Pilot bearing help

[ftpiercecracker1]

93 ZJ 4.0 mated to 90 ax-15. Have to have a custom pilot bearing/bushing made.

 

I can have a custom machined bronze olite bushing made for free thanks to my brother, but I am having difficulty nailing down the right dimensions.

 

93 ZJ Bearing: According to print out from parts store.

 

http://cdn.4ws.com/media/catalog/product/cache/26/image/950x/040ec09b1e35df139433887a97daa66f/1/6/16910.10.jpg

 

OD 1"

ID .75

Depth .5618

 

The problem is, there seems to be two different ZJ pilot bearing styles. The above dimensions are for just the bearing as pictured.

 

Then I have seen these. . http://i.ebayimg.com/images/g/NrYAAOxyyFhTeQG~/s-l300.jpg

. . . These two are also labeled as ZJ pilot bearings.

 

Is the bearing in the first picture pressed into the part in the lower picture and then the whole assembly pressed into the crankshaft? Or is the lower item something different altogether?

 

 

I also got a printout for the transmission pilot bearing, but I don't know if the dimensions are for the sleeve the bearing goes into or the bearing itself.

 

 

90 XJ bearing:

 

http://images.oreillyauto.com/parts/img/medium/bca/nnt_fc66426_p04_ang.jpg

 

OD 1.0546"

ID .5934"

Depth .7190"

 

 

Also, bushing or bearing? Would it be worth the time/effort to make a custom bushing that would accept a proper bearing or would a plain oilite bushing be sufficient?

 

An oilite bushing would take all of 2min to make with the right dimensions, so if there's not much difference between a bushing and a bearing I'll probably just go with a bushing.

 

 

Also, what can I do in the event the snout of my input shaft is FUBAR?

 

 

Thanks

FPC.

[Jackrabbit41]

I had a bushing made with the renix pilot bearing OD and the ax15 bearing ID and it's been perfect

[schardein]

I've never learned or heard of what determines the best choice for a pilot bearing, the choices being an actual roller bearing or a bronze bushing.

 

As for a messed up pilot tip on the transmission input shaft, if it is light rust or scratches, I would not be afraid to clean it up with emery cloth and run it.  I would guess the worst that could happen is it might be a little noisy, although I doubt even that, especially if using a bushing and not a roller bearing. 

 

If the tip was significantly scarred, I would look at replacing the input shaft and possibly the bearing, and then double checking it for concentricity with the crankshaft centerline.

 

On the other hand, it sounds like you have access to a machine shop.  You could clean up the pilot tip on a lathe, and if it came out undersized, you could custom match the input bushing to it.  Might be cheaper than a new shaft.  Just be careful to keep everything concentric.

[ftpiercecracker1]

I had a bushing made with the renix pilot bearing OD and the ax15 bearing ID and it's been perfect

So does that mean you are running a Grand Cherokee 4.0?

 

That is what I'm thinking about doing, but because of the mismatched engine and transmission I don't know what my dimensions need to be.

[ftpiercecracker1]

I've never learned or heard of what determines the best choice for a pilot bearing, the choices being an actual roller bearing or a bronze bushing.

 

As for a messed up pilot tip on the transmission input shaft, if it is light rust or scratches, I would not be afraid to clean it up with emery cloth and run it. I would guess the worst that could happen is it might be a little noisy, although I doubt even that, especially if using a bushing and not a roller bearing.

 

If the tip was significantly scarred, I would look at replacing the input shaft and possibly the bearing, and then double checking it for concentricity with the crankshaft centerline.

 

On the other hand, it sounds like you have access to a machine shop. You could clean up the pilot tip on a lathe, and if it came out undersized, you could custom match the input bushing to it. Might be cheaper than a new shaft. Just be careful to keep everything concentric.

 

I'm hoping it will not be too bad, but I have put several thousand miles on it with a totally shot pilot bearing. I've gotten pretty good at keeping it from shuttering on take off, but there's only so much you can do.

 

If the input shaft is really beat up I will just replace the transmission, it has been on borrowed time for quite a while now.

[Jackrabbit41]

No I have a 87 4.0 renix. Its stock