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over torqueing

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over torqueing

Postby TRD_ZERO » Sun Dec 07, 2008 7:15 pm

OK so i made abit of a blunder how serious is it if i overtorque the head it was supposed to be 22ft-lbs when i made it 30. Should i just leave it? pull the headstuds out and redue it?( they might be abit stretched now though). Its a blacktop if it matters.
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Postby evil_si » Sun Dec 07, 2008 7:21 pm

ok was it 30ftlb on its own or are they torque turn as well?

the torque spec of 22 should have a +/- figure or percentage, do you know what that was
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Postby Mr Revhead » Sun Dec 07, 2008 7:23 pm

22ft-lbs is just the first step
take them out and do it again
with the 20vs you torque them, then do another 90 then 90
so 30ft-lbs wont have over torqued it

are you using new bolts?
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Postby TRD_ZERO » Sun Dec 07, 2008 7:36 pm

yes im using new bolts i torqued them to 30 ft-lbf then 90 then 90 again. So it will be ok to take them out and do it again, they wont be stretched? the book says 22 ft-lbf thats foot pounds right?
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Postby Grrrrrrr! » Sun Dec 07, 2008 7:39 pm

Not sure whether you will get away with leaving them in, but if you do take them out its bin time for those headbolts. Do not re-use torque to yeild bolts.
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Postby TRD_ZERO » Sun Dec 07, 2008 7:52 pm

evil_si wrote:ok was it 30ftlb on its own or are they torque turn as well?

the torque spec of 22 should have a +/- figure or percentage, do you know what that was


NO it doesnt have a +/- on it just straight up figures
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Postby 85AW20v » Sun Dec 07, 2008 9:07 pm

There is a specific range regarding length that the bolts have to be within. As I understand it, if they are within the range they can be reused. Standard length is 114-115.00mm. Maximum length is 116.50mm.
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Postby jondee86 » Sun Dec 07, 2008 9:37 pm

Leave them be... don't worry... be happy :)

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Postby TRD_ZERO » Sun Dec 07, 2008 9:48 pm

ive asked around and im getting mixed responses, im getting a few people saying i should just leave them they will be fine. What could happen to them?
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Postby Mr Revhead » Sun Dec 07, 2008 9:56 pm

heres some info
http://www.acl.co.nz/Tech/Torque%20To%20Yield%20Headbolts.pdf

after reading that, I'd changing them...
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Postby levinguy » Sun Dec 07, 2008 10:11 pm

seriously due to the hassle of what could happen, i would just replace them, is it really worth risking it?
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Postby TRD_ZERO » Sun Dec 07, 2008 10:59 pm

levinguy wrote:seriously due to the hassle of what could happen, i would just replace them, is it really worth risking it?


You are right ill get some new ones then.
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Postby Bazda » Mon Dec 08, 2008 1:58 pm

or get some arp heas studs.
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Postby NZ_AE86 » Mon Dec 08, 2008 5:30 pm

I'd leave them in, they will be just fine.
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Postby TRD_ZERO » Mon Dec 08, 2008 7:51 pm

I went to an engine reconditioner today and asked them they said it should be fine and i should just leave them.
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Postby pc » Mon Dec 08, 2008 8:55 pm

I reckon it'll be fine.

I over torque all my headbolts a little bit anyway, haven't had a failure yet.
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Postby fangsport » Mon Dec 08, 2008 9:49 pm

pc wrote:I over torque all my headbolts a little bit anyway, haven't had a failure yet.
a wee bit of extra squeeze won't hurt, no worse than going 95 then 95 degress on rotational torque.

on a good day, might even sqaush the gasket more and bump the compression slightly!!!!
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Postby TRD_ZERO » Mon Dec 08, 2008 10:19 pm

Im hoping it was a really good day.
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Postby MAGN1T » Tue Dec 09, 2008 2:54 pm

It's only an intermediate step, doesn't matter. The purpose of the intermediate steps is to ensure the bolts are done up evenly.


As for the link.

I don't understand how putting a 10mm bolt into a 10 mm hole (in a block & head) is going to save any significant weight over a 12mm bolt in a 12mm hole.

Strange logic.... sure the bolts are lighter ...what about the holes?

Sure , steel bolts, aluminium head but?


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Postby Dell'Orto » Tue Dec 09, 2008 3:52 pm

I know if Henry from ACL wrote that, I'd believe it over anything you type on the internet Steve ;)
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