Quote:
Originally Posted by frankwjr
TTY bolts on the motor of course need replacin..different stress...as for the drive train? Once maybe twice re-use with lock-tite and "mechanic" tight...if you don't understand this, then replace..never had a prob...many will agree and sum will not...and this is per my Master Chebby Tech....good luck!
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After reading up on these bolts, I’d say if you want to re-use them, don’t torque to the full stretch value in the manual. If you do, you permanently stretch it twice. That means you’re that much closer to failing the bolt.
In the stress-strain chart below, the vertical axis represents force or tension on our bolt. The horizontal axis represents stretching of our bolt.
A regular bolt would be tightened to point A or maybe point B. Point C is the Yield Point. A and B are stretch below the Yield Point and therefore, remain elastic and will return to original length.
From Point C an onward to the right, is the “plastic region”. The bolt is permanently stretched in this region.
Point D is where the metal becomes stronger from work hardening. At the crown of the curve, between Point E and F the metal begins to fail.
TTY bolts are intended to be permanently stretched somewhere between Point D and E. If you permanently stretch it twice, it could put your bolt beyond Point E or F.