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-   -   Head stud tightening methods (http://forums.pelicanparts.com/911-engine-rebuilding-forum/296176-head-stud-tightening-methods.html)

bdonally 07-30-2006 05:05 PM

Head stud tightening methods
 
I have searched this but couldn't find an answer. This is for a 3.2.
Factory manual says 11 ft-lb then 90 degrees, with no mention of reotorquing
Wayne's book and several posts say two stages, final tightening to 23.5, with re-torquing after a bit of running.
I followed the factory method - the nuts are considerably tighter than 23.5.
Also, there is no way to re-torque later with the tighten then 90 degree method. To the best of my knowledge, when bolts are tightened by a stretch method (which essentially the factory method accomplishes) there is no need for later re-torquing. Properly installed rod bolts would be an example.

So, what is the right thing to do?

Eagledriver 07-31-2006 07:41 PM

A few people recommend re-torquing headstuds. The rest of us and the factory recommend not.

-Andy

cstreit 08-01-2006 10:52 AM

I've always checked mine on new engines after a few hundred miles or so... Never had one that needed to be re-torqued...

bdonally 08-01-2006 03:50 PM

Quote:

Originally posted by cstreit
I've always checked mine on new engines after a few hundred miles or so... Never had one that needed to be re-torqued...
Do you use a torque spec or the turnof-the-nut method for tightening at assembly? If the latter, what do you use as a spec to check later?


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