I just bought a 91 xj with a high output 4.0L and the pressure is reading 80 PSI at Idle. I replaced both the gauge and sending unit with no results. i than hooked up a mechanical gauge and found the pressure was still reading about 70 PSI at idle. So now I've been told to check the oil pressure release valve, but i have no clue where its located. if anyone knows where it is or has a suggestion about my high oil pressure feel free to respond.
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Where's the oil pressure release valve?
- Thread starter low&slow
- Start date
old_man
NAXJA Forum User
- Location
- Loveland, Colorado
Replace the oil filter. NO Fram.
cherokee chuck
NAXJA Forum User
- Location
- freeland,wa usa
the bypass valve is under the torx head on the filter adapter. is this what they are refering to?
lawsoncl
NAXJA Forum User
- Location
- North Idaho
old_man said:
While I would agree with the anti-Fram crap sentiments, I don't think the oil filter can be blamed for high oil pressure. The sender is after the filter. The FSM sites clogged filter as a possible cause for low oil pressure.
The pressure relief valve is in the oil pump, with a max pressure of 75-psi. Is it always high, or just when cold? If it's just when cold I wouldn't worry too much about it, other than perhaps making sure to use the correct weight oil.
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