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Old 03-22-2019, 07:02 AM   #18
Junior Member
Join Date: Nov 2010
Location: Lexington, S.C.
Posts: 5
Default Re: Rear Main Bearing Oil Behavior

The above graphic and explanation is well written and provides more detail than the average Model A owner needs, or can understand. It appears to have come from an Engineering 101 book. When most people start getting oil into the bell housing and on their clutch they want a fix for the problem. The above explanation did not provide a solution to the problem. While there can be numerous reasons for the oil getting in there, the most likely reason is excessive bearing clearance. There again, returning the bearing clearance to the .0015 specification stated in Les Andrews book will go a long way to solving the problem. As I also stated, if you will put the small piece of tube in the hole in the valve chamber to slow down the flow, you can help prevent the slinger groove and drain tube from becoming overwhelmed.
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