relationship is more consistent. Once we reach that starting torque we have a relatively consistent spot to start counting angle of rotation from. And because the tension/angle relationship is constant up to yield, you get a more consistent tension at the completion of tightening. The reason we tighten into yield specifically is that it maximizes the amount of clamping force that can be generated with given fastener diameter. This allows smaller diameters which reduce the stiffness of the bolt. This in turn allows the bolt to be stretched longer allowing the bolt to more easily handle dimensional changes from differential thermal expansion and reduce the amount of preload lost due to relaxation.

I was taught to always recheck torque. Thanks for the video, you explained that better than I normally do. So many people just reuse those bolts, makes me cringe.

@rebelrailroader

5 жыл бұрын

Haha, thanks. I never caught the autocorrect.

I enjoy your quick to the point no BS channel.

This is why etcg is great. He tackles a tough subject, does his research. Very interesting.

Many good points made with solid theory. Thank You Eric!

In TTY bolts, the metal has been stretched beyond the elastic deformation range to plastic deformation; in other words, it has "yielded," and won't return to it's original dimensions. At this point, the metal begins to strain harden, allowing it to resist greater stresses without further deformation (ideal for holding cylinder pressures).

@pcnepal

5 жыл бұрын

Spot on!

@tastyburger9538

5 жыл бұрын

Very informative, perfect explanation of what a yield bolt is and what it does

@ethelmini

Жыл бұрын

Bolts don't have to be uniform. You can have one section go in to yield while the remainder stays elastic. If the load can be sustained in the elastic section there won't be further deformation if the, now, plastic section isn't subjected to a higher load.

A lot of good informative content here. Nice job.

Great video, I've always been told to not put anti-seize lube on certain spark plugs because it screws with the torque.

Wow. That's very interesting. This is my first time hearing about these TTY bolts. But then i obviously don't keep up with the latest stuff since i stopped turning wrenches a few decades ago. Good video.

@natelorimer8567

3 жыл бұрын

They been on certain cars since the late 80s.

Very interesting conversation starter here, I came looking for the torque specs on my 2010 mini base and found that the two camshaft stretchbolt angles were different even though the bolts were the same. I find that puzzling, but no more than having no woodruff key on such a vital component as the camshaft sprocket! Sadly you can't tell if a bolt has been used by looking at it, so I imagine you could find out the hard way that you have a used bolt. Great video, I have always put something on my bolts, either oil or locktite, and now I can obsess about having a clean bolt and clean hole when I put in my next stretchbolt.

Excellent topic.

Very informative. I never thought of torque in that way. 👍

Thanks for the info. I always wondered why I needed to replace the bolts even though they "looked" fine.

@Patrick94GSR

5 жыл бұрын

Honda says that suspension bolts must be replaced if they're removed. I've removed my suspension bolts on my 366,000 mile Integra more times than I can count, and have never once replaced a bolt. No problems whatsoever. But for the head bolts, you better believe I put brand new bolts in there.

Great explanation ..... something new I just learn thanks

Interesting stuff, good detail!

I love your videos. Great content!

Talking about torque variables makes me feel all warm and fuzzy.

Here’s a ghetto angle gauge for you, tip ex at the 12 o’clock position on the bolt head. easy for most degrees 45 and upwards. I have reused stretch bolts before with thread lock ( not cylinder head bolts). I don’t like doing it this. Nice video Eric. Keep ‘em coming 👍🏼

Great info!!!! Thanks man!!

It’s still sinking in... Just drop the mic and walk away. Awesome knowledge bomb. Great video sir. Thank you🤘

Good info, Eric.

super useful! Thank you

Moreover i have explained to people for years on TTY bolts... the broader yield range allows for error in variation of assembly line work.. allowing even clamping forces regardless of minor variations. This allows a higher end quality product out the door ensuring production numbers. In that its much better in the warranty period to have less head gasket failures than to worry whether or not head bolts are made reusable. Some import vehicles have used necked down head bolts (TTY) since the late 80s..regardless of them being classified as such then.. and should be replaced.

