193 is fine. Concern starts, for me at least, around 225 and I don't want to see above 250.
At that point pull over, toss it in park and let it idle. The fluid keeps moving, the fan keeps spinning and it will cool things off far quicker than just turning it off.
Neutral, not park, keeps the oil moving through the transmission and cooler. Park just dumps the oil back into the pan.
__________________ DRINK COFFEE--do stupid things faster and with more energy ! Rockwood 5th wheel, Signature Untralite, 8244S
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193 wouldn't worry me on a newer transmission since it seems as if the newer ones run a little hotter. Modern transmission fluid, especially synthetics, are much more heat tolerant than trans fluids from even ten years ago. On my '01 Superduty my trans temps never go above 170-180 when pulling my 5er up and down mountains and it seems to hang around 145 most of the summer when driving without a trailer.
270 degrees like you mentioned in your initial post sounds ridiculously high. Unless I saw some data about temps that high being OK I am calling B.S.
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2001 Ford F250 7.3l converted to F350 specs
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Joshuajim , we are still in th early 2000's 2014 is not even 1/4 of he way through. So i'm not sure were you get 20-30 years ago. Since you are not believing an expert can you please tell use how many years you have been designing and testing transmissions.
Do you or lbr KNOW when these "tests" were done? I suspect not.
Neutral, not park, keeps the oil moving through the transmission and cooler. Park just dumps the oil back into the pan.
Nope, wrong. I can't tell you how many trans flushes I've done over the years with the cooler lines open for the machine, engine running, trans in park and fluid flowing like a river.
joshuajim, sines the engineer did not retire till 2007 I am guessing he tested up to that point, so up to 7 years ago he was testing transmissions.
Testing transmissions in well below zero degrees is NOT what a senior engineer does near the end of his career. Most likely the tests were done by him early in his career 20 or 30+ years ago.
I don't understand your logic. Where I work I do the testing but the senior engineer goes over the data to make sure it matches simulations and is within the test specifications.
Why don't you contact Mark and ask him yourself? He is on many different truck forums, including ford-trucks, thedieselstop, powerstrokenation and others. He word is highly respected.
Why don't you contact Mark and ask him yourself? He is on many different truck forums, including ford-trucks, thedieselstop, powerstrokenation and others. He word is highly respected.
Why do you regurgitate information that you have no direct knowledge of and that may be irrelevant to today?
__________________ If age is a state of mind, and I've lost my mind, I'm AGELESS, right?
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Flagstaff 5er 2014 8528 IKWS, Platinum Package, Regency Interior "Buffy" F250 Super Duty 2013 Tuxedo Black "Biff" Days camped 2014: 30
In the February 2011 issue of Trailer Life magazine RV Clinic in response from a reader about the maximum transmission temperature allowed in a 2009 Chevy Silverado, the Tech Team had this response.
“General Motors’ in-house towing team expert provided RV Clinic with this statement: The maximum allowable automatic transmission fluid temperature is dictated by the transmission oil itself. The oil begins to degrade significantly above 270 degrees Fahrenheit, so we design vehicles so that in all but the most extreme conditions, the fluid temperature in the transmission sump stays below 270 degrees F.
We allow for up to 285 degrees F in extreme conditions (i.e. towing a trailer with combination loaded at GCWR in Death Valley). But for customer usage anywhere else in the country, even at GCWR, transmission sump temperature should stay well below 270 degrees F. Above this point, certain internal components, such as seals, begin to disintegrate rather quickly. Although newer synthetic fluids can withstand higher temperatures we still recommend this (270F) as a maximum temperature.
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OK, for you regurgitating nay-sayers, I did my own test on a 2013 F150. Attached is a flow diagram for this truck so that the filming sequence makes sense. I will admit that since I had my transmission shop, engineering has changed. The output from the trans enters the BOTTOM of the radiator first, exits the top and then goes to the aux cooler.
As you can see, the temperature coming OUT of the radiator is hotter than the temperature entering. I did my first video after about a 10 minute drive and the out temperatures were about 10 degrees higher than my final video which occurred after the radiator cooled during the 15 minutes it took to do 3 videos.
So the bottom line is that while 20 to 30 years ago "the temperatures were NEVER higher", modern technology has voided that premise.
Have to admit Joshua, that does seem counter-intuitive.
It would be an oxymoron for a transmission "cooler" to make the fluid "hotter;" no?
That's what is referred to as dual purpose, in cold weather the engine coolant radiator heats the tranny fluid but under a load when the tranny is working hard and develops it's own heat (above TV thermostat temp) the coolant helps cool it down some.
Of course Toyota does things differently so I'll throw this in the mud pot, my 2013 Tundra tranny fluid does not go through the coolant radiator, it only goes through it's own cooler so yes times change and engineers change how things change, you gotta watch them engineering types there always sc***ng with something.
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Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.
My F250 doesn't put the fluid through the radiator at all either. It doesn't even flow through the tranny cooler until it is at 165 degrees. Then the T-stat opens up to allow a 10% flow into the tranny cooler. At 186.6 degrees the T-stat opens wide and allows a 100% flow. This is what I have read on how it works (from and unnamed person) and it does according to what I have seen. When my Scangauge hits 187, and I'm not pulling up a mountain, the fluid temp starts dropping like a rock usually down to about 173. Then it starts to slowly climb again. I have seen this at least a dozen times.
OK, for you regurgitating nay-sayers, I did my own test on a 2013 F150. Attached is a flow diagram for this truck so that the filming sequence makes sense. I will admit that since I had my transmission shop, engineering has changed. The output from the trans enters the BOTTOM of the radiator first, exits the top and then goes to the aux cooler.
As you can see, the temperature coming OUT of the radiator is hotter than the temperature entering. I did my first video after about a 10 minute drive and the out temperatures were about 10 degrees higher than my final video which occurred after the radiator cooled during the 15 minutes it took to do 3 videos.
So the bottom line is that while 20 to 30 years ago "the temperatures were NEVER higher", modern technology has voided that premise.
QED
Interesting video, how did you get that advertisement in the video.
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Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.
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