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Posted by clueless [201.202.29.210] on Tuesday, February 07, 2012 at 10:45:15 :
In Reply to: Re: rear main seal question posted by Kaegi [24.16.253.154] on Monday, February 06, 2012 at 21:28:35 :
Rear Main Bearing Seals
Engines built before 1951 used a rear main seal that incorporated a flat metal flange with three screw holes in it. These seals required removal of the flywheel to allow replacement of the top half. Later flathead engines used a different neoprene seal design that could be rolled into place in the top half by loosening the crankshaft, much as you would in replacing a top rear main bearing. The two types of seal are not compatible reciprocally, due to block casting differences.
