Factory bolts with colored thread adhesive

If the manufacture says not to reuse them they should not be reused with out exception. MB, Porsche and others have had TTY bolts for decades they are measurable (not all of them) and if stretched beyond spec. they can not be reused. Torque values are usually rated "lightly oiled".

 

Careful Rich, he might call you out next. lol.

 

I still dont get it.
1. If bolt is non-reusable then its non-reusable. You can reuse it but you should expect a failure when you tightening to spec. Having loctite changes nothing here. I learned hard way not to reuse bolts although sometimes I am cheap. Last learnign session was when I snapped stud on knuckle. Had to take whole axle a part to drill that sucker out.

2. Loctite should be put only on last 2-3 threads of the bolt.

3. No loctite product when properly used should change torque specs. If it does then its junk.

 

Use Google search engine with the words , loctite changing torque values

 

Too many hits for that, lets focus on quote from manufacturer..

Loctitie supposed to be put on few threads only and at the end of the bolt. So when you tighten the bolt final 2-3 threads actually catch the loctite. Who smears whole bolt in loctitie
Yeah maybe when you dip bolt in loctite then there is a change but that means you dont know what you doing in first place.
EDIT: Does that means we need sticky on how to properly use loctite?

 

I prefer using a simpler and as effective torque value determining system. Works with or without lube, locker, etc.

1. Tighten bolt until it spins freely.

2. Back off 1/4 turn.

 

oh yeah I did this too...my head bolts.

runs like a charm, I only need to add 4 quarts of oil every 10 miles.

I used Lagunito suggestion and googled it. works for me. now to find
a cheaper source of oil. I think I need to get 12 cases at a time now.

 

Get it by the drum. Saves on packaging costs and you can make those cool sounding island drums when they are empty!

 

Yeah is sure changes the torque spec when you go to remove it!

 

that's RIGHT ! I do have a tacoma after all. I can get drums

 

You could start a band!

 

loctite changes breakaway torque by a significant factor.
that is what it is for...it's sole reason for existing

from Loctite web site:
The main function of any threadlocker is to maintain your torque. It has been determined that over time, due to various factors, such as vibration and side sliding, you lose up to 30% of your on torque. In order to maintain your torque over time, the goal is to choose a suitable threadlocker that provides a breakaway value equivalent to 30% of the torque you apply to the assembly

 

Just put the drum in the back of your bed and install a level sensor in your oil pan that turns on a small pump when the oil level gets too low!

 

http://www.henkelna.com/index.htm
Is the parent company of Loctite.

Here is and example of the information on their site regarding the testing they perform on Loctite thread adhesives

Viscocity of loctite blue green gel is measured on a Brookfield laboratory viscometers - using an RV spindle (http://www.brookfieldengineering.com/img/products/accessories/spindles/RVSpindleLarge.gif)
2 and 5 at degrees celcius , mPas (milipascal senconds)
spindle speed 2.5 400,000 to 90,000

Here is the explaination of a rotational viscomerter

http://en.wikipedia.org/wiki/Viscometer#Rotational_viscometers

The Viscometer measures the torque of a fluid, which if applied to a threaded fastner (even the first few threads) needs to be part of the calculation of the required torque settings.

Consideration of these calculations were somewhat simplified in the original post of this thread by information provide by an online link of a supplier of one group of loctite products.

Part of the "required" tightening specifications are left up to the end user and their aquired abilities and comprehension of physics and mechanical engineering.

 

It really depends on the application you are using the Loctite for. For example the blue 242 Loctite says if you are using a nut and bolt, to apply it in several drops at the bolt and nut engagement area, but in a blind hole (i.e. bolts that thread into engine blocks such and mount bolts and bracket bolts) they say to apply several drops along the entire bolt shaft. Also, if the bolt is a sealing bolt (One that goes into a water jacket) that you should apply a bead over the threads, leaving the first few threads clean.

http://www.loctiteproducts.com/p/t_lkr_blue/directions/Loctite-Threadlocker-Blue-242.htm

 

Torque to Yield Bolts

With a regular head bolt a technician could torque a bolt to its yield point and it would return to its original form and length when removed. This is because of its elasticity, it is able to stretch and then return to its original form.
This is not so with a torque to yield bolt. There are two terms related to this phenomenon. The first is elastic deformation and the second is plastic deformation:
1. Elastic deformation: This is the amount of force or torque where you haven't changed the shape or length of the bolt. At this point you are able to reuse the bolt as it hasn't changed its shape.
2. Plastic deformation: This is the point past elastic deformation where the bolt has changed its shape and length. At this point the bolt can not be reused and needs to be replaced.
For example an aluminum cylinder head will be torqued in a sequence say one to ten. The first pass would be a torque of 36 foot pounds. This is the elastic deformation point. The second pass would be a 90 degree angle or a quarter turn. At this point the bolt is going into plastic deformation. The third pass would be another 90 degree angle. 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.
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. Remember, a lightly oiled bolt should be easily screwed all the way in and out of the bore with only your fingertips. If there is excess resistance there is probably something wrong with the bolts threads. Always check with manufacturers specifications and TSB's when working with engine bolts, especially if you suspect them to be TTY bolts. TTY bolts are common and typically used to clamp cylinder heads on late model engines. Be careful, a loss of clamping force will ultimately lead to head gasket failure.

http://www.freeasestudyguides.com/a1_4.html

Ironically this is from an ASE study guide

Now who's confusing what?

I guess one needs to be careful whom they call ludicrous?

 

Not this shit again

 

This shit is AWESOME!

 

I'm by no means a mechanic, but if the FSM lists a part as non reusable, there's probably a pretty darn good reason. You are also subjecting the bolts to larger torque than intended by reusing them. The bolts are only subjected to 187 ftlbs in your example when installing them, but 207 when uninstalling them.

Even if a bolt doesn't enter the plastic state and permanently change shape, micro cracks form once the stress reaches a certain level, and if the loading is repeated, fatigue failure can happen.

I'd rather be safe and spend a couple extra bucks on some bolts than potentially thousands after the bolts have failed because I reused them.

 

Lagunito

you really need to shut your pie-hole. you post incorrect information
and then try to back it up with more incorrect information. you are using these forums
for god knows what....but it is not useful stuff. and you are blind to the fact you
are schizophrenic. so for everyones sake, seek professional help.

for god sake boy, there are a lot of engineers here who have forgotten more
than you will ever know, and it only takes 1/2 second to see how off-base you are.

you google some facts, and then half-ass it all to shit...


broseriously...are you 4 years old or have you made it to 5 yet ?

you are King at one thing though...Trolling.