low oil pressure
05-20-2010, 11:53 PM
#1
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Year: 1990
Model: Cherokee
Engine: 4.0
low oil pressure
I have low oil pressure in my 4.0L. It starts at 50-60 cold, then after the engine is good and warm it drops to 20-30 driving, and 15-20 at idle.
I have put crank and rod bearings in. Also I put a new oil pump in. I am running 10W40 and thinking of going to 20W50.
I was thinking it might be the oil pressure relief valve. But I cant find any listing for it. Does anyone know where the pressure valve is on the 4.0L.
It is a 1990 JEEP CHEROKEE LOREDO 4.0L with an automatic.
Please Help...
I have put crank and rod bearings in. Also I put a new oil pump in. I am running 10W40 and thinking of going to 20W50.
I was thinking it might be the oil pressure relief valve. But I cant find any listing for it. Does anyone know where the pressure valve is on the 4.0L.
It is a 1990 JEEP CHEROKEE LOREDO 4.0L with an automatic.
Please Help...
05-21-2010, 12:19 PM
#3
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Location: Wy & OK
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Year: 83 CJ7 & '96 XJ & '97 XJ
Model: Cherokee
Engine: 258ci, 4.0 & 4.0
Not sure what year you have but the recommended oil for the Cherokee is 5W-30 in cold weather and 10W-30 in Hot.
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