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high pressure oil pump for Jeep
- Thread starter atowley
- Start date
Yucca-Man
NAXJA Member # 683
- Location
- Castle Rock, CO
Why?
The stock pump works for 150-200,000 miles on most 4.0L engines
The stock pump works for 150-200,000 miles on most 4.0L engines
red91
NAXJA Forum User
- Location
- exact location unknown
Yucca-Man said:
what he said...I got 113k on mine and it still pushes 55-60 lbs running at 70-75MPH.
You need more than that???
Yucca-Man
NAXJA Member # 683
- Location
- Castle Rock, CO
In my thinking, more pressure internally means more leakage externally...I don't need any more reasons for the haters around here to mess with my rig.
- Location
- Terra Firma
Nobody makes a high pressure pump for the 4.0L that I'm aware of. Melling makes a high volume pump, but that's not what you're asking.
My '88 is at 245,000 miles and I still have good oil pressure with the original pump. I don't think you need a high pressure pump -- I think you need to replace the rod bearings.
My '88 is at 245,000 miles and I still have good oil pressure with the original pump. I don't think you need a high pressure pump -- I think you need to replace the rod bearings.
red91
NAXJA Forum User
- Location
- exact location unknown
Yucca-Man said:
Thinking the same. Something somewhere is bound to give...can't for the life of me figure out whats wrong with 50lbs of pressure. Never seen a oil related problem with motors like that...
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
atowley said:
What Eagle said. If you have worn rod/main bearings, the oil pressure will be low particularly when the engine's hot and at idle. What oil pressures are you running cold/hot?
If there's no knocking from the bottom end but the oil pressure's lowish, you could try a thicker grade of oil.
Yucca-Man said:
More like 300,000+ miles. I don't think I've ever heard of a stock oil pump needing replacement in a 4.0. I have seen pics of a broken high volume pump, aparently the shaft isn't as strong or something like that. Atowley - what is your current oil pressure? It's EXTREMELY common to have a bad oil pressure sender on this engine, so even if you're reading low it might just be that.
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
That's much too low. Try to get hold of a mechanical gauge to check the oil pressures. If those readings are confirmed, you'd better get ready to replace worn rod/main bearings.
KingA
NAXJA Forum User
- Location
- Colorado Springs
atowley said:
That's pretty low. I'm running similar pressures with a new Long Block that's a year old. The dealership put it in and it's under warrenty, but they say that range is fine. Just seems wrong to me...
Use a mechanical gague to make sure those are right before doing anything else. You'll definately need to do something if they really are that low.
