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

[charlie hill]

Well Stephen,  I've driven that truck in excess of 250,000 miles
and those two hubs and a transfer case are all of the problems
I've had.  I could tell I had a transfer case problem when it first
wouldn't go into 4wd low and then when it started jumping out
of 2H.  Based on that data I think I know where I need the sensor!

Charlie

-----Original Message----- 
From: Stephen Offiler
Sent: Friday, June 05, 2015 1:30 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Getting water out of a gearbox/now bearing life

If you really sit and think about it, Charlie, you might very well come up
with a dozen OTHER places on the truck that you'd REALLY like having either
temperature data, or perhaps vibration data, or perhaps stress/strain data.
Whatever might be best at signaling impending failure on specific
components of the truck.   Make that list and rank it, and decide how much
funds you'd commit to each.  Your wheel bearing temperature sensor might
fall off the bottom of that list!

SO


On Fri, Jun 5, 2015 at 12:04 PM, 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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