Oil in and out of bearing
I have read posts about oil filters, 90 degree adapters and prevention of "dry starts", all along I have known that it is not a problem, that after a recent shutdown there is much oil still in the bearing, with this engine the recent shutdown was 10-15 years ago, yet there is still enough oil in the bearings to form runs, and drops ---more than enough to not have a dry start.
The shim on the rear main explains why the flywheel and clutch had no rust, It must have left a trail wherever it went after it's most recent overhaul.
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