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  #25  
Old 03-08-2014, 01:34 PM
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Re: Transmission & Oil Temperatures

ZF-Lifeguard8, the fluid used in the 8HP70, has a flash point of 215 Celsius, which is 419F and a Boiling Point of >280C.

So, don't get your undies in too much of a bundle about your tranny temps in the 200 range .

Personally, I will change the tranny fluid and filter at 60k. But, then again, I am entirely anal LOL! .
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  #26  
Old 03-19-2014, 06:20 PM
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Re: Transmission & Oil Temperatures

Quote:
Originally Posted by suzieque View Post
I had found a post once that gave the play by play state of ATF as it heated, e.g. at a certain temp it begins losing its ability to properly engage.

I will try to find that again.
Not exactly what I was looking for but, the charts seem to match what I had read, and sometimes pictures are better than words.

Trans Temps

My original wording "losing its ability to properly engage", should have read "plates slip", sorry about that.
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  #27  
Old 06-09-2014, 05:35 PM
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Re: Transmission & Oil Temperatures

There has been no posting here for awhile, so everyone may feel that the issue of high temps when towing up steep grades in the mountains has been pretty thoroughly explored. But I will add my recent experience to the list. We towed a 21' TT (4500 lbs fully loaded) from the Midwest to Utah out and back through Colorado three weeks ago. We too noticed the quick temperature rise as we climbed the incline to the Eisenhower tunnel, the needle going all the way to the white line next to the red zone, and the same thing happened going over the Vail pass a few miles down the road. I was really worried about what would happen when we came back over Wolf Creek Pass. But remembering that I had essentially floored it going over those two earlier passes, I decided to try just maintaining rpm's at 2000-2500, which all that is required for maximum torque. This worked great-- the engine temp still quickly increased, but the oil temp topped out at 244 and the water temp guage stopped at the halfway point in the third quarter of the guage. Speed was comfortable -- 40 to 45 mph (no faster than I wanted to be going as I started the steep descent anyway), plenty of power, and the car just cruised like it could have gone all day in that range. I had the oil changed when we returned, and the dealer said it looked fine. Mileage for the trip was excellent -- 16 mpg -- and the car pulled so effortlessly under all other conditions that I am fine living with being a litttle watchful towing over the highest mountain passes as the price to pay for all of the other benefits of this car, including its outstanding mileage when not towing.
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  #28  
Old 06-09-2014, 05:58 PM
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Re: Transmission & Oil Temperatures

Thanks for the update. Of course, max torque isn't max power. I think the final analysis is that the cooling system is adequate under most conditions where lower RPMs are maintained but under maximum sustained power (at higher RPMs) the cooling system may not keep up This is no different than any other standard duty vehicle. Max power for short term acceleration isn't a problem.
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  #29  
Old 06-11-2014, 08:01 AM
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Re: Transmission & Oil Temperatures

I've been wondering about normal temp ranges, too. I'm bringing mine to the dealer (in San Jose, CA, USA) and put this down as a question to ask the service department. If I find out, I'll report back.
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  #30  
Old 06-11-2014, 08:24 AM
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Re: Transmission & Oil Temperatures

Just towed today for the first time in the new Diesel.

Averaged 17 mpg towing a 4300 lb car trailer. Kept the transmission in Sport the whole time and manually shifted down to 7th for any hills or grades. Kept the rpms at 2k or above.

Trans temps stayed between 179-195.

Oil temps 221-227

Water never rose above halfway.

Speeds fluctuated between 70-80.

I'm extremely impressed.


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  #31  
Old 06-11-2014, 08:48 AM
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Re: Transmission & Oil Temperatures

Quote:
Originally Posted by Sasportas View Post
Just towed today for the first time in the new Diesel.

Averaged 17 mpg towing a 4300 lb car trailer. Kept the transmission in Sport the whole time and manually shifted down to 7th for any hills or grades. Kept the rpms at 2k or above.

Trans temps stayed between 179-195.

