Head bolts

[glove]

It is not right that the bolts have to be changed  definitly, I am using the original ones for third time, no problem. The bolts are stretched when the engine is overheated or something drastic happened with the engine, broken piston, broken crankshaft. If you are planning to change only the head gasket it is no problem, the original ones are more stronger then the replacement ones.

[Wayne]

It is not right that the bolts have to be changed  definitly, I am using the original ones for third time, no problem. The bolts are stretched when the engine is overheated or something drastic happened with the engine, broken piston, broken crankshaft. If you are planning to change only the head gasket it is no problem, the original ones are more stronger then the replacement ones.

Wrong they must never be reused, they are stretch bolts and a use only once item.

[glove]

Wrong they must never be reused, they are stretch bolts and a use only once item.

I don`t what to argue, I am speaking from experience and testing in the lab on stretch machine.

[Wayne]

Wrong they must never be reused, they are stretch bolts and a use only once item.

I don`t what to argue, I am speaking from experience and testing in the lab on stretch machine.

They are torqued to spec, then a further turn is used to stretch them, they are cheap enough to buy so cannot see any point in risking it by using them again.

[glove]

Wrong they must never be reused, they are stretch bolts and a use only once item.

I don`t wnat to argue, I am speaking from experience and testing in the lab on stretch machine.

They are torqued to spec, then a further turn is used to stretch them, they are cheap enough to buy so cannot see any point in risking it by using them again.

 I told you that I don`t want to argue, I have don quite a big number of engines and a lot bigger, I know what I am doing. I know a lot of things for stretching and strength of the materials. I am a Mechanical Engineer specialty Marine Engineering. I told you I am I am speaking from experience and testing in the lab. Yes if he wants to by new set no problem.

[clipperjay]

TBF if the bolts need to come out its usually some issue with the head or block so its a matter of course to change out stretch bolts of course they have tolarances so do gaskets, but I still change them regardless. One day the bolts will shear and then the drill bits come out   
on another note every MK2 brake splash shield plate I've had to drill out the retaining bolts that hold them in stupid 8mm bolts wish they use god dam heat proof plastic revits instead as I'll have to spend an hour per side drilling in sizes just to get the plates off not happy!

[AudiA8Quattro]

The bolts are stretched when the engine is overheated or something drastic happened with the engine, broken piston, broken crankshaft.

No, the bolts stretch when you angle tighten them.

I have don quite a big number of engines and a lot bigger, I know what I am doing. I know a lot of things for stretching and strength of the materials. I am a Mechanical Engineer specialty Marine Engineering. I told you I am I am speaking from experience and testing in the lab

So why does every manufacturer state that they must be replaced? I think i know what advice i'm going to take!

[mk2bal]

I re used the bolts on my 1.3 h/g no problem, it was a saturday afternoon and getting the gasket off the shelf was lucky enough! It was back together later that night with only a clean up and a new gasket used,no skim etc and it lasted a year and a half no problem. Not gospel engineering evidence/proof, just my experience.. I wouldn't rush or skimp on a better engine though, i read somewhere possibly here that bolts can be had for peanuts really..

[Diamond Hell]

I told you that I don`t want to argue, I have don quite a big number of engines and a lot bigger, I know what I am doing. I know a lot of things for stretching and strength of the materials. I am a Mechanical Engineer specialty Marine Engineering. I told you I am I am speaking from experience and testing in the lab. Yes if he wants to by new set no problem.

You can tell people you don't want to argue all you like and that you're an engineer.

What you're suggesting is to go outside of the spec VW recommend, which is to NOT reuse the bolts.

The bolts are stretched when the engine is overheated or something drastic happened with the engine, broken piston, broken crankshaft.

When you're spouting shyte like this people are going to call into question your knowledge, because it's rubbish.

the original ones are more stronger then the replacement ones.

Love to know how you figure this one.    Are the original ones made out of VW-spec unobtainium?

[JC]

DH and A8 in a kinda agreement shocker 

Popcorns in the Microwave, back soon