Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Register Forgot Password?
Register Photos FAQ Members List Social Groups Search Today's Posts Mark Forums Read GarageVendor DirectoryvBLive
Search

Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 10-15-2009, 11:35 PM   #1
Newbie
 
Join Date: Sep 2009
Posts: 7

View Mexikrainian's Photo Album My Photos
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...

Last edited by Mexikrainian; 10-15-2009 at 11:37 PM.
Mexikrainian is offline   Reply With Quote
Old 10-16-2009, 09:32 AM   #2
CF Veteran
 
troy fritz's Avatar
 
Join Date: Jul 2009
Posts: 2,447

View troy fritz's Photo Album My Photos
Send a message via AIM to troy fritz
Default

Well mine sits at around 60 cold and 40 to 45 when warm. Your pump may be going.
troy fritz is offline   Reply With Quote
Old 10-18-2009, 12:53 AM   #3
CF Veteran
 
Firestorm500's Avatar
 
Join Date: Apr 2009
Posts: 3,211

View Firestorm500's Photo Album My Photos
1987, 1992, 1997 Cherokee
Default

You need 10 lbs. of pressure for every 1000 RPM.

If you've got at least that, you're OK.
Firestorm500 is offline   Reply With Quote
Old 10-18-2009, 03:20 PM   #4
Member
 
Join Date: Feb 2009
Posts: 120

View 94sport's Photo Album My Photos
1994 Cherokee
Default

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.
94sport is offline   Reply With Quote
Old 10-18-2009, 03:20 PM
 
 
 
submit to reddit
Reply
Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
low oil pressure austm31 OEM Cherokee Tech 8 05-23-2010 01:26 AM
oil pressure ???? justin OEM Cherokee Tech 4 04-26-2009 10:47 AM
oil pressure 1997cherokee OEM Cherokee Tech 7 02-14-2009 09:11 PM
Oil Pressure and what not renodude19 OEM Cherokee Tech 5 02-01-2009 05:29 PM
oil pressure 2001xj OEM Cherokee Tech 7 01-28-2009 05:34 PM


All times are GMT -5. The time now is 06:16 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.5.2
This site is in no way affiliated with Jeep or Chrysler.

Emails Backup