Great video.

I completed automotive school a few years ago and now I am in school for Mechanical Engineering. If you really want to understand torque to yield bolts you should look into what a stress strain diagram is and how that works.

Good stuff, thanks so much!

With crank pulley bolts it's sometimes the wrench that starts to yield first 😂 Sheared a 1/2" extension clean off. 😮

Good job Eric. Hope all is going well.

Eric, this all makes perfect sense. I was wondering how old worn threads vs. New ”virgin” threads effect on the torque&tension-ratio.

@decapitofamily3410

5 жыл бұрын

Unless rusted or damaged, IMO threads should always be a constant in the equation, bolt or stud threads should be considered an unknown. That's why they say torque to yield should not be re-used. I've never heard must re-tap threads after bolts removed.

makes sense ! good vid

Ahhh you have the new Ingersoll Rand electric impact! I've wanted one of those for a while now!

I think the idea is that you get a much more consistent clamping load with TTY bolts. If you look at a stress/strain graph for steel, once the material start to yield its stress levels off. So it doesn't matter that you don't go back over those bolts checking your initial torque, once they're all yielded then they'll all be the same.

@Al_Swilling

Жыл бұрын

Thanks for that explanation. It makes sense. I had the same concern that Eric had about not being able to go back over the bolts to check their torque.

Eric: I once talked to a guy about the process of re-installing a nuclear vessel head. Stainless steel bolts of 750lbs stretched with a hydraulic cylinder. Then they would torque the nut hydraulically then release the hydraulic cylinder.

that's really interesting. I thought that angle wrenching is worse than torque wrenching, now I'm understanding the opposite way - low wrench torque for such bolts is for fastening and angles are to create appropriate tension

Torque to yield bolts are great because they almost never need to be re-torqued after completing a torque sequence. The elongation of the bolt will keep applying clamping force as the surface creeps away from the head of the bolt. It is an annoyance to need to replace the bolts, when I rebuild my BMW M54 engine I had to replace every internal bolt as they were all Torque To Yield.

Thanks for the explanation :3

My digital Snap On Torque wrenches allow you to measure angle. It’s much better than using the angle gauge. If your doing lots of TTY bolts then it’s well worth the money.

I like the fact a lot of engine builders for race stuff measure the rod bolts stretch for proper clamping force over torque applied to the bolts/nuts. Yesterday was my B-day... I feel slightly left out.

@ETCG1

5 жыл бұрын

Sorry I missed it. Happy belated Birthday then!

i replaced the head gasket in my first car and reused the tty head bolts. didnt do the angle because i didnt know what that meant at the time. never had an issue with it, though it was a legendary volvo red block turbo motor. i miss that wagon.

BMW and Mini also use Aluminium torque to yield bolts because the block + head are a magnesium alloy. Because of that they can't use steel (incompatible metals) so they use Aluminium.

@hillarylevenworth8824

5 жыл бұрын

Are you sure??? Aren't they just aluminum plated?

Hey Eric, remember me ;) and our discussion when you upload “torqu nazi” chapter. I hope now you understand how much is in the so called bolted joint design and analysis... and why we engineers are so obsessed with proper torquing. All the best.

@ETCG1

5 жыл бұрын

That video is linked in the description. I never said torque wasn't important. I said there are some people that take it too far. Thanks for the comment.

Paint a line on the head bolt. I recall I liked the TTY head bolts much better than reusable head bolts because they had a dramatically lower torque value.

Hi. Another reason I believe is that 'older' engines had head bolt/nuts accessible to be re-torqued after 500 miles or so when gasket had settled. Less true new engines, OHC etc bolts buried under cams, manifold etc, so initial torque[tension] has to allow for gasket compression.

Interesting, learned something new.

