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but compared to rebuilding an M96 that overheats because coolant passages were plugged by plastic debris ........
If it really is just dust - there should be broad scraping marks(not gouges) in the part of the w/p housing that is cast into the crankcase half. Easy to see.
If every blade is intact - just ground down -maybe the missing material is dust.
If so ,some flushing may be helpful ?
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