Re: [DML] Angle Torque & head bolts

["cruznmd" <racuti1@xxxx>]

Bah. I've reused them in all of the engines I've pulled heads on.
Ford, Toyota, Renault, International Harvester and now the PRV.

You just can't go crazy on them. I certainly agree I wouldn't do it in
a high-performance or racing environment or if I was trying to make a
concours DeLorean but if you're just putting an engine back together
for everyday use, I think it's fine.

Just my 2 Mhz. ;-)

--- In dmcnews@xxxxxxxxxxxxxxx, mike.griese@xxxx wrote:
> This falls under the "just don't do it" rule
> of auto mechanics. Head bolts are cheap compared
> to what can happen if one fails. Just don't reuse 
> them.
> 
> Measuring torque on a fastener is an indirect method
> of measuring the amount of tension applied to 
> the fastener. It's an approximation, since there are
> a number of factors that influence the torque reading 
> on a wrench. The condition of the threads, the 
> condition of the surfaces of the bolt head and nut,
> any lubricants on the threads, thread locker or 
> anti-sieze all have an effect on torque readings.
> Measuring angle torque removes a lot of these other
> influences. The angle the fastener is rotated
> is a direct measure of the stretch in a bolt because
> the thread pitch is known. In racing applications where 
> both ends of the fastener are accessible, mechanics actually 
> measure the length of the fastener before torquing and
> after to ensure the correct amount of stretch is 
> achieved.
> 
> 
> --
> Mike
> 
> > When reattaching the head, the manual recommends that once they're
torqued
> > to the proper setting, you should angle torque 113 degrees. I've been
> > researching angle torque and have a pretty good understanding of
it now but
> > what I'm wondering is if anyone has actually applied this method?
> >