[Fot] variation in Timken carrier bearing width?

[Aaron Johnson]

All major bearing brands are and have been counterfeited.   Do not think because it's in a box from that company it's ok.  Don't think because it's marked correctly that it's ok.  I have seen and investigated aero engine failures with bearings that are marked with our cage code and lots that trace to actual manufacturing lots.  However we track serial numbers and have real ones service.  Only buy bearings from authorised sellers or distributors.  Anything purchased through a third part is sceptical in my book 

Sent from my iPhone

> On 30-Sep-2016, at 9:02 PM, Ashley Page <apage at prosystembrakes.com> wrote:
> 
> Ive seen it in my work too, but did not realize how big a problem its become. Not only Timken but other top brands as well. Thanks Aaron.
> https://thecounterfeitreport.com/product/271/Timken-Bearings.html
>  
>  
> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Aaron Johnson
> Sent: Thursday, September 29, 2016 10:22 PM
> To: Jason Sukey <jsukey at gmail.com>
> Cc: FOT list <fot at autox.team.net>
> Subject: Re: [Fot] variation in Timken carrier bearing width?
>  
> How did you order the bearings?    There is a huge counterfit bearing manufacturing market.   I have lost count how many times over the last 6 years I've had to investigate them.  The last set of ball bearings I bought were skf but we're obviously not legitimate.  I took it with me to skf on a visit and confirmed it was not made in any of their factories.  
>  
> If you've got concerns of counterfit bearings send me some pictures and I can help. 
>  
> Aaron
> 
> Sent from my iPhone
> 
> On 29-Sep-2016, at 10:29 PM, Jason Sukey <jsukey at gmail.com> wrote:
> 
> John,
>         Replacing the old bearings because they were worn out.  New Timkens seem to be the best available option.
>  
> Jason
>  
> On Thu, Sep 29, 2016 at 12:52 PM, John Styduhar <johnstydo at gmail.com> wrote:
> 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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