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Guest
Anonymous Poster
dusty_roads67@yahoo.com
Jul 23, 2009, 5:02 AM
Post #1 of 7
(2718 views)
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I have a 1996 chevy 4x4 truck, 350 5.7, Leaking oil from around the transmission housing, looks like the rear main seal maybe. Someone told me that if your oil pressure rises when decelerating then it is definite the rear main seal. Can anyone confirm this wise tail?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 23, 2009, 5:06 AM
Post #2 of 7
(2715 views)
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That makes no sense at all. There isn't even any relationship between a rear seal and oil pressure.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
Jul 23, 2009, 12:27 PM
Post #3 of 7
(2709 views)
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Yes, the rear main seal may be leaking. But, you should have the engine pressure washed, put some dye in the oil and then look for the origin of the leak. Could be the intake manifold gasket, oil pressure sending unit, valve cover gaskets, ect. Hammer is correct, as usual, that oil pressure has absolutely no bearing on the leaks. Well, the oil pressure sending unit is under pressure, but that's about it. The rear main seal is a one-piece seal. You'll either have to remove the engine or the transmission to replace it. (removing the trans is the preferred way).
Loren
SW Washington
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 23, 2009, 12:51 PM
Post #4 of 7
(2707 views)
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Let me clarify what I really meant. The seal cannot effect the oil pressure but the oil pressure can exaggerate the leak. That's the only connection.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
Jul 23, 2009, 12:59 PM
Post #5 of 7
(2701 views)
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Wouldn't the rear main be just a gravity leak? Can't imagine oil pressure having anything to do with it. I was wrong once before.
Loren
SW Washington
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 23, 2009, 1:07 PM
Post #6 of 7
(2697 views)
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It would have higher flow at the rear main bearings. Wouldn't be a big effect but I think it would have some effect.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
Jul 23, 2009, 1:12 PM
Post #7 of 7
(2690 views)
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Entirely possible. Maybe an oil pressure test is in order? Stuck check valve?
Loren
SW Washington
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