armmata

i just got a 1999 wrangler 4.0 motor for my 1991 jeep cherokee with an ax-15 tranny. Is there anyone who know where i can find a pilot bearing to fit this set up

5-90

Measure the crank bore (diameter and depth,) measure the pilot, take all measurements to your parts house.

There's usually a section in the back of a bearing catalogue that allows you to look up bearings by dimension, instead of by application - and this can be very useful (if the bearing company also makes bushings, they'll be back there as well.)

If you can't get the thing apart, go ask to look at both pilot bushings and figure out a compromise between them. You can get measurements off of the bushings, then figure out what you actually need once you've got them.

It's easier to solve this problem than you're probably thinking it is...

DFlintstone

Really it's over my head, and I might just as well keep my mouth shut, but....

There might be some chance that OBD-I 91 of yours, (and it's CPS), might prefer the flywheel that's now in it. (hate to see you bolt it up then find that the 99 flywheel has some difference). Might be just fine though.

fishtaconc

Before you put too much effort into this, there are couple things you should be aware of.

1. The '99 TJ should have the 0331 head, so before installing pull the valve cover and look where the oil filler would be for a green crust.

2. The TJ/WJ blocks used different mounting bosses fro the motor mounts, and wont work in a XJ.

5-90

The flywheels for OBD-I and OBD-II, as I recall, are essentially identical. And, the pilot bearings/bushings can be swapped at will, without having to do anything at all with the flywheel or flexplate.

IIRC, the CKP sensors for OBD-I and OBD-II are also identical - it's RENIX that's different.

freegdr

napa and rock auto both show them..

armmata

pilot bearing had to be milled down .500 before it would fit and i may run into the same mount issue but if so i plain to move the original ones thanks for the tip. i'm using the fly wheel out of my cherokee. Dose know any thing about the fuel system issuse with this swap

freegdr

cant you just swap your intake and exhaust manifold to new motor no issue that way ?

DFlintstone

Well, just to be a pain in the butt, (but actually I was just curious), I looked at crank sensors at rockauto. Different part numbers and different prices...doesn't mean they are different though! The airtex is over $30 cheaper for a 91 as opposed to a 99. Only about $10 difference with Std. Motor.

5-90

Could be as simple as the connectors being different - OBD-I and OBD-II are both Hall Effect sensors (while the RENIX sensor works on a different principle. That's why you can't cross over the 1990/1991 line with the CKPs.)

armmata

i got a full borlan exhaust withe new motor so i woulds like to keep and a cold air intake

DFlintstone

The Renix uses the Hall Effect as well, but yea, only two wires, no third reference feed. Hey check out what Lardeo found. VOLTAGE TEST for three wire OBD crank sensors> http://www.cherokeetech.com/VBull/sh...agnosis-Videos