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Old 05-09-2015, 10:07 PM
kevins90xj kevins90xj is offline
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Default 90 xj 4.0 oil pressure problems

Ok so I put a mech oil pressure gauge in the other day due to the stock one not work right and have been concerned with the tapping at idle, so cold after start up I show 25-30 psi, after its warm at idle I have 0 rev it up to a of 1500 and I get 15-20 psi but will not go any higher, also the tapping goes away with more rpms most of the time. If read bad/worn out oil pump, or bad bearing clearances. And help or information is greatly appreciated
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Old 05-09-2015, 10:42 PM
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Default Re: 90 xj 4.0 oil pressure problems

I'm not an engine guy, but wish you the best of luck. It could be any or all of the things you have listed.
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Old 05-10-2015, 06:49 AM
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Default Re: 90 xj 4.0 oil pressure problems

If I had to guess I would say bearing. Not knowing the mileages and how good you were with oil changes. Will be a factor in my guess.
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Old 05-10-2015, 07:39 AM
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Default Re: 90 xj 4.0 oil pressure problems

have you tried a different kind of oil?
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Old 05-10-2015, 08:29 AM
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Default Re: 90 xj 4.0 oil pressure problems

Kev, had that issue with the willys and the new oil press sensor...read 15-20...but as I have hydraulic lifters, and no valve clatter, am taking it that my pressure is ok, and will regulate with oil changes. If I had to guess, based on what you've said, bearings would be my answer. a new oil pump may help a little, and is the cheapest way to eliminate the issue, maybe a high volume one, if there's one available. The alternative is to....well....you know...
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Old 05-11-2015, 09:25 PM
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Default Re: 90 xj 4.0 oil pressure problems

Quote:
Originally Posted by kevins90xj View Post
Ok so I put a mech oil pressure gauge in the other day due to the stock one not work right and have been concerned with the tapping at idle, so cold after start up I show 25-30 psi, after its warm at idle I have 0 rev it up to a of 1500 and I get 15-20 psi but will not go any higher, also the tapping goes away with more rpms most of the time. If read bad/worn out oil pump, or bad bearing clearances. And help or information is greatly appreciated
Dropping to zero when it warms up is a real concern. Did it start happening suddenly or has it been heading this way for a while? What oil filter do you use (bypass valve can do it)? Maybe somebody around here has an inspection camera you can borrow to get a peek inside the drain plug
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