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Old 11-05-2013, 09:08 PM   #1
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Cam Bearings or Oil Pump

Hello all I'm seeking some advice. I have an '02 wrangler 4.0L five speed and I am losing oil pressure at idle and gaining it while driving. On a mechanical gauge I am reading around 7lbs at idle. I have replaced the pressure switch before using the mechanical gauge so I know that isn't the problem. I am considering replacing the pump but I am afraid the cam bearings could be the reason for lost pressure as well. If it is the cam bearings what all would I have to do in order to replace those and get my engine back to a more optimal oil pressure. Thanks for any help in advanced! Also how much will the machining etc cost?

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Old 11-05-2013, 09:13 PM   #2
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A general rule of thumb is 10 PSI per 1000 rpms is acceptable. That would make 7 PSI acceptable if you are idling around 700 rpm. How many miles do you have? What kind of oil are you using?

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Old 11-05-2013, 09:27 PM   #3
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just under 130,000 miles with conventional 10w-30
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Old 11-05-2013, 09:28 PM   #4
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I know that is a pretty good rule of thumb but I feel like it would cause more internal wear than what it was idling at when i first purchased it at 87,000 miles
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Old 11-05-2013, 10:41 PM   #5
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What does it run when it is turning 2000? On hot days mine will dip to 10 at idle, but at 2000 I have 40+ and it has been fine.
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Old 11-05-2013, 11:22 PM   #6
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It's about 35 to 38 around 2k rpms. I was just curious what caused my dip in pressure over the last 30,000 miles. I also want the most pressure for long idling and off camber times where oil is shifted in the engine. I'm just curious what made me go from 50-60 lbs to 25-38 lbs while driving at higher rpms
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Old 11-06-2013, 05:02 AM   #7
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Quote:
Originally Posted by Rubber02Duck View Post
It's about 35 to 38 around 2k rpms. I was just curious what caused my dip in pressure over the last 30,000 miles. I also want the most pressure for long idling and off camber times where oil is shifted in the engine. I'm just curious what made me go from 50-60 lbs to 25-38 lbs while driving at higher rpms
now you have to be honest when answering this question.... How many miles between oil changes do you wait. Thinner oil will not build as good of pressure. Oil thins out as it breaks down from use.
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Old 11-06-2013, 09:43 PM   #8
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It doesn't get changed right at 3,000 miles. It does always get changed before 4,000 miles though. I just added Lucas Oil Stabilizer this last oil change and the pressure is higher at first start, highway speeds, and at idle. Makes me curious why a thicker substance is helping. I don't really want to run a thicker weight oil though.

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