High oil pressure on CJ8??? - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 01-03-2002, 10:47 PM
Posts: n/a
High oil pressure on CJ8???

Guys, good bud just had his 258 rebuilt in his scrambler. Now whenever it runs, say around 45 or 50 or whatever, the oil pressure gauge is reading extremely high, almost all the way to the right at 80. What causes really high oil pressure, and what can it hurt?? Also, what should an engine of this size normally run while running and idling??? Thanks guys, Mike. PS Going to look at CJ this sat, will report back on how she is??

85 Bronco XLT, 351W H.O.
32" Big O At's on stock susp.
True dual flomaster 40 series mufflers.
CJ trail rig on the way!!
"When in doubt, HAMMER DOWN SON!"
Sponsored Links
post #2 of (permalink) Old 01-04-2002, 06:22 PM
Join Date: Oct 2001
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
Re: High oil pressure on CJ8???

Wierd, I always understood the 258 to have lower oil pressures. My Scrambler 258 rebuild w/75K runs around 20. The main bearings could be too tight, there could be a high-flow oil pump in there, or blocked oil passage somewhere. Of couse, I would go the cheap route first and hook a mechanical oil pressure guage with the plastic line in place of the electric oil pressure sender and confirm the high oil pressure. Then if it is that high, go talk to the rebuilder and see what he put inside the engine. I've never heard of a 258 having that high of oil pressure. Also, make sure there is regular oil in there and not gear lube.

kansasjeeper is offline  
post #3 of (permalink) Old 01-04-2002, 06:30 PM
Join Date: Jun 2001
Posts: 1,628
Thanks: 0
Thanked 0 Times in 0 Posts
Re: High oil pressure on CJ8???

Could be a plugged passage somewhere, bearings too tight, or posssibly a bad guage. Might won't to see what kind of reading you get with a mechanical guage. Also make sure he's running 5-30 in it and not 20-50 or something.

-Derek Schwab
'97 Sidekick Sport
'83 CJ-7
dschwab9 is offline  
Sponsored Links
post #4 of (permalink) Old 01-04-2002, 09:46 PM
Join Date: May 2001
Posts: 1,271
Thanks: 0
Thanked 0 Times in 0 Posts
Re: High oil pressure on CJ8???

I had the same problem on mine when I first rebuilt it. The FIRST thing to check before you get all crazy is the Oil filter nipple.

1) Take the filter off.

2) There is a large nut holding a retainer plate on (mine was 22mm, but that changes from year to year). Remove the nut and BE CAREFUL.

3) When you pull the retainer plate off, there will be a spring, and a piece of waffle-board/plastic that come out.

4) Make sure that the setup is assembled properly. Sometimes they will get the plastic piece cockeyed or not put one in there at all.

5) I BELIEVE (don't hold me to it, and SOMEBODY double-check me with the FSM, please) the spring/waffleboard should be assembled in the following manner: Waffboard in first into the block, then the spring, then the plate.

If anything is wrong with this assembly, then it could give you the symptoms you described.

Also of note, if he traded his core in on a rebuild, then there is a possibility they have traded the SAE nipple for the oil filter for a METRIC nipple. The symtom exhibited here is that the filter will screw on and tighten as you would expect, but will eventually be blown off the block (making a HELL of a mess).

'83 CJ-7 nothing original but the tub and axle tubes
bluseman2a is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome