[AT] Getting water out of a gearbox/now bearing life

Irma Brown bellville1 at gmail.com
Fri Jun 5 19:53:44 PDT 2015


obama admin could get this done for you, not likely though. Nothing for them
in it. I think you are just going to feel them. And replace whenever you
want or have to.... lol

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of charlie hill
Sent: Friday, June 5, 2015 2:50 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Getting water out of a gearbox/now bearing life

True!  Good idea.  Let's see if we can talk the big three into it?  grins.

Charlie

-----Original Message-----
From: Thomas Mehrkam
Sent: Friday, June 05, 2015 12:34 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Getting water out of a gearbox/now bearing life

Temperature sensor would be nice.
They could also include an Accelerometer that way the power train computer
could use the vibration of the bearing to predict when it should be changed.

They do this on turbines.  That way you could change it just before it
failed.  The vehicle could send you an email a couple of weeks before
failure is expected.



     On Friday, June 5, 2015 11:25 AM, charlie hill
<charliehill at embarqmail.com> wrote:


True enough I guess Steve.  Also the folks at GM have no interest in me
keeping my truck for 20 years and putting 500,000 miles on it.
Statistically, folks like me are way beyond an anomaly.  Still it would be
nice and at 10 times 2 bucks or even 100 times 2 bucks it would be an
interesting gadget to have. It would not have to read the actual bearing
race temperature.  All it would need to do is read the extremes at the
location of the zero speed sensor and report an out of range event that
would reset if it was short term.

Charlie

-----Original Message----- 
From: Stephen Offiler
Sent: Friday, June 05, 2015 9:18 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Getting water out of a gearbox/now bearing life

On Fri, Jun 5, 2015 at 7:30 AM, charlie hill <charliehill at embarqmail.com>
wrote:

> You know, it just occurred to me regarding what I wrote below,
> That hub assembly already has a zero speed sensor built into
> it.  Surely it would not have been too hard for GM's engineers to
> put a high temperature alarm in there two.  I guess it would have
> cost them a dollar or two.  With the price of a new truck comparable
> to my '06 now being in excess of $50,000 you would think they could
> afford to throw it in though.  Then again maybe the 2015's have that
> feature?
>
> Charlie
>
>
Nobody offers this feature as far as I know, and I'll acknowledge it is a
REALLY interesting idea, but the devil is in the details.

The system cost (temperature detection device, its mounting and sealing
within the bearing assembly, plus the wiring, plus the hardware components
and some software to interpret the signal inside a computer somewhere) is
potentially quite a bit greater than the $1-2 you suggest.  Ten times that
figure would not surprise me even a little bit.

But I think the real issue is statistics.  Somebody at GM, I can *assure*
you this is a fact, has done a Design Failure Modes and Effects Analysis
(DFMEA) on those bearings as well as every single other piece of the
truck.  They consider the likelihood of failure within a certain mileage or
timeframe (often 150,000 miles)  and they consider the negative effects of
a failure.  They rank every single component and system on the entire truck
and put the vast majority of time and effort into knocking down the most
likely failures with the most severe consequences.  I've worked for a major
automotive supplier in the past, and part of my job was creating and
maintaining DFMEA documents for the components we manufactured, so I know
exactly what I am talking about here.

In short, I am certain that those hubs/bearings have been the subject of a
DFMEA and they fell way back behind many other possible failure points and
got lost.  So no money, zero point zero dollars, allocated for your
temperature sensors.

SO
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