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<All> Head bolt torque tips
Hey, group, I was just cleaning up some papers last weekend and found
an engine building booklet printed by Hot Rod magazine. It had a
couple of tips related to head bolt torquing (an occasional subject
of discussion here) which seemed worth relaying. Here they are:
1) When torquing head bolts, always use a washer under the bolt,
even on cast iron heads. Also, put a drop or two of oil between the
washer and the bolt head. This lessens friction and ensures a more
accurate reading from the wrench.
2) AFter torquing all the head bolts, let them sit for an hour or
so, then back each bolt off about 1/4 turn, and re-torque. If you
mark each bolt relative to the head, you will find the bolts turn
farther the second time it's tightened to the same torque spec. This
evidently "overcomes the breakaway torque" required to reach
the final torque setting the first time.
The floor is open for discussion......
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