rear main seal
05-18-2012, 11:02 PM
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I'd be looking up above first, and VERIFYING the source of the oil leak. . A leak at the back of the valve cover could produce the same symptoms. Don't jump on the RMS/oil pan gasket bandwagon just yet.
Almost any oil leak on your 4.0 is gonna drip from the RMS area for 2 simple reasons. First off, the engine sits nose-up and oil will run back to that area. Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber's adage apply here. "$hit flows downhill".
Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket have to be eliminated as possibilities first.
Revised 5-16-2012
Almost any oil leak on your 4.0 is gonna drip from the RMS area for 2 simple reasons. First off, the engine sits nose-up and oil will run back to that area. Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber's adage apply here. "$hit flows downhill".
Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket have to be eliminated as possibilities first.
Revised 5-16-2012
05-19-2012, 02:24 AM
#3
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Year: 1997
Model: Cherokee
Engine: 4.0
exactly as cruiser said. if you do find the leak to be your rms then a quick google search will get you a decent write up on it. good luck. its messy 
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