Posted by Janicholson on February 22, 2016 at 07:17:27 from (199.17.6.160):
In Reply to: Re-Torquing head bolts posted by JRSutton on February 22, 2016 at 07:05:18:
I do that to break the sticktion (static friction) of the bolt head/threads. My reasoning is that a 2 or 3 degree loosening is irrelevant to the current seal on the gasket, and prevents the wrench from "seeing" the set the bolt has taken. The reasoning follows from experience. Pulling the wrench tighter only often finds the bolt meeting torque spec as is. If I break it loose a tiny bit that same bolt might make 10 degrees further in the tight direction that it would not have had, but still to the torque specified. Turn of nut and bolt stretch methods (turn to yield) are common now because twisting force is inconsistent with clamping force. Jim
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