Yes, torquing a bolt is a proxy method for gauging the "tightness" of a bolt which is then another degree removed from the actual part clamping force. With modern electronics, it's quite easy to shoot a vibration through the bolt and measure its "note" much like a stretched guitar string. This provides for an exact actual measurement of the fastener's tightness with respect to clamping force rather than rotational friction (torque). I would guess that within a decade or two, the notion of torquing a bolt will garner funny looks with the standard being ultrasonic measurements of stretch.

@ETCG1

5 жыл бұрын

Interesting. Acoustic torquing.

after reading a bunch of the comments, all I can say is this, if a component is designed to use torque to yield fasteners, get new ones from the manufacturer (not hope it was from the manufacturer, nock offs) and follow the manufacturers instructions. The manufacturer spent the time and money on R&D so if you follow what they specify, you cant go wrong. and a paint mark works great.

Yep, I just replaced the heads on my 1991 Explorer . As I totally rebuilt my engine 15 years ago, I can attest to the fact that is is damn difficult to get the 80 degree final Torque Yield applied when the engine in still in the car. That being said, I think, and correct me if I am wrong, but I think Ford has been using Torque Yield bolts since the late 80's. Took me a while to understand why Ford uses them. I think what it comes down to is $$$. Eric once did a video about throwaway parts. Maybe his premise also applies to head bolts. Would not surprise me at all.

Eric this was an amazing video. Thank you for the detailed explanation and the difference between torque and what the fastener is actually “fastening”. I have always loved your videos and hope you NEVER get discouraged by the new F$&@ing haters. You are a LEGEND. I have learned pretty much everything I currently know from you. Wish you the best man. Keep the videos coming.

@ETCG1

5 жыл бұрын

Thank you very much for that comment. I really appreciate it.

@davepritchett

5 жыл бұрын

It was all me... :)

Barb's Mini is looking good BTW!

I replace most torque to yield fasteners with OEM. OEM torque to yield bolts are not always the same as aftermarket. Good manufacturers give good guidance on the torque procedure just like ARP does with their fasteners. I believe Subaru provides great guidance on most of their torque to yield fasteners including lubrication. A torque angle wrench is mandatory the more you work on modern equipment. 53 degrees is fairly hard to hit with a torque angle gauge under a breaker bar.

Question: How do you check bearing clearance on crank main bearings or rod bearings when those have torque to yield bolts? Do I have to buy TWO sets of bolts - one to check clearance (then throw those away) then one for final fastening????

I had an issue with head bolts a few years ago. I was doing a head gasket job on my 74 Chevy truck with a 350. Even though I have solid grade 8 head bolts, I was trying to save time from cleaning and inspecting them and so I was thinking about just replacing them. One of the manufacturers that I was looking at was Fel-Pro. I looked up the part number on their chart and realized that the same part number is used for other newer TTY applications. So I contacted them. "I saw the same part number for both for vehicles that use TTYs and ones that use grade 8 head bolts. Are these TTY or grade 8 head bolts?" Their reply was, "There are whatever your application calls for." What the...? So I rephrased. And got the same response. (shrugged) Cleaned up and reused the old head bolts. Fel-Pro makes good gaskets, but I'm not sure their head bolt people could find their asses with both hands and a map.

@thebigmacd

5 жыл бұрын

It actually does depend on the application...if the torque spec on the old chevy was lower than the yield point on the TTY bolts they would function as conventional bolts. Steel has both elastic and plastic strain regions.

