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01-13-2019, 01:26 PM | #1 |
Senior Member
Join Date: May 2010
Location: Long Island, NY
Posts: 3,432
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Rear Main Bearing Oil Behavior
This is my theory regarding oil leakage from the rear main bearings of Model "A" and Model "B" engines. This theory is a bit long, so please bear with me.
It is reasonable thinking that as the bearing clearance increases from wear, the oil squeeze-out and overflow into the flywheel housing increases. It is reasonable that as the end play of the crankshaft increases with thrust bearing wear, oil squeeze-out and overflow into the flywheel housing increases. Here's the evidence behind my theory. I am currently running a Model "B" engine that has an extra oil drain in its rear main bearing. This drain exits above the crankcase oil level. Bearing oil leakage onto the ground has been almost none. However, some oil does get to the ground, and it comes from the transmission. The 1st generation throw-out bearing access cover does not have vent louvers, so air pressure is produced in the flywheel housing by the spinning flywheel. The 2nd generation cover has louvers to vent the air pressure buildup. By using a cover without vents, the pressure in the flywheel cavity would act to significantly reduce any oil leakages. Okay, amuse me. Fire away at my theory.
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Bob Bidonde |
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