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

[David Rotigel]

If all the ideas were incorporated into the truck the price would be upwards of $80,000.00!
	Dave
PS, If I got 250,000 miles out of a bearing (or even my hip) I'd be bragging about it!

On Jun 5, 2015, at 8:36 PM, Steve Offiler <soffiler at gmail.com> wrote:

> 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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