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Xmission Temps

Yahoo Message Number: 67888
Hi,

Just wondering what xmission temperatures folks that are driving Allure 430s are seeing. Mine runs from 212F to 240F depending on torque. Idling in drive while sitting in traffic makes the xmission temperature really zoom upwards. I have the Allison 3000 series xmission and the Cummins 400 ISL engine. Bus has the tag axle. Thanks for any insight other operators can provide.

Best - Scott
2006 Allure 430
#31349

Re: Xmission Temps

Reply #1 –
Yahoo Message Number: 67889
Scott:

What water temps are you getting?

Do you have an analog gauge and a Silverleaf panel? Is your high temp coming from the analog or Silverleaf?
My analog gauge is always reading high, so I pay attention to the Silverleaf. 206 deg. in stop and go traffic.

Gil Bourdon
C-9

Re: Xmission Temps

Reply #2 –
Yahoo Message Number: 67894
Scott

My 430 with C-9 transmission temperatures can reach 218 in traffic. I would be concerned if I saw 240. I believe the C-9 runs hotter than the ISL engines, mine fan comes on high at 206-208 and Allison has told me that 215-220 is not an issue and the transmission will go into limp mode before you can damage it. I would call them about 240 degrees.

Dan 2006 Allure 31348

Re: Xmission Temps

Reply #3 –
Yahoo Message Number: 67895
Scott:

I suspect that the 240F temp reading was off the analog guage. If this is fact, I wouldn't worry about the temp. The temp sensor for the analog guage is located in a different location then the digital Silverleaf sensor and will read 20-25 deg higher than the digital sensor. This was my observation when I swhich from the analog guages to the Silverleaf VMSpc.
To put your mind at ease, either get a Silverleaf VMSpc or when sitting at a signal light put the transmission into Neutral, the temp will not rise.

John Beach

06 Allure 430 31309

-- Message--

Re: Xmission Temps

Reply #4 –
Yahoo Message Number: 67896
Guy's

The trans temp sending unit (analog) is in the line, just outside the trany, running to the cooler. This should be the hottest fluid in the unit.
Ned Herrmann

06 Inspire 51677 C-9

Re: Xmission Temps

Reply #5 –
Yahoo Message Number: 67897
We would get high readings (Silverleaf). By that I mean about 20-30+ degrees above engine temp and in stop and go traffic could get to 228.
After we had a radiator leakw e replaced the radiator with the heavisest duty steel+copper that we could get (OMCC did the work) and now the trans temps rarely get more than a few degrees above engine temp. Even running in the Nevada desert where last year we were up to 115+ in the shade we never saw more than 218 on the transmission.
BTW, prior to the radiator replacement we did have Allison look at it and they told me that their sensor never showed an overheat and that the shift pad/dash shoudl have shown an overtemp if there was a problem...although they did tell me that the temps we were seeing were higher than what should be expected.

Re: Xmission Temps

Reply #6 –
Yahoo Message Number: 67899
Scott,

Do you have any record when the transmission was serviced, and what fluid it has in it? If not, have the oil and filters changed, be sure Allison filters are used, and install synthetic transmission fluid. It will drop the temp. Transmission should run engine temp in normal over the road driving. More on hard pulls.

Leonard

97' Magna 5418

Re: Xmission Temps

Reply #7 –
Yahoo Message Number: 67913
Thanks everyone for the information.

I do have a Silverleaf and it reports a lower temp than the analog gauge. I believe the analog gauge picks up the temperature before the oil cooler. What I had quoted was coming off the Silverleaf. My xmission usually runs 25-30F hotter than engine coolant on average which I'm told in normal. Engine will usually max out at 210F but most times it stays in the high 190s. The xmission fluid has been changed recently and it has always been (and still is) Transynd. I've never had the xmission report an overheat condition. I too had my radiator replaced with a copper/steel unit. It has improved overall cooling a little bit. I can thank the idiots at JB Radiator Specialties for rigidly fastening a steel U bracket to an aluminum core. These two metals expand at different rates with aluminum having the greater coefficient of linear expansion. Over time and 200+ degree temperature swings, the cooling tubes forced their way into the headers causing a failure. From a design perspective, we aren't splitting the atom on this one.

I do shift into "N" anytime I'm

expecting to sit idle. This keeps the xmission temperature from climbing. I understand this comes from the heat build up in the torque converter owing to friction in the fluid. The fluid looks in good shape.

