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Hey Jim, just out of curiosity, were the side case bolts loose? The clutch side of that crankshaft is supported by a bearing in that removable case and if it was "breathing" due to loose bolts, that would allow a hammering effect that would severely fatigue the case. Evidence of this might possibly be visible in the case sealing surface as fretting (kind of a gouging type thing).
I have an airplane engine that "threw" off a cylinder due to a mechanic applying silicone type sealant on the cylinder base where none is supposed to be. It allowed the cylinder to hammer enough that the attachment steel studs broke and allowed it to depart from the engine. I could see evidence of the fretted aluminum case that I could feel with a fingernail.
Ultimately I guess it doesn't matter as that engine is done.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
0% Liberal
Men do not quit playing because they get old.... They get old because they quit playing.
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