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Old 07-03-2004, 05:02 PM
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rear main leak

Trying to fix oil leak by rear main seal, but am really stumped. 68, 327. Installed new extended lip seal twice now, but to no avail. Crank seems smooth by seal area, replaced cam plug, it showed leakage,and galley plugs are dry. Upper half of rear main seal seemed to install too easy. I always thought they should be a snug fit upon installation. Maybe I got wrong seal, but I doubt it. Checked several sources. Any body help me? I'm a new guy here, but am an old hot rodder. Engine is a 1968 327-350HP, in my 64 vette. Thanks, skids

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Old 07-04-2004, 09:22 PM
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some people offset them in the block about a 1/8 inch. i never had any luck like that. what i do is get a new rear main seal, put just a lite smear of silicone on it (where it fits into the groove in the block & cap), & just a little on the mating surfaces. i don't have any trouble with them ever leaking, ever.. i'm going to ask a stupid question, are you putting the seal in with the lips facing the front of the block or the transmission ? if you put them in backwards, they will leak every time. what all have you tried?
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Old 07-04-2004, 09:29 PM
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You might be working against yourself if you're installing a rear main in a motor that really needs a rebuild. The problem is this: as the main bearings begin to get greater amounts of wear, they allow the crank to chuck around a bit more and begin "boring" out the rear main. So if your motor's got a ton of miles on it, chances are its just going to knock out your new seal as well.

Good luck either way-

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