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

[Steve Offiler]

It's amusing to consider what's really being discussed here is a "smart" truck equipped with "nerves" that will tell you where it has aches and pains as it ages.  

Sent from my iPhone

> On Jun 5, 2015, at 3:43 PM, "charlie hill" <charliehill at embarqmail.com> wrote:
> 
> 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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