| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331109 is a reply to message #318218] |
Thu, 19 April 2018 23:19   |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
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Senior Member |
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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 09:37John,
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;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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