Quote:
Originally Posted by tekuhn
Ah, OK. I didn't realize it was missing from the beginning. Not being critical at all. Has me rethinking whether I need to pull an engine I've had sitting installed in the chassis and never fired yet. I'm pretty sure I used Clevite 77's. This bearing thing could have been easily missed. I think I do understand what the machinist is saying. When you measured your thrust end-play, the crank was stopping short of reaching the rear-facing thrust face on #4 and instead stopping because the crank journal radius was hitting the rear edge of the #5 bearing shell. That would explain the weird noise that you heard when you pushed in the clutch in the final moments before seizure. The number 5 bearing edge and crank journal radius was under extreme contact from the pressure plate pushing the crank forward until it failed.
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Exactly. He said that with aftermarket crankshafts, specifically my Scat and an Eagle he measured, they are longer compared to the stock Pontiacs he measured. Either overall or in a specific area, I don't know.
So, when one measures end play, you get a good mesurement. This is a false measurement though. Had I used a stock crank, I would have had too little endplay with these bearings and known there was a problem.
I don't know what to suggest to you. Of course, based on my experience, I would tear it down. Remember, my machinist bought a 10 under set of Clevites, and same problem as mine. So, this wasn't a one off error.
I emailed Butler tonight. I want them to test the Clevites vs. FM.