what is the correct oil pressure in a 258? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > what is the correct oil pressure in a 258?

XJ Rail Sale!The Ruffstuff NOT Universal 4 Link Kit!Vanco Big Brake Kit Promotion!

Reply
Unread 09-28-2011, 09:04 AM   #1
mulliflier
Registered User
1984 CJ7 
 
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 144
what is the correct oil pressure in a 258?

I read somewhere that it was higher than you would think, like 75 psi. Wondering what you shuld expect at idle and then at part throttle (about 2K RPM).

Just wanted to verify that so I can put some tape marks on my aftermarket gauge.
Thanks!

mulliflier is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 09:33 AM   #2
keith460
Jeep. There's Only One
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 4,975
FSM states: 13psi @ 600rpm (idle) and 37-75psi @ 1600+ rpm. 75psi max. Pressure relief valve will open after 75psi.
__________________
.
1984 CJ-7 Renegade
__________________

Restoration Thread:http://www.jeepsunlimited.com/forums...d.php?t=434226
keith460 is online now   Reply With Quote Quick reply to this message
Unread 09-28-2011, 09:54 AM   #3
zeronight
Registered User
1982 CJ7 
 
Join Date: May 2009
Location: Festus,MO
Posts: 379
i normally have seen just over 10 at idle on my factory gauge and close to 35 at speed.
zeronight is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 09:57 AM   #4
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,691
Mine idles at about 18-20 and 40-50 under load, on the factory gauge.

Matt
Matt1981CJ7 is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 02:15 PM   #5
82JeepCJ7
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 4,972
10psi per 1000rpm is a good rule of thumb.
__________________
Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
82JeepCJ7 is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 06:04 PM   #6
Falcon_CMH
Member
 
Join Date: Sep 2011
Posts: 458
My CJ-7 starts cold at ~60-65 PSI idle. Then after it's warm it idles at ~20 PSI. Once the gas is applied it goes ~60-75 PSI depending on how much gas, steady gas it's at ~65 PSI. The RPM doesn't seem to matter. I recently replaced my rear main bearing seal (new oil pan seals all around too) and use 20w50 Castrol oil (white). I have a AMC 304.
__________________
Bought a 1980 CJ-7 that I am rebuilding ground up: http://www.jeepforum.com/forum/f8/my...thread-1264945
Given 6 hours to chop down a cherry tree a famous person once said I would sharpen my axe for 5 hours.
Falcon_CMH is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 08:49 PM   #7
Nereussailor
Registered User
1984 CJ7 
 
Join Date: Sep 2010
Location: Vero Beach, Florida
Posts: 601
I just rebuilt mine and it's running 35 at idle and 65 at 2000rpms after it's fully warmed up.
__________________
I'm not sure what tomorrow will bring, but it can't be any worse than what I've already been through.
Nereussailor is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 09:21 PM   #8
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 4,630
Gauge shows 45psi at speed but being a cheap piece of Chinese crap mechanical gauge who knows what it means. At least I get the pleasure of knowing the needle moves.
__________________
BagusJeep lives in Bali, the Land of Temples.
With a Jeep every prayer counts.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline   Reply With Quote Quick reply to this message
Unread 09-28-2011, 10:04 PM   #9
mulliflier
Registered User
1984 CJ7 
 
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 144
Excellent, thanks for all the help guys!
mulliflier is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.