Quote:
Originally Posted by BoxsterGT
Thank you JFP!
Is there any chance that there is no damage internally save for replacing these thrust plates?
Is it possible that a teardown & reassembly is all that is needed?
Is this another example of a design snafu?
What would cause this to happen? The car was extensively track driven, may have even been oil starved in certain corners of certain tracks.
Len
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If the thrust washer is out of place, the steel crank is resting on or striking an alloy crank carrier, which ain't good. This part is a "wear item", particularly if you are running a clutch with higher than stock clamping pressures. Personally, I would not run an engine that has one out of place. A rebuild is the way to go, but carefully check the crank endplay, you may need a new carrier as I do not believe these are available in larger thicknesses.
As for why it happens, the answers are all over the map; we have seen them fail on gingerly driven streetcars, and live long lives on cars that regularly get the crap beaten out of them. My pet opinion is that the quality and temperatures of the oil come into play and that once they begin to wear; crank movement increases and finishes the job. And, as I have noted, every once in a while we have seen one installed backwards, which leads to a short and inglorious life........