Oil Pressure

T

thegspot

NAXJA Forum User

Location

New York

• Apr 6, 2013

• #1

Hi my name is Gary this is my first post. I have a 2000 Cherokee 4.0 auto with 130000 miles on it. The oil pressure drops after driving but come up somewhat when accelerating ? Any help would be appreciated

 

Last edited: Apr 6, 2013

tjmotter

NAXJA Forum User

NAXJA Member

Location

Texas

• Apr 6, 2013

• #2

That is pretty normal. The Haynes service manual says that it should not drop below 13psi. If it drops lower than this you will need to look at replacing the oil pump. I just did this on mine ('90 XJ with 195000 miles) and it isn't too bad of a job (but messy).

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Apr 6, 2013

• #3

Oil pressure spec. for the Jeep 4.0

*Not less than 13 psi at HOT idle

*Between 37-75 OVER 1600 rpms

 

G

Gnarlyrider27

NAXJA Forum User

Location

Coarsegold CA

• Apr 7, 2013

• #4

My 92 with almost 250,000 at start up is about 50 psi and after it warms up drops it like 40 psi tell I put it in gear then drops to 25 or so but never drops below 20 psi. Thats with fresh oil lol and after like 500 miles the readings are little different at start up and stuff.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Apr 7, 2013

• #5

For The World:

Whenever you drop the oil pan on the 4.0 you should re-torque the crank and rod bearing caps--they come loose.