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08-17-2012, 06:29 AM | #21 |
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Location: NC
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Re: More questions of fixing a rear main oil leak
I had bad luck with the Burtz seal, and the cork seal for pressure. You need a real lip seal like a chev rear main seal. But that takes a lot of rework to crank and block alum seal. Also a lot of cranks have run out on the seal area. Sum grinders do not dial in the crank. In that case it will leak any way. I always check for run out.
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08-17-2012, 06:58 AM | #22 |
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Re: More questions of fixing a rear main oil leak
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08-17-2012, 07:46 AM | #23 |
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Re: More questions of fixing a rear main oil leak
spinelll, here's a couple close up photos.
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08-19-2012, 06:10 PM | #24 |
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Re: More questions of fixing a rear main oil leak
george miller, could you expand on what type of rework needs to be done to the crankshaft and seal/cap areas. Right now the slicker on my counter-weighted crankshaft has been completely removed to a diameter of 2.090". Can the crankshaft still be modified to take the Chevy lip seal?
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08-20-2012, 06:57 AM | #25 |
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Re: More questions of fixing a rear main oil leak
Perfect pics.
Thanks Al |
08-20-2012, 07:19 AM | #26 | |
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Re: More questions of fixing a rear main oil leak
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08-20-2012, 10:34 AM | #27 |
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Re: More questions of fixing a rear main oil leak
Al and George ... I have an identical situation as spinelll and would appreciate any pics and information on how to change over to a chevy two piece seal.
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05-16-2013, 05:01 PM | #28 | |
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Re: More questions of fixing a rear main oil leak
Quote:
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05-16-2013, 06:45 PM | #29 |
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Re: More questions of fixing a rear main oil leak
How is the valve train lubricated?
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05-17-2013, 07:07 AM | #30 | |
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Re: More questions of fixing a rear main oil leak
Quote:
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05-17-2013, 07:55 AM | #31 | |
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Re: More questions of fixing a rear main oil leak
Quote:
Last edited by Chris in CT; 05-17-2013 at 07:57 AM. Reason: spelling |
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05-17-2013, 08:57 AM | #32 |
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Re: More questions of fixing a rear main oil leak
Al, I am reworking an engine with the same problem you have. I studied the crankshaft, as Chris suggests, and I found the seal contact area of the crankshaft to be machined .0012" off center with the rear journal. Further complicating the issue, the contact area is machined to about the same diameter you have...near the lower limit. The engine is not pressurized. The engine will perform well on my test stand and run leak free for a couple hours and then the leak shows again. I have given up on this crankshaft and have a replacement being machined with the specific request that the seal surface be, as close as possible, concentric to the journal and right at the upper limit of diameter range. I should know mid next week if this solves the problem. FWIW: I have had the pan on and off this engine so many times; I am considering using Velcro in place of the bolts when I put it back together.
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05-17-2013, 09:48 AM | #33 |
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Re: More questions of fixing a rear main oil leak
James, the valve train is lubricated three ways. First, there is a .055" hole drill in the base of the pressure relief valve to continually spray oil to the rear of the valve chamber. Second, any oil with pressure over 35 PSI is released into the valve chamber by the pressure relief valve. Since I am running the Stipe oil pump which produces in excess of 45 PSI with engine speeds over 1000 RPM's, there's plenty of oil in the valve chamber. The third source of oil is another .055" oil spray hole, but this one is directed at the rear of the camshaft timing gear (see photo). The hole sizes were arrived at by trial and error to achieve an idle oil of 20 PSI. The holes started out with 5/32"with less then 5 lbs idle oil pressure.....................now both are .055" and 25 lbs idle pressure.
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AL in NY Last edited by AL in NY; 05-19-2013 at 09:24 PM. |
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