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Satakieli
Dodge Dakota
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8/04/2005
15:50:49
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 Subject: Rear main seal
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Message:
Im having some serious issues in my 88 with a 360 race motor. Im not understanding whats causing this. THe pcv valve is in good order and it is opening when it should. I took her to the track and was doing alright considering i havent opened her up all the way. The first time i went WOT i immediately saw my oil psi drop drastically with a lot of clutch slippage. What on earth caused my rear main to blow with a fully functioning PCV?
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98Dyd
Dodge Dakota
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8/05/2005
08:52:29
|  RE: Rear main seal
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If you are getting a lot of blowby past the rings, the PCV may not be able to keep up and the crankcase pressure builds up. You might want to do a compression and leak down tests. Maybe a breather in the valve cover would help?
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satakieli
Dodge Dakota
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8/05/2005
13:45:42
| RE: Rear main seal
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Message:
i tried a leak down results were fine and a breather is installed. could the oil pump cause this considering i rev it up to just under 7000?
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OBIO3
Dodge Dakota
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8/05/2005
15:33:16
| RE: Rear main seal
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Message:
Going with what info you mentioned and baring a defective seal, yes the oil pump can cause this IF you have a high volumn pump and installed a stiffer relief spring in it > I made this mistake once on a chevy engine I installed in a 64 CJ5 > Faster I went the higher the oil presure was > Guage registered 100 and I could peg that easy
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OBIO3
Dodge Dakota
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8/05/2005
15:35:31
| RE: Rear main seal
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Message:
Forgot > Yes I blew the rear main seal out lol
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satakieli
Dodge Dakota
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8/06/2005
16:38:44
| RE: Rear main seal
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Message:
Pardon the stupidity but besides replacing the pump outright is there anything else i can do?
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OBIO3
Dodge Dakota
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8/06/2005
19:45:36
| RE: Rear main seal
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Message:
Before you jump on the pump with both feet, check the actual preasure with a mechanical guage > Know your right prior to tearing things apart
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satakieli
Dodge Dakota
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8/10/2005
16:04:39
| RE: Rear main seal
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Message:
it runs 125 psi at 7000 rpm.... thats a little to high right? could it be cause by a clog? not real sure i normally just replace em on stock cars
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OBIO3
Dodge Dakota
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8/11/2005
17:47:30
| RE: Rear main seal
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Message:
Not sure what your doing at 7000 > I assume you built this engine up and as a rule this does include a high volumn pump > So again > Did yoU PUT A STIFFER SPRING IN IT > Your loi filter relief valve should open long before 125 unless your running a filter with no reliefe valve > your not going to get 125 pounds out of a stock pump > Don't worry to much about it anyway > at 7000 revs the engine won't live very long unless it is actualy built up to handle this on a regular basis
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satakieli
Dodge Dakota
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8/12/2005
20:04:42
| RE: Rear main seal
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Message:
Its a race motor with a balanced crank. Yes it does have a high volume pump. Ok so the spring i installed in the oil pump is causing this? so what then replace it with a softer spring right?
Btw since it is for racing, i expect to have to rebuild it constantly.
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OBIO3
Dodge Dakota
JOIN HERE
8/12/2005
23:39:14
| RE: Rear main seal
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Message:
There's your answer > Myself, I would use a new stock pump > If you do use the heavy duty it should have come with more then one spring > Use the lightest one it came with > Stock will give a good rebuilt engine 60 to 80 pounds of preasure > The heavey duty with light spring depends on manufacture but should still out perform stock > Where the heavey duty comes into it's own is being able to pump the oil needed into a race lose built engine > Your really not interested in pushing more preasure > You also must change the seal
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