AMC 20 One Piece Axle Install - Questions - JeepForum.com
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Unread 06-10-2013, 07:53 PM   #1
jumper182
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AMC 20 One Piece Axle Install - Questions

I'm getting ready to do a one piece axle install in my AMC20, and I have a couple of questions.

My old axle had shims between the backing plate and axle flange on the LEFT side only.
Do I need to reuse them?

When I am setting the bearing spacer location, so that I have the proper overhang of the bearing to the face of the axle flange....do I include the shims on the left side as well?

Thank you for your time,
Mike

axle-shims-left-side.jpg   one-piece-axle-bearing-spacer-question.jpg  
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Unread 06-11-2013, 07:43 AM   #2
WindKnot
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You won't need the shims from the old axle with the one piece axles. As far as getting the proper spacing for the new bearings, good news is that just about every time everything falls into specs. If the bearing is too proud, you would need to find a machine shop to remove some material from the spacer rings. Again, almost never happens.
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Unread 06-11-2013, 10:18 AM   #3
BigWheelBob
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No shims required, and you can use a belt sander to set your race stickout.
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Unread 06-11-2013, 10:28 AM   #4
sherlocktk
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When I did mine the bearing was out too far, and I just kept working the inner seal, making sure it was fully seated. I got about .015 more out of it after taping on it forever. so make SURE it is seated before you do any grinding.
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Unread 06-11-2013, 12:09 PM   #5
S76
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I don't want to throw a monkey wrench in your plans but you may want to consider this.

I am preparing to put in one piece axles also. I have the axles but the 20 is still out getting rebuilt so I am on hold for the moment. In the meantime a friend was doing a similar job on a vintage GTO and ran into the following problem. He was using Yukon axles, and I have Crown axles and they both have the same defect.

If you look at the factory axle it has a nice smooth area were the inner factory seal rides on it. This area is cut a tiny bit smaller than the part of the axle where the bearing and the press fit retainer ring go. The new axles are not made that way. They are the same diameter all the way. He didn't notice at first, but once the bearing and retainer were pressed on, the axle was galled in the area the inner seal rides because the bearing and retainer are pressed over and past this part of the axle galling the metal in the process.

I would suggest marking the area where the seal rides like the factory axle and having the axles turned down a little and polished in that spot. The bearing is .003 tight fit and the retainer is .006 tight. So you need to remove .006 in the area where the seal rides to prevent the galling during assembly. .006 tight is very very tight!

Just guessing, but I suspect this galling is the reason so many people have problems with leaking axle seals. No seal will work on a rough surface.

Just my $.02.
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Unread 06-11-2013, 12:36 PM   #6
WindKnot
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I've had Mosers for years, built the same way (same diameter but smooth) and haven't had the problem. Some suggest not installing the inner seals and running the bearings wet.
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Unread 06-11-2013, 01:35 PM   #7
LumpyGrits
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No shims needed.
Stay with the inner seal.
BEFORE you install that axle, coat the OD of the shaft with grease so you don't scuff/cut that inner seal.
Don't forget to seal the backside of the brakes backing plate were it meets the axles flange.
Pact the bearing w/grease and add a handfull extra inside the axle housing where the bearing 'lives'.
LG
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Unread 06-11-2013, 04:27 PM   #8
WindKnot
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^^^I agree^^^ The point I was making though is that I don't think there's an issue. Also, the OP should search the archives as there are approximately eleven billionty threads on just this subject alone.
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Unread 06-13-2013, 08:15 PM   #9
jumper182
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Thank you for the response and advice!

This is what makes this forum so great, the sharing of information so the next ones learn from those that have done before. I do appreciate it!

Mike
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