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Torque Spec Question. 120-130

posted by  walrus3 on  Sun Oct 29 09:08 CST 2006
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

The manuals I have (several of them) say torque them to 29 ft-lb,
then to 58 ft-lb and finally to 65 ft-lb.

Breakout torques (in EITHER direction) will always be higher than the
original torque unless the bolt has worked loose or stretched somehow.
Among other things, the lube will gradually dissipate and you'll lose
the lubrication and get intimate metal/metal contact. Both of these
make the bond that gives you the "crack" sound when you break them loose.

When I put in headbolts or maincap bolts, I run a tap in the hole to make
SURE it is clean and not gritty, and then I put a little chassis grease
on the threads and on the clamping surface of the head. That way as much
as possible of the torque goes toward actually advancing the threads so you
get the maximum amount of tension in the bolt for the applied torque.
--
George Downs Bartlesville, Heart of the USA!






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