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Old 10-01-2016, 02:14 PM   #1
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Leaking axle seal

First, I searched and found an old thread that didn't quite help my particular problem...

I'm needing to replace an axle seal... Google & YouTube make it look pretty straightforward.
I just want to make sure I'm not missing anything.

1) bust the 8 nuts loose, (catch the oil)
2) slide out axle hub & shaft (mark orientation)
3) remove old seal
4) install new seal
5) slide axle hub & shaft back in*
6) reinstall the 8 nuts
7) add new axle oil to fill hole on differential
8 ) wash hands, stand back and say "I did it"
9) take the oil to reclamation center.


There's no pulling wheels & tires?
No jacking up axle & tires?
No opening differential?
*No spline keyway?

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Old 10-01-2016, 02:17 PM   #2
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post pics when you do it!

i got one too, the more info the better!
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Old 10-01-2016, 02:27 PM   #3
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Quote:
Originally Posted by turf View Post
post pics when you do it!

i got one too, the more info the better!

You do it first and I'll watch!
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Old 10-01-2016, 02:56 PM   #4
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it seams to me that there should be an inner seal at the hog head an outer seal at/near the brake drum and something in there to keep the axle from sliding out on its own?
I have watched many videos on changing my rear gears in an eaton rear end and they have retaking rings,bearings and all kinds of stuff to deal with to slide the axles back enough to change the ring and pinion gears and is recommended while its apart to change all of the stuff?
Good luck
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Old 10-01-2016, 02:59 PM   #5
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Quote:
Originally Posted by Jolly Roger View Post
it seams to me that there should be an inner seal at the hog head an outer seal at/near the brake drum and something in there to keep the axle from sliding out on its own?
I have watched many videos on changing my rear gears in an eaton rear end and they have retaking rings,bearings and all kinds of stuff to deal with to slide the axles back enough to change the ring and pinion gears and is recommended while its apart to change all of the stuff?
Good luck
I'm visualizing some kind of retainer ring on the spline end behind diff cover... The 8 nuts & studs won't keep the axles in otherwise???
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Old 10-01-2016, 03:08 PM   #6
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I don't know never opened one up?
The videos for mine show a retaining ring inside the differential?
This is a question for crazy cal.
If you have looked at the actual school bus forum for the school districts and school administrators then cal has been there done that with school buses as far as school buses in there intended world?
If he don't see this thread or reply then maybe PM him?
Usually my referencing his name gets a response?
Good luck
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Old 10-01-2016, 03:10 PM   #7
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Rated Cap: 6 souls and a driver
Quote:
Originally Posted by Jolly Roger View Post
I don't know never opened one up?
The videos for mine show a retaining ring inside the differential?
This is a question for crazy cal.
If you have looked at the actual school bus forum for the school districts and school administrators then cal has been there done that with school buses as far as school buses in there intended world?
If he don't see this thread or reply then maybe PM him?
Usually my referencing his name gets a response?
Good luck
I got this
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Old 10-01-2016, 03:17 PM   #8
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Hell yeah
Let us know the decision/outcome.
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Old 10-01-2016, 05:50 PM   #9
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If it was mine. I'd be asking "why did it leak?" Several probable causes are as follows:
Too much oil in rear axle.
Axle vent plugged up causing pressure build up.
The nylon in the nylon locker axle nuts dried up and loosening. (check tightness torque before removing nuts)
Some fool over tightened the studs in the hub and pulled the threads out thereby making it impossible to tighten the nuts to specification. (same check as above will give you this answer)
Damaged gasket or gasket material perhaps from the axle having been removed to keep the drive line from turning while towing the bus from the front. This is quite common.

A full floating axle like that would not have a "C" clip in the differential as there would be no way to install or remove it.

Hope this helps, Jack
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Old 10-01-2016, 05:55 PM   #10
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Join Date: May 2015
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Year: 1989
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Chassis: 35' Retired Air Force Ambulance
Engine: DT466, MT643
Rated Cap: 6 souls and a driver
I'm guessing on a 1989 bus, that has sat for years, seals are going to get brittle and crack

Whatever caused it, I've got to learn how to replace it and diagnose future problems while I'm under there.
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