@maingun07

5 жыл бұрын

@@thebigmacd Sorry it took a while to respond. Thanks for your insight. Here is the torque chart from Fel-Pro: olybrake.com/pdf/fel_pro_torque_specs_guide.pdf If you go down to "GM L8 & V8" and then find 350 Chevys you should see what I mean. My torque spec is 65 in three steps. I've always gone 22, 44, 65. Seems to work just fine. But you'll also find specs for newer 350s that say stuff like "1st all bolts 22, 2nd long bolts turn 75 degrees, 3rd medium bolts turn 65 degrees, 4th short bolts turn 55 degrees". Unless grade 8 head bolts are damaged in some way, they should be fully reusable. My question to Fel-Pro was not "Will they function as a grade 8 head bolt?", but _"Are_ they grade 8 head bolts?" I'm having a hard time believing that those bolts will not yield on my cast iron engine at 65 fps making them non-reusable. Also, and I might be completely wrong on this so feel free to correct me, but I think I have just two bolt lengths, not three. It's been a few years since I've had those heads off so I might be dead wrong. This spring I plan on doing her second full rebuild (300k) so I'll figure it out then.

Another good thing with torque to yield is that you don't have to go back and check them (as long as you remembered to angle every bolt - as comment below). A standard bolt has clamping force directly proportional to the torque applied. Once a TTY bolt yields it will be providing it's intended clamping force. If you turn it further it will still provide the same clamping force up until it snaps. This also means there is some leeway in the angle setting, so it doesn't matter if you're just eyeballing 90 degrees. I would think that elasticity of the bolts would mean clamping the outside of the head does not take load off the bolts in the centre of the head, making them loose like standard bolts can get.

just learned this in school today everything u just said

Who is Almonds ? ( sorry could not resist Eric ) your always informative and entertaining nice one.

When i worked at boeing, i had to measure head to shank gaps in my fasteners. Sometimes the gap would be to great.... Holes not perfectly straight and such... Im talking.005 of a gap. I would correct this by removing the nut, applying oil to the threads, running the new nut down, removing the nut, cleaning the threads, then applying the proper torque on clean threads and remeasuring the gap. A little trick used to pass QA inspection.

Honestly, and I am by no means a master mechanic, I’ve never bought new head bolts unless one was damaged, I’ve worked on minis for a while now and it’s mainly the gen 2s that have head problems, we see them come in for that or oil leaks or LCA Bushings on the gen ones, either way, new head bolts are the right way, but honestly it don’t hurt too much unless you push massive performance

Curious of the measured length on the bolts you took out vs the new bolts that went in. .. ?

Angle torquing reminded me of installing an oil filter. "Oil the gasket, install finger tight and then turn an additional quarter turn"

CC says you’re saying tortillas LOL I laughed

Something to consider ? Is that the mass with the tty bolts in it gets hot and cold right? when it gets hot it expands, when it gets cold it shrinks right? So when it is hot with a standard bolt it is tight and when it is cold it is a little looser. But with tty bolts the bolt works like a spring and holds the same all the time. Better holding over time.

Love your videos wish I can get a day with u in your work shop

It's interesting to use a dial indicator to measure the bolt stretch as you tighten head bolts. In some airplane procedures it's done.

The available gauges (like the one you held up as example) are a PITA!. And, yes, there are digital versions - varying in price from just over $100 and up. I so much prefer using a dab of lube (as you mentioned), along w/ the tried-n-true double-click torquing method, and get on w/ the business at hand. I use my eye's built-in angle gauge. lol

Some tty bolt can be reused ONCE if the manufacturer specifies it. Did that with the head bolts of a Citroën.

@ethelmini

Жыл бұрын

There's loads of design potential in making fasteners. There'll still be a long way to failure once you've entered the elastic zone & the failure is still likely to be shearing the threads off, not stretching the bolt past its UTS. It's really about consistency of clamping force in the components you're holding together. Angular tightening doesn't mean they have to be TTY fasteners.

I believe Honda (don't quote me on that, I was told by a guy who is a reliable source but I have the short term memory of a 2 year old.) invented TTY bolts however I do like the name GM uses for those bolts as it seems more accurate. They call them Torque Angle Yield or TAY bolts. I think that name perfectly describes what they are and how they work.

I believe you.

