RMS Leak Worse After Replacement
Just replaced the RMS and oil pan gasket on my ‘98. On first start up I didn’t see any leaks but after driving it it’s leaking worse. Guess I’ll go tackle it again. I followed all forum posts and videos. Where could I have gone wrong? Warped oil pan? Can you install the RMS backwards? Is there some special way I need to install the oil pan? I have to take it to go snowboarding tomorrow so I’ll just keep and eye on the oil level during the 4 hour trip then tackle it after but wanna make sure I don’t have to do it a 3rd time
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Joined: Aug 2020
Posts: 2,142
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From: SoCal
Year: 1988
Model: Cherokee (XJ)
Engine: 4.0L
The half in the cap only goes in one way but you may have inserted the other backwards, Did you put any sealant on the designated area of the cap?
What oil pan gasket did you use? Felpro make a 1 piece gasket.
What oil pan gasket did you use? Felpro make a 1 piece gasket.
CF Veteran


Joined: Dec 2016
Posts: 1,755
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From: Long Island, New York
Year: 2001
Model: Cherokee (XJ)
Engine: 98 stroked 4.7
The hard part of a RMS replacement is the half that goes around the upper part of crank, not the part in the bearing cap. And as stated prior...you need to put the silicon where required by the manual. Did you use the newer blue felpro oil pan seal, with the seal and pan holders...makes the job easy...PS, Ive built 4 or 5 motors...never had a RMS that didnt leave a small stain within a month of replacement....if it don't leak...your out of oil.
Last edited by bluejeep2001; Feb 2, 2024 at 08:23 PM. Reason: Info
Senior Member




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Posts: 979
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From: North East USA
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
...... Or if you dinged up the crank when removing the top half of the seal you can get accustomed to it leaking.
Have never understood the obsession with replacing RMS. My "RMS leak" mostly went away when I replaced the seeping oil pressure sensor, funny how that works. I consider the residual slight leak rustproofing.
Have never understood the obsession with replacing RMS. My "RMS leak" mostly went away when I replaced the seeping oil pressure sensor, funny how that works. I consider the residual slight leak rustproofing.
CF Veteran


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From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
I used to use a piece of cardboard strategically placed on the ground. I have since changed to a 2' x 2' square of OSB which doesn't get destroyed when it gets wet, doesn't blow away, etc.
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Joined: Dec 2016
Posts: 1,755
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From: Long Island, New York
Year: 2001
Model: Cherokee (XJ)
Engine: 98 stroked 4.7
So Dave51, i assume that means you leak all the time...my wife makes me park in the street..like i stated earlier...if your not leaking...your out of oil
I’m thinking my main problem is installing it backwards at this point. About to tackle it again next week and I’ll know for sure. Just want to confirm does RTV or anerobic sealer go on the edge of the bearing cap? Or nothing at all on there? Te guide I followed said to put Rtv on the ends of the seal, looks like that was wrong.
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Joined: Sep 2016
Posts: 979
Likes: 481
From: North East USA
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
I’m thinking my main problem is installing it backwards at this point. About to tackle it again next week and I’ll know for sure. Just want to confirm does RTV or anerobic sealer go on the edge of the bearing cap? Or nothing at all on there? Te guide I followed said to put Rtv on the ends of the seal, looks like that was wrong.
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