• NAXJA is having its 18th annual March Membership Drive!!!
    Everyone who joins or renews during March will be entered into a drawing!
    More Information - Join/Renew
  • Welcome to the new NAXJA Forum! If your password does not work, please use "Forgot your password?" link on the log-in page. Please feel free to reach out to [email protected] if we can provide any assistance.

Jeep XJ Oil Pump

KellyBuilt

NAXJA Forum User
Location
Oklahoma
Hey there, so I just got a non running 1990 Jeep XJ. Previous owner said it ran good then quit and acted like it was out of time when he went to turn it over. I brought it home, put a new battery in it and sure enough it sounds like it out of time. He thought maybe the timing chain had broke, I did alot of research and cleaned all the grounds I could find, installed a new starter and cleaned up the cap and rotor and installed new plugs and its still doing the same thing. Today I decided to pull the distributor and where the bottom of the distributor goes into the oil pump is broken I believe. Does the motor need rebuilt or can I just put a new oil pump in?
Picture I found.
https://i.imgur.com/6HHHSJp.jpg
What mine looks like, I can move the pin all around

https://i.imgur.com/A7YWI47.jpg
 
Drop the oil pan. Take care to look at the oil. Drain it through a coffee filter. You are looking for chunks of metal or excessive "glitter" in the oil.

I would replace the oil pump. Stay away from the Melling high output. Many have expressed problems with them.

If the pin on the distributor gear sheared, there is really only one thing that can cause it...a seized oil pump. While there drop a couple of main and rod caps and take a quick look at the bearings. This should give you are very good idea about the state of the engine.

A broken timing chain will NOT cause the pin to shear. The only thing that gear drives is the distributor and oil pump.

If you have a rear main oil seal, now is the perfect time to spend $20 for a seal and fix it.
 
I'm definitely going to pull the oil pump today or tomorrow and check everything out. I dont believe the pin is sheared? With the plugs out of the motor it should turn over fairly easily with a breaker bar and socket right? Cause it seems too hard to move.
Heres a pic of my distributor
http://imgur.com/gallery/ABP2gOx
 
Yikes, hope you didn't pay much .
Hard to believe it still ran, missing a connecting rod should have killed the oil pressure and all the bearings, the lifters should have been rattling.
From the looks of the oil pan, the engine was in trouble before it broke .
 
You might be way beyond a simple rebuild if it was running without oil pressure for a while, and if that broken rod tore anything up. I'd look for a used or rebuilt motor before I put any time or money into that one.
 
Yep, that'll cause a misfire. :doh:
 
Dead hole anyone?...lol

X2 on the find a different engine. At a minimum I would replace the short block.
 
Back
Top