Mark,
I've seen all kinds of recommendations on where to place the
temperature probe for your trans temp guage, including strapping it onto
the dipstick tube. Mine is in the pan because that was easier than
installing a 'Tee' fitting in a cooler line, and one theory says that
the pan is the best place because that's the temperature that the
transmission sees. It won't be "cool because cool fluids sink"; the oil
is circulating fast enough that it's all pretty much the same temp, or
at least close enough. In fact, you would probably have seen the
overheating condition in your transmission had the probe been in the pan
instead of the return line. If I was to place it in a cooler line, I
think I'd put it in the line TO the cooler.
You're right about heating the trans quickly when maneuvering at a
campsite, and I'll bet most folks would never guess that this is a
dangerous situation. One usually thinks of pulling a hill as being
dangerous for trans temps.
The most important thing is to have a trans temp guage and monitor it.
The exact location of the pickup probably isn't that important, but I
wouldn't have it in the cooler return in any event.
<<Jim>>
Weimers wrote:
>
> The gauge I bought told me to tee into the return transmission cooler line.
> I did that about 2 inches from my transmission. I'm not sure that is the
> best location, but that's what they recommended, so I went with it. It's
> surprising how fast the fluid temperature zooms up towards the danger zone
> when you are maneuvering the trailer on a hilly campsite!
>
> My transmission was still able to overheat even though the gauge didn't
> necessarily show it. I had a problem with low pressure in my transmission
> due to a maladjusted pressure control valve. This caused a very slow flow
> through the torque converter and the transmission cooler. The fluid
> apparently overheated in the torque converter. This happened on long uphill
> runs. The gauge didn't always tell me things were too hot. Suddenly, the
> transmission fluid would start to pour out the transmission onto the ground
> (out the vent). I think it's because my transmission fluid was boiling in
> the torque converter. The slow fluid flow allowed the fluid to cool
> sufficiently in my nice large transmission cooler so that the gauge didn't
> show the extreme temperature. If I had put the gauge on the outgoing cooling
> line on the transmission maybe I would have seen the problem better. I'm
> guessing, however.
>
> Incidentally, I tried hooking the gauge up to the bottom of the sump of the
> transmission and it only showed cool temperatures. Cool fluids sink!
>
> My transmission has been fine since the pressure was turned up. The front of
> my Airstream still has spots on it from all the transmission fluid blown all
> over it! (On the bright side, my steel parts aren't rusty!)
>
> Maybe somebody has some comments on this??
>
> MARC WEIMER
> Punxsutawney, PA - Home of the Groundhog
> #15767
> 1963 Globe Trotter
> 1971 Globe Trotter
> http://users.penn.com/~mweimer/weimer.html
>
> ----- Original Message -----
> From: "Jim Greene" <[EMAIL PROTECTED]>
> To: "Multiple recipients of VACList" <[EMAIL PROTECTED]>
> Sent: Sunday, April 22, 2001 7:44 PM
> Subject: [VAC] Transmission Oil Temp and Use of OD
>
> > Jim, I'm slow reading my mail due to travel. How would you install a
> > transmission oil temp gauge? I'd like to install one on my F-150 pickup.
> >
>
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>
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>
>
--
<<http://www.oldengine.org/members/jdunmyer>>
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<<lower SE Michigan, USA>>
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