Oil temps 221-227

Water never rose above halfway.

Speeds fluctuated between 70-80.

I'm extremely impressed.
You have the correct approach to towing IMHO. Lugging the engine heats up the tranny from excessive continuous torque. Sport mode shifts later to avoid this, as does your manual downshift in grades. 2k rpm has been documented by many to keep water/oil temps in check.
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  #32  
Old 06-13-2014, 08:00 AM
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Re: Transmission & Oil Temperatures

Quote:
Originally Posted by ExcursionDiesel View Post
You have the correct approach to towing IMHO. Lugging the engine heats up the tranny from excessive continuous torque. Sport mode shifts later to avoid this, as does your manual downshift in grades. 2k rpm has been documented by many to keep water/oil temps in check.
My service tech advisor at my dealership in San Jose, CA agrees with you - keep the tranny in Sport mode to keep tranny temps lower while towing.
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  #33  
Old 06-13-2014, 12:48 PM
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Re: Transmission & Oil Temperatures

So, yeah, when I dropped off my 2014 JGC EcoDiesel at my dealership yesterday morning for a fix, I brought my list of questions to ask. (The fix, BTW, is for the fuel filler door flap that wasn't aligned well when I bought my Jeep. They had to order the arm for that, and they're installing it.)

As for normal operating temp ranges for oil and tranny, I asked the service tech guy. He searched their internsl tech talk system for it (internal-to-Jeep dealers service personnel) but wasn't able to find anything... yet. He wants to keep searching, so hopefully we'll have an answer from him soon.
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  #34  
Old 07-01-2014, 12:31 AM
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Re: Transmission & Oil Temperatures

I see that others are posting their 2014 Ecodiesel towing experiences, so thought I would share as well.

Just a few weeks ago I was towing my off road/utility trailer, loaded to about 3800#. Power was never a problem and I saw just under 20mpg for the trip which is outstanding! However, when driving up the 14 North from Mojave @55mph, ambient was about 80F and it is a mild but steady incline. I just happened to glance down at the temp gauge and it was in the RED! I backed off the throttle immediately and thumbed the controls to check the other temps. Trans was a little warm @213, but the oil was @255!

I backed it down to about 45 and was able to keep the temp gauge in the last white line. Tried downshifting, sport mode, even turned off the climate control, but nothing helped. As soon as I crested the rise, the temps came down immediately, almost too fast. This routine played out the rest of the trip. I had just had the 10k service performed before the trip, and rechecked all the fluids. Needless to say I am not happy. I could see it needing to be babied at or near its rated towing capacity but not at half.

Going through the process, getting it "looked at" this week.

Everything else about it is GREAT! But it needs to be able to tow comfortably.
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  #35  
Old 07-01-2014, 08:48 AM
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Re: Transmission & Oil Temperatures

I wouldn't worry to much seeing temps of 255F on grades when towing.
The Flash Point of Pennzoil Ultra Euro L is 420F......
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  #36  
Old 07-01-2014, 10:52 AM
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Re: Transmission & Oil Temperatures

I have also experienced this problem and have posted on this issue previously, but saw the following recent post by "Parry" in the Jeep Cherokee Diesel Forum, under the thread called "Nervous about overheating while towing"

"I was out this weekend to the mountains and got to try towing up the Highwood pass on hwy 40 which has some longer steep climbs. I tried your suggestion of holding it in the 2000-2500 range and had very similar results. Have to say it freaks me out a bit. I stumbled onto something while playing with the paddle shifters. I found that while climbing if I kept the rpm's hovering around the 3000 Mark and feathered the throttle (not foot to the floor) I could come very close to maintaining the speed limit and the engine temp would drop back down to almost normal at the half way mark to the second quadrant. I have a lot more confidence in it after this last trip. It makes me wonder if the water pump doesn't have enough capacity at the lower rpm's."

I live in the Midwest and will not be towing in the mountains again until next summer. I would be interested in other users posting their results using this technique in the mountains.
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