[Fot] FW: variation in Timken carrier bearing width?

[Jason Sukey]

Jim, do you know the set that includes the 15123/15245 bearing/race used in
the earlier gt6/spit differential?
The sets for the later differentials are easy to find, but I've had no luck
with finding the earlier ones in a set.
Jason

On Sep 30, 2016 8:21 PM, "Jim Cox" <jcox at bransonauction.com> wrote:




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.012 would not surprise me for stack height variation. My guess is that he
ordered by bearing NUMBER-not by bearing assembly. There is a thing called
“half stand tolerance” that would cut his error in at least half. There
isn’t really an issue here-he is just seeing the standard deviation in
assemblies, and that is why they have to use shims to get it perfect. The
original assembly probably has that stand tolerance and over time that
information has been lost.  Each assembly throws off a unique set of
dimensions. MORE SHIMS!!!!!



*Jim Cox*

*800.335.3063 <800.335.3063> /417.849.2095 <417.849.2095>*

*www.bransonauction.com <http://www.bransonauction.com>*


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*From:* Fot [mailto:fot-bounces at autox.team.net <fot-bounces at autox.team.net>]
*On Behalf Of *John Styduhar
*Sent:* Thursday, September 29, 2016 11:52 AM
*To:* Jason Sukey
*Cc:* FOT list

*Subject:* Re: [Fot] variation in Timken carrier bearing width?



Some of the USA-stamped Timkens even look cheap when you compare them to
the England-made.  I wouldn't be surprised if they were made overseas. If
there is nothing wrong with your old bearings, why replace them?



On Thu, Sep 29, 2016 at 8:59 AM, Jason Sukey <jsukey at gmail.com> wrote:

Has anyone else noticed rather large variation in carrier bearing width's
when rebuilding a spitfire differential?  The one I'm building right now,
I've replaced what I suspect are the original bearings (Timken England)
with brand new Timken USA bearings.  In order to reach the required .004"
preload, it will require .012" LESS total shim than what was in there
originally.  That seems like a big difference with the only variable being
new bearings.  I'm using the same housing, same carrier, the bearings
visually look to be fully pressed home.  Anyone else experience this?



Thanks,



Jason Sukey


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