AMC 20 rear axle seal leaks - JeepForum.com
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post #1 of 17 Old 09-30-2018, 04:14 PM Thread Starter
Alexr54
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AMC 20 rear axle seal leaks

I just changed all bearings and seals for a one piece amc 20 because both sides were leaking.
Got the kits for the one piece. Crown Automotive 7086BK.

Was all fine for about 100 miles then the driver side blew again. The bearing completely blew and burnt.

What should I look for? Maybe something with the housing or axle is damaged?
This is never ending and I’m close to just saying screw it and let it sit until I replace the entire rear axle. Which may be a while.

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post #2 of 17 Old 09-30-2018, 05:18 PM Thread Starter
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So after doing some more research i read that the thrust block should be removed when using the one piece axle.
When we changed the bearings and reinstalled the axles it was quite tight to spin. We had to bang them in some to get them to spin freely. Is it possible this could be the culprit of the driver side seal blowout?
I'm pretty sure the thrust bearing was never removed. And the one piece axle were using is from a PO so i do not know what make/model it is.
We also did need to grind down the spacers a bit to get the bearing to sit correctly.

I'm wondering, is it really necessary to remove the thrust block with a one piece amc 20? Can this cause the blowout?
I'm just trying to find what could be causing it, what i could be doing wrong... (i have installed the bearings using a 20 ton press and followed multiple write-ups and YouTube videos). Before i attempt this again.
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post #3 of 17 Old 09-30-2018, 06:16 PM
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If your thrust block is still in place, that would be the first thing I would blame for difficulty in establishing the proper pre-load and blowing a seal. I installed the Moser 1-pc axles on my AMC20, and removed the thrust block as indicated in the instructions. Not hard to do, but requires at least one axle be removed, as well as cracking open the rear differential. Grinding down those spacers was the hardest part.

Hoov

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post #4 of 17 Old 09-30-2018, 06:19 PM Thread Starter
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Quote:
Originally Posted by Hoover7 View Post
If your thrust block is still in place, that would be the first thing I would blame for difficulty in establishing the proper pre-load and blowing a seal. I installed the Moser 1-pc axles on my AMC20, and removed the thrust block as indicated in the instructions. Not hard to do, but requires at least one axle be removed, as well as cracking open the rear differential. Grinding down those spacers was the hardest part.



Hoov

The one piece I have is from a P.O. so I’m not sure which one it is. The differential is too. I had no idea about the thrust block until this happened.
If I had the original one piece with the instructions I would definitely have done as instructed.
I wish I knew which make this axel is. No markings or anything on it.

i really need to learn how to measure and achieve proper pre-load.
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post #5 of 17 Old 09-30-2018, 06:22 PM Thread Starter
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Here is a picture of the driver side I just took off.

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post #6 of 17 Old 09-30-2018, 07:09 PM Thread Starter
Alexr54
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AMC 20 rear axle seal leaks

I was referred to get the moser kit for bearings and seals. But I cant find it.
Does anyone have the part number for the moser 1 piece amc 20 bearings and seals?


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post #7 of 17 Old 09-30-2018, 07:40 PM
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Alexr54, I have Yukon gears and axle shafts in my AMC model 20 rear axle.
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post #8 of 17 Old 09-30-2018, 07:41 PM Thread Starter
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Quote:
Originally Posted by Hyproglo View Post
Alexr54, I have Yukon gears and axle shafts in my AMC model 20 rear axle.


Does your one piece look like mine?
Do you know the part #?
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post #9 of 17 Old 09-30-2018, 07:54 PM
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Quote:
Originally Posted by Alexr54 View Post
Does your one piece look like mine?
No.
Quote:
Originally Posted by Alexr54 View Post
Do you know the part #?
Yukon Gear and Axle YCJS [21393]
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post #10 of 17 Old 09-30-2018, 09:56 PM
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Just looked this up on Moser site
CJTBK-1/2 - Jeep Model 20 Replacement Tapered Bearing Kit (1-Side Only)
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post #11 of 17 Old 09-30-2018, 09:59 PM Thread Starter
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Thank you!
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post #12 of 17 Old 10-01-2018, 09:51 AM Thread Starter
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Quote:
Originally Posted by popascj7 View Post
Just looked this up on Moser site
CJTBK-1/2 - Jeep Model 20 Replacement Tapered Bearing Kit (1-Side Only)


Looks like the only place that sells them that I can find is jegs. And it takes a week just to ship out
I cant order from moser since Im not a reseller.
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post #13 of 17 Old 10-01-2018, 10:24 AM
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Quote:
Originally Posted by Alexr54 View Post
Looks like the only place that sells them that I can find is jegs. And it takes a week just to ship out
I cant order from moser since Im not a reseller.
Do you just need 1 side, or both? CJTBK is the p/n for the full set (both sides) and you can order directly from Moser http://www.moserengineering.com/CJTB...side-only.item

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post #14 of 17 Old 10-01-2018, 10:32 AM Thread Starter
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I removed the passenger side this morning and it looks perfectly fine.

Just one side is needed.
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post #15 of 17 Old 10-02-2018, 09:31 AM Thread Starter
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Thanks again.
I decided to order the set. Just to be on the safe side.
It does not look like the passenger side is damaged at all and seems to be sitting correctly.

I will change the driver side and remove the thrust plate. And have an extra set of bearings on standby. All this waiting is killing me.
I have the sniper EFI and pump coming in tomorrow and I will be staring at the box until the bearing and seal are replaced.
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