| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331137 is a reply to message #331109] |
Fri, 20 April 2018 10:49   |
powwerjon
Messages: 849
Registered: March 2013
Karma:
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Senior Member |
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This issue was originally brought up by Dave Lenzi at the Fall 2010 DuQuoin
Convention where he had discovered several sets of rear bearings had an
issue with metal in the grease. Dave said there were 2 manufactures that
were OK. They are the Chicago Rawhide 3857731 and the SKF 21771. The SKF
is sold by NAPA.
https://www.napaonline.com/en/p/NOS21771?interchange=1
http://www.gmcmhphotos.com/photos/general-pictures/p45146-rear-bogy-seal.html
J.R. Wright
GMC Great Laker
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 30' Stretch
75 Avion (Under going Frame up Restoration)
On Fri, Apr 20, 2018 at 12:19 AM, Richard wrote:
> Ken,
> I opened a can of worms for myself when I took a look at someone's coach
> after the GMCMI. There was too much play in the passenger rearmost wheel,
> and that lead to discovering a loose bearing cup, broken brake shoes, an
> out of round drum on it's last legs, etc.
>
> Trying to put it back together, I'm trying to locate seals that pass the
> 1/4" test and after hitting several auto parts stores and opening a dozen or
> more boxes from several different brands, found that none of them passed,
> or were even that close. From the drawing in the manual it appears as you
> say, that there's no way the metal could contact the bearing. So where
> did the 1/4" test come from? Does it matter?
>
> Richard V.
>
> Ken Henderson wrote on Tue, 30 May 2017 09:37
>> John,
>>
>> IIRC, you're thinking of the front wheel bearing seal. From the drawing
> I
>> posted, it appears virtually impossible for the metal to touch the
>> bearing. But the rubber is separated from it only by about the distance
>> the seal should be left proud of the hub.
>>
>> https://drive.google.com/file/d/0B3XquSIYjDleenNDM1BHQlNHa1E/
>> view?usp=sharing
>>
>> Ken H.
>>
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> '77 Birchaven TZE...777
>
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