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Rubber side down 05-19-2012 04:15 PM

Oil leak of unknown origin...Help
Hey everyone, I have a 95 YJ with the 4 cyl. Last night I shut it off and oil POURED out of it. Filled it back up and limped it home to my garage. Cleaned it all up this morning so I could see where it was coming from. Started it up and crawled under it, and it looked like it was coming out of the passenger side of the oil pan at the gasket, about midway down the pan. Figured the pan gasket had failed, so I spent the better part of today replacing it. Fired it up and took a spin. Pulled back in the driveway and shut it off, and PUKE: oil POURING out of it still, in the exact same spot. A closer look shows that it may actually be coming from higher up, but I can't see where. The head gasket is good, no oil in the coolant or visa-vera. Very discourgaed. Anybody got any ideas? Could the block be cracked? I can't see in there because of the motor mounts (this seems to be the general area that it originates). If so, how does this just happen unexpectedly without provocation? Can it be repaired? Any insight would be greatly appreciated.

banks316 05-19-2012 06:24 PM

Two things I think it could be. The seal on the oil filter mount. You use a torx bit to remove that housing and there's two o ring seals. One on the outer housing, other on the ons of the bolt you unscrew. Second is the oil pressure sending unit.

Rubber side down 05-19-2012 06:30 PM

Would either of these things account for the widely varying oil pressure readings? I forgot to mention that in my original post. The oil pressure keeps fluctuating erratically. I didn't know if this was due to the leak itself, or if it was being caused by the cause of the leak. The oil pressure jumps up to 80 and then will drop down to 40 and back again, at an idle.

If it is one of these things you mention, is it something that can be done by a moderately skilled, fairly well appointed in the tool department, weekend warrior mechanic in a day, or is it best addressed by my mechanic?

brentd711 05-19-2012 07:31 PM

Ten minute job. Unscrew the old sensor, install the new one.

Rubber side down 05-19-2012 08:36 PM

Thanks. What about the oil filter mounting seals? Been looking in my Clymer's manual and can't find anything on it.

banks316 05-19-2012 09:18 PM

Yes both can be easly done with common tools and skill.... the O rings the inner is just a standard ring the outer is much bigger and a auto part store would have it or could order it.

Rubber side down 05-20-2012 07:06 PM

Hey, just wanted to thank you all for your help. It was the oil pressure sending unit and the fitting that screws into the side of the block was cracked. What a b@#% that was to get out. Anyway, its all better. Thanks again

banks316 05-20-2012 08:26 PM

Glad it was a cheap and easy fix

BAP 05-20-2012 08:59 PM

sorry that i was late seeing your post,,,thats one thing that i could have given mech.advice on-----ben there done that-----lol,,

Rubber side down 05-26-2012 09:59 PM


Originally Posted by banks316 (Post 2387881)
Glad it was a cheap and easy fix

Well, it was cheap, but definitely not easy. The damn fitting broke off in the block, and with about 2 inches between it and the motor mount, it was a real bear to get out and get the new one in. Either way, I am happy it is fixed and thankful for the info I got here, theat helped me find the problem.

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