Rear bearings/hubs

[johnny]

That's what I did on two coaches - I replaced the rear bearings on this one though, because two of them showed problems. Still working fione several
years later.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell

 

[john r. lebetski]

No! You hand rotate drum and seat by torquing to 30. Without touching drum loosen nut til slack. Then finger tighten nut. If EITHER sets of holes
line up, pin it. If not LOOSEN the nut until the first hole lines up. Never tighten. The holes should be studied first while apart. They alternate
to give 2x the resolution of the nut castilations. Don't have your wheel assembly jetteson from improper adjustment!
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[RF_Burns]

This diagram is from Ken Henderson. It shows how and why to set the real seal slightly proud of the Hub and also has the retaining nut tightening
procedure.

New seals are deeper and have the inner portion of it's housing curled inward such that it could touch the inner bearing race cage.

http://www.gmcmhphotos.com/photos/misc/p63892-rear-axle-seal.html

Also, if you need a replacement dust cap for your hub, a Dorman 13997 is a good fit. Wally Anderson advises to be sure the cotter pin is bent close
around the retaining nut to prevent interference with this cap.

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[RF_Burns]

Rich,
The issue with the seals was discovered a few years ago. Dave Lenzi had found one source that was correct, but they changed several years ago.

There was a test where if you put a 1/4" spacer like a short drill bit under the seal lip with the seal on the table, the seal would not lie flat on
the table.

This test posted in 2010 shows the SKF21771 as a good seal (flush to hub)
http://www.gmcmhphotos.com/photos/rear-axle-seals-skf21771/p36367-stralian-test-must-slide-under-rubber-lip-rob.html

This is my test of the SKF21771 in 2017 and it fails the test. I had to set the seal proud of the hub to be safe.
http://www.gmcmhphotos.com/photos/skf-21771-rear-seal-fails-test/p63218-skf-21771-rear-seal-fails-the-0-25-clearence-test.html

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[RF_Burns]

I happened to be at Dave Lenzi's just before I knew I was redoing my bearings... so I bought his seal tool which sets the seal correctly.

Good question for the guys here... best way to set the seal without Dave Lenz's seal tool?
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[jerry burt]

> I used to update "seals" on my Nortons (felt and cork/rubber rings and whatever they had laying around in the factory, I think) with appropriate
> modern ones. These new seals were always too thick, so I would file them down to the correct dimension and this worked nicely. Is there a reason
> this should not be attempted on these wheel seals? If it is not a problem, what is the correct total thickness?

They are already too small.
--
Patti & Jerry Burt Fresno, CA.
73 Gmc 26' Canyon Lands
77 Palm Beach - Parts Coach
Members: FMCA - GMCMI - GMCWS
A truly happy person is one who can enjoy the scenery on a detour.

 

[LQQKatJon]

I should call Dave, but I think I remember what the issue is.

The problem I believe is when it is put flat, the inner rubber touches the bearing, and the seal will fail pre-maturely. By setting the seal about
1/16" proud, you give that a little clearance.yet still sealed against the spindle and hub.

I have one of dave's seal tools, and it works great. I have used it 3-4 times now. But in reality, that is an exact science, I am pretty certain
that 1/16" does not need to be 100% exact, just letting that seal sit outside of the hub "proud" that little bit will work just fine for most
everybody.

--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/

 

[jerry burt]

> Too small? I'm ok with what I've done but for folks reading down the road can you please elaborate?
>

> > > I used to update "seals" on my Nortons (felt and cork/rubber rings and whatever they had laying around in the factory, I think) with
> > > appropriate modern ones. These new seals were always too thick, so I would file them down to the correct dimension and this worked nicely. Is
> > > there a reason this should not be attempted on these wheel seals? If it is not a problem, what is the correct total thickness?
> >
> > They are already too small.

The seal case is already to short and allows the rubber to contact the bearing when installing the seal flush to the hub. I probably should have said
to short.
--
Patti & Jerry Burt Fresno, CA.
73 Gmc 26' Canyon Lands
77 Palm Beach - Parts Coach
Members: FMCA - GMCMI - GMCWS
A truly happy person is one who can enjoy the scenery on a detour.