| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331145 is a reply to message #331138] |
Fri, 20 April 2018 13:39   |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Read here
http://gmcmotorhome.info/front.html#ZERK
On Fri, Apr 20, 2018 at 8:54 AM Rob Mueller wrote:
> JR,
>
> At last falls GMCMI Convention in Elkhart, Dave showed me that the Chicago
> Rawhide / SKF 21771 had problems as well which is why he
> found a source that was OK and produced the installation tool.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of John
> Wright
> Sent: Friday, April 20, 2018 10:50 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test
>
> 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)
>
>
>
> _______________________________________________
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>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331151 is a reply to message #331130] |
Fri, 20 April 2018 14:48 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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USAussie wrote on Fri, 20 April 2018 10:10Bruce,
It should be noted that Dave found a supplier that provided seals that met HIS requirements THEN manufactured the tool to install
them.
The tool may or may not work with Chicago Rawhide / SKF or seals made by other manufacturers.
Regards,
Rob M.
Rob,
I haven't found an SKF seal that passes the 1/4" test, and I'm beginning to feel that it's a fool's errand trying to find one.
Would I be off-base assuming that one could measure the clearance of the rubber seal and simply add the difference that it's short to the spec for how proud the seal sits? That is, if instead of .250" clearance under the rubber there's only .220" could I add the .030" difference to the spec'd .025" to .045" proud seal set? ie, set the seal .055" to .075" proud?
Is this simply a measure the seal and modify the depth of set situation? That would make my life simpler and piss off far fewer auto parts people!
Thanks.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331154 is a reply to message #318199] |
Fri, 20 April 2018 15:20 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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Senior Member |
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richshoop wrote on Mon, 29 May 2017 23:14I will call SKF tomorrow and get a dim drawing. Pass it along to the group. It is possible that SKF changed their internal spacing, as all the information in their seal catalog describes only applications where the seal is treated as a stand alone assembly, and not as a part (of a larger assembly). I'll turn a few seal installation tools, this weekend.
Rich,
I called SKF yesterday and the tech rep, while helpful, was unable to provide information on their seal's designed clearance, or a measured drawing, so there's no way of knowing if recent SKF seals' failure to meet our clearance criteria is by design.
If you could get more information from SKF I'd love to see a dimensioned drawing.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331158 is a reply to message #331154] |
Fri, 20 April 2018 19:06 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I have noticed quite a bit of difference in the shoulders on different
spindles. Some protrude towards the threaded end more than others do. That
would place the shoulder close to the seal in some situations. And would be
the reason for interference in some situations.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Fri, Apr 20, 2018, 1:20 PM Richard wrote:
> richshoop wrote on Mon, 29 May 2017 23:14
>> I will call SKF tomorrow and get a dim drawing. Pass it along to the
> group. It is possible that SKF changed their internal spacing, as all the
>> information in their seal catalog describes only applications where the
> seal is treated as a stand alone assembly, and not as a part (of a larger
>> assembly). I'll turn a few seal installation tools, this weekend.
>
>
> Rich,
> I called SKF yesterday and the tech rep, while helpful, was unable to
> provide information on their seal's designed clearance, or a measured
> drawing,
> so there's no way of knowing if recent SKF seals' failure to meet our
> clearance criteria is by design.
>
> If you could get more information from SKF I'd love to see a dimensioned
> drawing.
>
> Richard
>
> --
> '77 Birchaven TZE...777
>
> _______________________________________________
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> Unsubscribe or Change List Options:
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| Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test [message #331188 is a reply to message #331151] |
Sat, 21 April 2018 12:27 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Richard,
Review this drawing:
http://www.gmcmhphotos.com/photos/skf-21771-rear-seal-fails-test/p63893-rear-axle-seal.html
Note the position of the seal on the spindle. The problem arises when the seal comes in contact with the inner race of the bearing.
I guess you could set the seal to 0.055 to 0.070 proud and then coat it with grease and put the hub on until the inner bearing seats
on the spindle, then pull it straight off.
Look at the spindle and see where the grease is on the spindle.
I don't know if this will work or not but it's the only way I could come up with to see where the seal rode.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Richard
Sent: Friday, April 20, 2018 2:49 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] NAPA SKF-21771 rear bearing seal fails the 0.25" test
Rob,
I haven't found an SKF seal that passes the 1/4" test, and I'm beginning to feel that it's a fool's errand trying to find one.
Would I be off-base assuming that one could measure the clearance of the rubber seal and simply add the difference that it's short
to the spec for how proud the seal sits? That is, if instead of .250" clearance under the rubber there's only .220" could I add the
.030" difference to the spec'd .025" to .045" proud seal set? ie, set the seal .055" to .075" proud?
Is this simply a measure the seal and modify the depth of set situation? That would make my life simpler and piss off far fewer
auto parts people!
Thanks.
Richard
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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