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Unread 04-25-2013, 07:14 AM   #1
psych
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identify my oil leak

OK folks, time to play a game. I have an oil leak. I have been told several different "ideas" of what it could be, but I figured I'd come to the jeep pros for more help.

The leak has been around for awhile and I'm still trying to clean up from it to see if I can find it that way, but here's what I have.

1987 YJ, 4.2 manual tranny...oil all down passenger side, from valve cover, all the way down and back along passenger side under the jeep. Minimal oil on driver side. I see oil drip from the bell housing area, as well as, from under the engine. It only leaks when the motor heats up and once it cools, the leak stops. No noticeable loss on the dipstick, even with a good bit of oil on the ground. When I bought it, I was told there was a rear main leak, but with all the oil up top and in the engine compartment, I was told it was a valve cover issue and just leaking down to appear as a rear main.

This is where you all come in...thoughts, opinions, ideas...Think it could just be a valve cover and it's leaking enough to mimic a rear main or is it both? Any other options, maybe oil sending unit, etc?

I've read through the forum and have some ideas, but everyone's situation is different and I keep getting different answers.

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Unread 04-25-2013, 07:50 AM   #2
Pawjob
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Same issue as, my XJ, ZJ, and YJ has had. Go though and tighten up all you valve cover bolts see if that helps. That has solved the issue on all three of my jeeps.
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Unread 04-25-2013, 08:07 AM   #3
phil1330
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I'm gonna go wtih the turn signal fluid resovior. Those are a pain in the ***, and always leak.

Seriously ^^^^^^what PAWJOB said.
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Unread 04-25-2013, 08:23 AM   #4
psych
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I've had several people say the valve cover but would that dump that much oil? I'm learning as I go so I don't want to tear into something, IE the rear main seal, unless I have to.
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Unread 04-25-2013, 08:29 AM   #5
phil1330
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Quote:
Originally Posted by psych View Post
I've had several people say the valve cover but would that dump that much oil? I'm learning as I go so I don't want to tear into something, IE the rear main seal, unless I have to.
you won't know if the rear main is leaking until you stop the valve cover leak. Tighten the bolts down(i think its 15 inch pounds NOT FOOT POUNDS) then clean your motor with degreaser. then wait for the leak to resurface. Sounds exactly how my jeep acted when i first got it.
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Unread 04-25-2013, 08:30 AM   #6
Pawjob
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Yes it would leak that much. 4.0 have two major leaks, valve cover and rear main. Tighten the valve cover bolts it will cost you nothing and more then likely solve your issue.
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Unread 04-25-2013, 08:33 AM   #7
psych
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Sweet, thanks. I planned to replace the valve cover gasket and ensure proper torque on the bolts. This jeep is a great project but I'm learning how fickle they can be. Reminds me of military aircraft, they leak, no big deal....worry when it stops!
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Unread 04-25-2013, 10:38 AM   #8
Fernando
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What I do to find leaks is to clean all surfaces and start watching... you may have several leaks, but since oil gets all over it's difficult to pinpoint without cleaning
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Unread 04-25-2013, 10:52 AM   #9
HaskiE
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x2 on the valve cover gasket, that fixed it for mine, (or at least cut the leak way down)

my leak was so bad you could see it @ the oil pressure gauge, it would sit at 40-45, and when you revved/drove, it would go back to 60. now it sits at 60 consistently
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Unread 04-25-2013, 11:39 AM   #10
psych
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That's part of my problem. The previous owner didn't take very good care of the jeep and cleaning was obviously not in his vocabulary. I'm trying to clean as I also identify but it's not going as easy as I'd like and I'm trying to avoid just drenching the entire engine compartment! haha!


Quote:
Originally Posted by Fernando View Post
What I do to find leaks is to clean all surfaces and start watching... you may have several leaks, but since oil gets all over it's difficult to pinpoint without cleaning
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Unread 04-25-2013, 05:25 PM   #11
black92renegade
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Gravity Rules, start at the top with the valve cover. BTW it does not take a lot of oil to make a mess.
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Unread 04-25-2013, 05:38 PM   #12
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Quote:
Originally Posted by HaskiE View Post
x2 on the valve cover gasket, that fixed it for mine, (or at least cut the leak way down)

my leak was so bad you could see it @ the oil pressure gauge, it would sit at 40-45, and when you revved/drove, it would go back to 60. now it sits at 60 consistently
It doesn't matter if you don't have a valve cover on at all.
The oil pressure is determined by the oil pump and bearing clearance.

Dwayne
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