Did i mess up the rear main?

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Mar 13, 2010 | 12:54 PM

MUSTANGBRKR02

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Did i mess up the rear main?

I didn't have my catch can system installed properly so i was pushing boost into the crankcase a few times. I got the catch can issue resolved but i am still leaking oil out of the rear of the engine. Think i damaged the seal? Is there anywhere else it could be coming from back there? I really don't want to pull the transamission again. If i do everything is coming out to get built.

Mar 13, 2010 | 01:29 PM

XtremeDime

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Damn that sucks. How did you have your catch can routed?

Mar 13, 2010 | 03:19 PM

MUSTANGBRKR02

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Now it's fixed but i was missing a check valve. Now i am running a dual catch can set-up.

Drivers valve cover to vented catch can, then from catch can to pass rear valve cover.

Front of pass valve cover to pcv valve to catch can, then from catch can to check valve then to intake port

Capped off the TB port. Not running a line to the inlet either.

Mar 13, 2010 | 03:24 PM

lmt0705

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how much boost were you running? its possible you pushed the rear seal out

Mar 13, 2010 | 03:26 PM

XtremeDime

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Ah so you forgot the check valve in between the can and manifold. That sucks alot man, I hope its nothing serious. I hope my PCV system works, it looks fine on paper.

Mar 13, 2010 | 03:39 PM

MUSTANGBRKR02

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Most it saw was a spike of 6 at the manifold. but average of 5 #'s for very short pulls.

Mar 13, 2010 | 05:54 PM

lmt0705

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that doesent seem like it would be enough to push a seal. people run more than that on stock engines with no catch can and have no issues including myself on my first setup

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Mar 13, 2010 | 07:05 PM

lmt0705

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Dont remember, it was a while ago. Only thing I might have done was have a breather on the oil cap back then

Mar 13, 2010 | 07:08 PM

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lmt0705

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just reread his post, yeah thats a different situation then what I had. I wasent pressurising my crankcase with a catch can setup

Mar 13, 2010 | 08:18 PM

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MUSTANGBRKR02

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Yeah i am just hoping it is someplace else leaking. I found a leak on the oil block, but the oil is dripping off of the converter area (4l80). Hopefully it's just getting pushed back there by wind.

Mar 14, 2010 | 11:23 PM

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BJC51984

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Chased this same issue for a while too, mine ended up being the valve covers were not sealing right, took them off and reinstalled them, and tat took care of things

Mar 15, 2010 | 07:27 AM

#13

MUSTANGBRKR02

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I will check into that. Thanks.

Mar 15, 2010 | 04:50 PM

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Jimmy P

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Stick your hand behind there and touch all over the back of the valve covers and heads. Valve cover leaks are prety common.
Not sure if there is much truth to this, but I was told that if you keep on messing up rear main seals it could mean the crank shaft isnt properly balanced.