Quote:
Originally Posted by Richbot
Mains are the same material as the Rod bearings, with the same clearance issues, according to the people who know things
Just looked at my reports. My change after about 400 miles after BE bearings went from 20 lead to 2, then 0 on the next oil change 3500 miles later
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Thanks, Richbot.
So, lead/copper mains? Interesting as it seems fairly common for these engines to show little or no lead, even with leaded rod bearings AND mains -- including yours, apparently. The few UOA reports I've seen from S65s with 702/703 rod bearings all seem to show zero lead, IIRC.
Am I off-base on any of that? All of it together would seem to suggest that ICP spectroscopy is pretty much useless for detecting main bearing wear -- maybe because main bearings chuck out large particles when they do wear, and basically nothing when they don't. That'd be a slight contrast with rod bearings, which seem to produce ICP-friendly particles at least
some of the time when they wear.