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Old 10-16-2009, 12:35 AM   #1
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1998 Cherokee
Default Low oil pressure????

Hello, I'm new to the jeep thing. I have a 98 jeep cherokee with good oil pressure when it first starts up. It's at about 42psi, but once it warms up the pressure drops to about 10-12psi. Is this normal to have such low pressure? What should the psi be at? I use the recommended 10w30 when I do my oil changes and I'm worried my main and connecting rod bearings are worn out. It has a 6cyl 4.0 with 139000 miles. Could it be a bad oil pump? Any ideas would be helpfull. Thanks a bunch...

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Old 10-16-2009, 10:32 AM   #2
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Well mine sits at around 60 cold and 40 to 45 when warm. Your pump may be going.
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Old 10-18-2009, 01:53 AM   #3
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You need 10 lbs. of pressure for every 1000 RPM.

If you've got at least that, you're OK.
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Old 10-18-2009, 04:20 PM   #4
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With the engine cold and then warm reve the engine a few times and see if you hear any unusal knocking which would indicate bearing wear. My Oil pressure was low so I installed a high volume pump and now its 50-60 PSI cold, 30-35 at idel, and 40-45 when driving. Most likely a bad pump is my guess but you can put a mechanics gauge from Harbor Freight (about 10 bucks) on where the existing sending unit is and get a more accurate reading. I've read that 9-13 psi at warm idel is normal but the as low as 7 PSI is good enough. You want to be around 35-45 while driving at normal temp if not higher.
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Old 10-18-2009, 04:20 PM
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