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#1466935 Sat Sep 17 2022 06:27 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
Replacing pinion seal in what I believe to be a 55-62 GM diff. What seems to be a shim came out with the seal. Am I right in assuming I need to go find an identical shim before I put it back together?

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JW51 #1466936 Sat Sep 17 2022 06:28 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
The shim came out broken, by the way. Wondering if I hooked it with the seal puller

JW51 #1466950 Sat Sep 17 2022 07:55 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
Perhaps it’s just called a washer?

JW51 #1466992 Sun Sep 18 2022 01:02 AM
Joined: Dec 2008
Posts: 1,113
5
'Bolter
Maybe somebody shimmed the seal out so it would rub on a different spot on the yoke because it had a groove wore in it and was leaking.


Brian
1955.2 3100 Truck


The older I get the more dangerous I am!!!!!
JW51 #1466995 Sun Sep 18 2022 01:19 AM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
I’ll take a pic of the pinion end of the housing later. Perhaps someone can tell me if anything’s missing.

JW51 #1467029 Sun Sep 18 2022 01:12 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
A couple pics.

Is there supposed to be anything else in the form of a washer, etc, under the pinion flange? Spoke on the phone to a friend of a friend who specializes in rear ends…old timer. He said the mystery part was likely a piece of the crush sleeve. Is that possible?

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JW51 #1467042 Sun Sep 18 2022 01:55 PM
Joined: Feb 2000
Posts: 4,566
J
'Bolter
Crush sleeve is behind the bearing, it sets the bearing pre-load. Does the broken piece match the diameter of the yoke or the seal. The only reason I can think of having that shim or washer between the yoke and bearing is the previous mechanic thought they needed to space the yoke out from the bearing for clearance. If the yoke will fit tight up to the bearing without hitting the cage, then there is no need for it. If it does hit the cage
( moving parts ), then maybe the bearing is wrong. There should be no other reason to space the yoke out if everything is correctly installed.
If it matches the seal diameter, they might have been spacing the seal out so the sealing lip rides on a different area of the yoke. If this is the case, remove the spacer and install a speedy-sleeve seal repair to the yoke for a slightly larger diameter and fresh sealing surface.
What ever their reasoning was, it didn't stay where they put it, it has a lot wear marks on it!

Joe H #1467063 Sun Sep 18 2022 04:06 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
Originally Posted by Joe H
Crush sleeve is behind the bearing, it sets the bearing pre-load. Does the broken piece match the diameter of the yoke or the seal. The only reason I can think of having that shim or washer between the yoke and bearing is the previous mechanic thought they needed to space the yoke out from the bearing for clearance. If the yoke will fit tight up to the bearing without hitting the cage, then there is no need for it. If it does hit the cage
( moving parts ), then maybe the bearing is wrong. There should be no other reason to space the yoke out if everything is correctly installed.
If it matches the seal diameter, they might have been spacing the seal out so the sealing lip rides on a different area of the yoke. If this is the case, remove the spacer and install a speedy-sleeve seal repair to the yoke for a slightly larger diameter and fresh sealing surface.
What ever their reasoning was, it didn't stay where they put it, it has a lot wear marks on it!

I’ve actually got a different yoke that’s in better shape and a Speedi-sleeve. I know next to nothing about rear ends but couldn’t figure out his crush sleeve. He must have misunderstood me about something.

Question: I paint marked the nut and pinion threads to get things torqued to the same spot. Now that I’ve removed this mystery washer, that will be different. Is there a different way to approach the reassembly give you my circumstances?

JW51 #1467204 Mon Sep 19 2022 01:22 PM
Joined: Jan 2014
Posts: 2,345
J
JW51 Offline OP
'Bolter
Here’s my plan unless someone has a better one:

1) Verify yoke will contact the bearing.
2) Install new seal and speedi-sleeved yoke.
3) Tighten to paint mark I made before disassembly.
4) Measure thickness of mystery washer.
5) Verify threads per inch of pinion stud
6) Turn pinion nut past the paint mark to account for thickness of mystery washer.

I realize this is all far from ideal. The rear end probably needs a proper rebuild or outright replaced. Just trying to make the truck somewhat mobile again in the meantime.

JW51 #1467214 Mon Sep 19 2022 02:10 PM
Joined: Feb 2000
Posts: 4,566
J
'Bolter
The washer will not effect the bearing preload, it was on the wrong side of the bearing, all you will need to do is tighten the nut back to where it gets tight. Crush sleeves are very hard to crush, it takes really long pipes and wrenches to get them to the right spot, I've had 5 foot long pipes on breaker bars and pipe wrenches getting them tight. Just torque the nut tight enough not to come off and not so much you crush the sleeve any more. The bearing should have some preload, yet still turn smooth with no bearing binding. The seal will cause drag, so while you are tightening the nut, keep stopping and checking for play, its pretty easy to feel when you are getting close. If using a used lock nut, peen it over once tight with a small punch just enough to lock it down. New nuts will be tight all the way in. You would have to really over tighten the nut to do any damage, so don't worry about threads per-inch and all that, you will know when it hits the crush sleeve, crush sleeves take 200 foot lbs of torque or more to crush.
When set right, it takes a little effort to turn the pinion, but once turning it take less effort to keep it turning if that makes sense. You can feel the bearings rolling, typical numbers are 20 -30 Inch pounds to keep it rotating, more to get it started.

https://www.freeasestudyguides.com/pinion-bearing-preload.html

Last edited by Joe H; Mon Sep 19 2022 02:28 PM.
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