oil pressure problem
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Junior Member
Joined: Jan 2011
Posts: 49
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From: New Bern NC
Year: 1992
Model: Cherokee
Engine: 4.0 straight 6
oil pressure problem
if the cam bearings are bad I will lose oil pressure, right?
however the volume of oil flow should still be present or I think so, not sure how it all works.........but my question is this. oil pump is new and still losing pressure but if you remove the valve cover with engine running im not seeing much oil in that area. its running pretty dry compared to what ive seen in other engines. why? what could be clogged up or will the cam be the cause of this........?? the oil pump is a NEW high volume pump. thought that would fix it but ohwell....$80.00 wasted. 92 cherokee sport 4.0 i6ho
however the volume of oil flow should still be present or I think so, not sure how it all works.........but my question is this. oil pump is new and still losing pressure but if you remove the valve cover with engine running im not seeing much oil in that area. its running pretty dry compared to what ive seen in other engines. why? what could be clogged up or will the cam be the cause of this........?? the oil pump is a NEW high volume pump. thought that would fix it but ohwell....$80.00 wasted. 92 cherokee sport 4.0 i6ho
Senior Member
Joined: Jan 2011
Posts: 801
Likes: 1
From: N. IL
Year: 2000
Model: Cherokee
Engine: 4.0
I wonder if you got the oil pick up tube on correctly..... did you try reusing the old pick up tube on your new pump?
Last edited by DaddyCat; Mar 19, 2011 at 09:44 AM.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
if the cam bearings are bad I will lose oil pressure, right?
however the volume of oil flow should still be present or I think so, not sure how it all works.........but my question is this. oil pump is new and still losing pressure but if you remove the valve cover with engine running im not seeing much oil in that area. its running pretty dry compared to what ive seen in other engines. why? what could be clogged up or will the cam be the cause of this........?? the oil pump is a NEW high volume pump. thought that would fix it but ohwell....$80.00 wasted. 92 cherokee sport 4.0 i6ho
however the volume of oil flow should still be present or I think so, not sure how it all works.........but my question is this. oil pump is new and still losing pressure but if you remove the valve cover with engine running im not seeing much oil in that area. its running pretty dry compared to what ive seen in other engines. why? what could be clogged up or will the cam be the cause of this........?? the oil pump is a NEW high volume pump. thought that would fix it but ohwell....$80.00 wasted. 92 cherokee sport 4.0 i6ho
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
CF Veteran
Joined: Sep 2010
Posts: 4,968
Likes: 0
From: Salt Lake City, UT
Year: 2000
Model: Cherokee
Engine: 4.0L
Bearings being worn Mains/cam will cause the oil to bleed off past the bearings caused by the bigger openings. which means pressure and volume are lost at the bleeding point, and everything after will suffer from starvation.
when I rebuilt my engine for this issue my cam bearings where ovaled out and the cam could flop around. had to buy a cam and lifters on top of everything elss due to the starvation of oil, my mains looked great not a sign of wear at 140k. but do it all. its a lot of work. but even more if you have to do it twice. you can reuse the pump on the rebuild... or put it in a used motor if you choose to go that way...
not a great idea, but i didn't want to put an engine in mine for a year as i didn't drive it much then, so I put 20-50w oil in it and made sure it stayed cool. got about another 8-10k miles out of it without the oil droping past 7-8psi at idle hot and not more damage caused. but may not be so lucky...
when I rebuilt my engine for this issue my cam bearings where ovaled out and the cam could flop around. had to buy a cam and lifters on top of everything elss due to the starvation of oil, my mains looked great not a sign of wear at 140k. but do it all. its a lot of work. but even more if you have to do it twice. you can reuse the pump on the rebuild... or put it in a used motor if you choose to go that way...
not a great idea, but i didn't want to put an engine in mine for a year as i didn't drive it much then, so I put 20-50w oil in it and made sure it stayed cool. got about another 8-10k miles out of it without the oil droping past 7-8psi at idle hot and not more damage caused. but may not be so lucky...
CF Veteran
Joined: Nov 2010
Posts: 5,841
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
x2 this video will explain it pretty clear http://www.youtube.com/watch?v=8f2fcbTh5yw
Should be required viewing for anyone with a low oil pressure problem.
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CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
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