4.0 pilot bearing

Charles Smith

Charles Smith

smitty1371
Joined
Sep 28, 2017
Location
ellerbe nc
I'm doing a clutch on a 95 4.0 wrangler. Pulled out the old pilot bearing it was a solid brass one it deformed some on the way out. When I go to put the new nice looking needle bearing version in it's too small it wiggles in the crank bore it fits the input of the trans perfectly. I go to the parts store they bring me the same one the new bearing measures 1" outer diameter. My research says this is right I measured the diameter of the old bushing it measures about 1.060 or so its deformed so it's hard to get a solid measurement. I tried to get my calipers in there to get the crank bore measured but it wont fit. Im pretty sure it's the original engine but i have no assurances of that. does anyone have a part number or some advice to help thanks.
 
So I looked at Summit (they have a lot of useful info while applying search filters), and it appears that there is a 1.054 inch OD bearing, and that it was used on the 4.0L/4.2L engines from 1987 to 1991. I know practically nothing about Jeeps, but I like solving mysteries and learning stuff.

If you look on the "Applications" tab on any of those 3 part numbers, it will give more info.

https://www.summitracing.com/search/part-type/pilot-bearings-and-bushings/make/jeep/engine-size/4-0l-242?N=outer-diameter-in:1-054-in

So it's possible that you have an earlier engine, or maybe earlier crank during a rebuild or whatever. I have no idea if Jeep cranks interchange, I'm just stating the common reasons that stuff like this happens.

Also, the fact that a bushing came out of it, instead of a bearing, means that it is likely an earlier engine. There aren't any bushing listings for 1995 Wranglers at all, only bearings.
 
Last edited:
Fabrik8 said:
So I looked at Summit (they have a lot of useful info while applying search filters), and it appears that there is a 1.054 inch OD bearing, and that is was used on the 4L engines from 1987 to 1991.

If you look on the "Applications" tab on any of those 3 part numbers, it will give more info.

https://www.summitracing.com/search/part-type/pilot-bearings-and-bushings/make/jeep/engine-size/4-0l-242?N=outer-diameter-in:1-054-in

So it's possible that you have an earlier engine, or maybe earlier crank during a rebuild or whatever. I have no idea if cranks will interchange, I'm just stating the common reasons that stuff like this happens.
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yeah I found a similar thing the problem I have is the trans input for 91 and older has a smaller diameter the 92+ is 3/4" which I measured on this trans so it's like I have a 91 crank pocket and a 92+ trans input but I will check on summit to see if they have one like that
 
Charles Smith said:
yeah I found a similar thing the problem I have is the trans input for 91 and older has a smaller diameter the 92+ is 3/4" which I measured on this trans so it's like I have a 91 crank pocket and a 92+ trans input but I will check on summit to see if they have one like that
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That's probably why there was a bushing in it. Probably an adapter bushing or someone turned the ID to match the trans (obviously).

On the plus side, if you can verify the crank bore diameter, you could probably make/buy/etc an adapter sleeve to make up the 0.054 diameter difference. It will be thin, but not too bad.
 
Bushing will be fine, my 91 yj had a bushing, as well as a 94 xj. I think I drilled the old bushing in half to remove it since I couldn't get the puller to grab it. Ymmv
 
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