I've always backed em off just a bit then torque it. Backing it off a bit
breaks
the crud on the threads so you get an accurate reading. Just back it off a
small
amount. You do know to do this one at a time. Follow the same torqueing
sequence used when you first tightened them. Also make a second pass on all the
nuts after you do them all.
Dennis
67 MGB
DON SCOTT wrote:
> Can anyone offer some tips on this? When retorquing a head, is the proper
> procedure to back off each nut/bolt then retighten, doing them all in
> recommended sequence? And when backing off, how much? A friend was told not
> to back off the nuts/bolts first, just to retorque.
>
> Years ago, I had a Toyota Celica that was weeping coolant from between head
> and block. I retorqued the head and it solved the problem. I used the
> "back-off first" method at that time. It had an aluminum head on a cast iron
> block rather than cast iron for both- I don't know if the procedure varies by
> application.
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