Best - Scott
2006 Allure 430
#31349

At 01:23 PM 1/26/2011, you wrote:

Re: Xmission Temps

Reply #8 –
Yahoo Message Number: 67967
Scott,

I have an 2006 Allure 40' about a hundred numbers after yours, with the ISL 400 and Allison transmission. My loaded travel weight is around 39K lbs, and I tow a Grand Cherokee.
On the Silverleaf - engine temps normally sit between 198-203 degrees and transmission temps are at or within 3-5 degrees of the engine. Even when pulling long grades when the engine temp rises to 210-215 degrees, the transmission stays around 205 degrees.
I used to get much higher engine and transmission temps but never had problem after removing the rear mud flap on the recommendation of the former engineering manager at CC. Didn't think it would make any difference but now would never go back.

Al

2006 Allure #31440

Re: Xmission Temps

Reply #9 –
Yahoo Message Number: 67971
AL

With the mud flap removed how much dirtier does the toad get?

Brian O'Day

2006 intrigue #51565

Re: Xmission Temps

Reply #10 –
Yahoo Message Number: 67987
Al,

Thanks for your response. I'd never would have considered the mud flap to impede airflow. We aren't due to leave for another 4+ months. It's easy to remove it and I will try this next trip and see what happens. We tow an 8K Lb van loaded with gear. Very interesting.

At 11:52 AM 1/28/2011, you wrote:

Re: Xmission Temps

Reply #11 –
Yahoo Message Number: 67990
My 2004 intrigue ovation at 42 feet, tag, and a C12 with a 4000 allison tranny never goes above 205 on the silver leaf at 1540 lbs of torque going up a mountain and staying with traffic. I do not have a mud flap on my coach either. My coach tips the scale at about 39,500 loaded without a toad.

Dallas intrigue 11688

Re: Xmission Temps

Reply #12 –
Yahoo Message Number: 67992
Took my mudflap off two years ago because it look like crap. Transmission temps went down between 10 and 14 degrees depending on the situation. PLUS, MPG went up by .5 MPG. Go figure. Don't need the flap with the big flaps behind the wheels (unless you want to advertise for CC)>

George

'04 Inspire 51061

Re: Xmission Temps

Reply #13 –
Yahoo Message Number: 68012
Brian,

The rear mud flap is for advertising. There are mud flaps directly behind the rear wheels and substantial overhand before the back end. The CC manager said Marketing wanted the flap, Engineering didn't. Marketing won. Over time, Engineering made the flaps shorter or notched them around the tow hitch area, but he still recommended the flap be removed for optimal cooling performance.
On some models, and particularly my 2006 Allure, the rear mud flap came to within an inch or two of the ground at normal ride height. When bouncing down the road, the rear flap would rub along the road and kick up gravel onto the tow car. This was especially true in turns. Looking at my rear flap, the corners were worn off at an angle. I would find gravel on the tow car windshield wipers and had numerous "rock dings" on the front of the car. With the mud flap removed, rock damage has dropped by 95%.
An alternative to removing the rear flap, if you like the look, is to install an eye bolt at the bottom center of the flap. Then when you drive, use the eye bolt to tie the rear flap to the tow hitch.

Al

2006 Allure #31440

Re: rear mud flap

Reply #14 –
Yahoo Message Number: 68014
Interesting comments on the beneficial effect of removing the rear mud flap. Sounds like a relatively useless extra weight item. I had an old bus with a similar flap mounted in front of the engine but behind the rear wheels and understood part of its function was to produce a low pressure area under the coach to facilitate air flow through the side mounted radiator. Apparently CC's are mounted too far back to produce the same effect - in fact they probably have the opposite effect of increasing the pressure under that part of the coach and reducing radiator air flow..

Jim M

'02 Intrirgue #11410 ISL 400

Re: rear mud flap

Reply #15 –
Yahoo Message Number: 68016
Jim, I took mine off 15,000 miles ago. My MPG went up a few 10ths, some claim 0.4 mi. Anyway, the outcome was at least a positive.0.2 MPG improvement. At around a 7 MPG average and $3/gal for diesel that's $12 per 1,000 mi. for 0.2 MPG improvement of driving, not a lot of $$ but every bit counts. So for me, a $180 savings so far. For 0.4 MPG improvement, you'd double the savings.
I have had no damage to the toad, as some fear. With the toad on, I and no one else misses it. Not one person, while camping, has asked about it not being there.

Lee
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Lee Zaborowski

07 Intrigue 12153, Cat C-1
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Re: rear mud flap

Reply #16 –
Yahoo Message Number: 68023
While en route last September to a Country Coach Texans Rally in Creed, Co., the right hinge pin broke and I must have drug it along for 20 miles before someone pulled up beside and said I was dragging it. I took it completely off and left it in a vacant lot in Post, TX. I told Ted Wright about it when I arrived in Creed and he told me that Bob Lee had told him years ago that the only purpose for the mud flap was advertising. I left the thing in Post when I returned home. Rod5206, 42' '07 Allure 470