Posted by jimg.allentown on February 22, 2016 at 14:58:52 from (108.16.40.179):
In Reply to: Re-Torquing head bolts posted by JRSutton on February 22, 2016 at 07:05:18:
In EVERY case, the manual takes priority. What is told by the people that made the engine should be regarded as the LAW. So, having said that, I will add just a few points of information..... Unless instructed to do so, re-torqueing a warm engine is not advised. The main reason is how to tell just HOW warm it "should" be. While the bolts DO expand and lengthen when warm, so also does the surrounding material like the block and head. Overall, it should be a net zero result. NEVER, NEVER, EVER re-torque stretch bolts. These are torque to yield bolts, and once yielded, are meant to remain as they are until the next time a head is removed. And then they are meant to be replaced. When re-torqueing, I would personally recommend loosening a few degrees first, then re-torque. The initial force required to start the bolt turning can exceed the torque that has been applied to the bolt. This results in an inaccurate torque reading. In EVERY case, the procedure given in your manual for that machine is the gospel truth for that machine. Whether it be an engine, a transmission casting, a bearing housing, or whatever. Also, know that the accuracy of the torque to the inch-pound is not nearly as important as the UNIFORMITY of the torque. Uneven torque causes metal castings to warp. Evenly tightened castings will generally live longer as a rule.
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