A couple of points; It would'nt hurt them to figure out the torque needed to get the bolts to that last 90 degrees. By doing so, it can reduce the problems with doing the angle wrong. Not everybody has an angle gauge and/or wants to spend the money for one, especially if it is a one time use. Secondly, some manufacturers say to check the tty bolts for "necking" (necking is when you can see the bolts are stretched), if no necking, safe to reuse. Chrysler is one that does. But, in many cases, the bolts are cheap enough to just replace the set.

I have a 2015 m4, this m3/m4 motor "s55" has a known but rare issue where the crank hub bolt can back out, and the wheel that holds timing chain spins and can cause little to severe damage. BEFORE installing a crank bolt capture plate, is it ok give this bolt like a 1/4 turn? before finally locking it into place with the capture plate? Just want the clamp to be stronger on the sprockets that hold the chain. Yes I plan on tuning my car from 420whp to 530whp

Oh boy I'm never gonna look at bolts the same again .

There's a industrial fastener place just down the street from my shop, anything comes in here with stretchy head bolts they're getting replaced with hardened studs and red loctite

Things I learned today: bolts can be springs, I need to learn about that Honda so I can be cool, and almonds are the devil.

@ETCG1

5 жыл бұрын

⭐️

@Bouzoukiellas

5 жыл бұрын

Red heads are the devils work.

@TreyCook21

5 жыл бұрын

@@Bouzoukiellas - totally, but a redhead eating almonds? Run

I find this topic to be very complex, even spooky when one considers how close a bolt may be to failing when you are permanently stretching the bolt itself. Certainly it raises the bar when considering aftermarket competitors trying to manufacture critical components. You raise an interesting point about how other fasteners can pull the head into place, loosening elastic torque on those bolts tightened initially. In the end it is all about consistency across the head, explaining why torque is done as a series of steps. I guess I shouldn't be surprised that TTY bolts are popular in part because they permit the use of smaller parts that are closer to their breaking point.

@mattlane2282

5 жыл бұрын

Um, been being used forever with no issues... "aftermarket competitors trying to manufacture critical components." their are many many other more critical parts... if you watched he said he added oil to head bolts... so this means... the torque was wrong... right.... yet... no problem... LOL... how close it is to failing? REALLY... go look up how rebar works... REBAR stretches in concrete... to help prevent cracking where it is more critical they will pre stretch the rebar... and pour the concrete with the rebar stretched... im talking bridges and crap... your worried about a TTY bolt? lol....

You might also argue that TTY bolts apply a more consistent clamping force than just flat torque. The stress-strain curve of steel tends to flatten as soon as you get into plastic deformation ("yielding"), so the amount of clamping force exerted by the bolt is similar whether you land e.g. at 80° or 100° if the specified angle was 90°. Also, how often do you need to change a head gasket nowadays, and might that (lack of) frequency justify the use of single use only hardware?

Helo bro..must be replqce the bolts or old bolts is ok?

Did you "feel" the "give" or stretch of the bolt as you approached last part of the rotation of the torque angle? Is this normal?

When considering the torque felt by the wrench is produced by the friction of the threads acting upon eachother, oil will really throw off the numbers. When the oil bakes off and dries out it will greatly increase the amount of torque you need to remove the bolt as well. I have the same qualms with antisieze being overused.

Thanks I like this

Nice new intake for Dark Matter Pikachu, those heads look new too Eric. Also noticed what looks like a IAT sensor on that intake, EFI coming soon?

hi new to the youtube channel great videos what is the Ford FOCUS 1.0 12v EcoBoost rod bearing torques and degrees angle

Can I use arp head bolts and use torque to yeild on them?

Yeah, it's cool when thinking about system design because you're actually changing the properties of the material by torqueing to yield (you're torqueing past it's elastic modulus, IE the point at which is no longer returns to it's originial shape.)

ARP bolts has added torque to also make more clamping force to the subject there for the same tension applied tty bolts.

Often times the factory service manual will give you a measurement to take for the TTY bolt, if it falls under that measurement it's ok to reuse. Ive reused Mercedes-Benz TTY head bolts with no problems.