Gee, I thought all you guys in vintage racing just put your engine
together and ran it for 3 or 4 seasons until you got tired of that car
and bought another. regards, Murray Taylor
lwdent wrote:
>
> Ok here's the deal on rod bolt stretch.
>
> New style rod bolts have a small center depression in both the head of
> the bolt and the other end of the bolt.
>
> The stretch gauge is nothing more than a dial indicator reading in .001
> increments with the ability to estimate (space between the marks, in
> other words) to a ten thousand.
>
> Each end of the gauge, the dial indicator and the other end of the c
> clamp like device, has a pointed tip that fits into the depressions on
> each end of the rod bolt. Thus you are measuring total stretch of the
> bolt regardless of the length.
>
> Now in my view, the critical factor here is the mfg's spec on how much
> stretch for that bolt in that application. Each set of bolts is
> packaged for a particular rod/engine and the mfg tells you with a little
> slip of paper how much stretch is needed.
>
> Also included in the package is a small pack of a moly lube.
> Instructions say lube with this and if no stretch gauge is available,
> torque 3 times to 40 PSI, release each time and stop with the final 3rd
> torque. The instructions also say to measure each bolt BEFORE
> installation with a mike and measure each usage to make sure the bolt
> has not stretched beyond yield. Toss away at that point.
>
> Larry Dent
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