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Old 04-28-2008, 06:28 PM   #1
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For those folks with the Cummins 400 ISL engine & Allison 6 speed 3000MH transmission equipped MH, what are the typical engine coolant & transmission temperatures after about a hundred miles on flat terrain? I am running about 197 deg with the coolant and 210 deg on transmission per Silverleaf display and the Actia analog gauges.
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Old 04-28-2008, 06:28 PM   #2
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For those folks with the Cummins 400 ISL engine & Allison 6 speed 3000MH transmission equipped MH, what are the typical engine coolant & transmission temperatures after about a hundred miles on flat terrain? I am running about 197 deg with the coolant and 210 deg on transmission per Silverleaf display and the Actia analog gauges.
BTF
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Old 04-28-2008, 07:37 PM   #3
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Our 2005 36FDDS runs engine 192, transmission 205 most of the time. Hope this helps.
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Old 04-29-2008, 03:42 PM   #4
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Bigfish,

Our 2006 36 MDDS runs engine 191-194 , transmission 210-215 per Silverleaf, most of the time. On a long uphill pull with the toad on a 80 degree day the engine coolant will go up into the 200-205 range and the transmission up to 228. On downhill runs on cooler days the engine will go into the high 180s.

Also on a warm day, if I set for a long time at a stop sign with the foot on the brake and the transmission in drive, the transmission coolant has become warm enough to give me the warning light -- like 250 or so. I have learned on long stops to put the tranny in neutral, which keeps the temperature in line, and to force a downshift or take the transmission out of economy mode when I'm on a long uphill pull on a warm day.
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Old 04-29-2008, 06:01 PM   #5
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I don't have the Silverleaf system but my analogue gauges show about 190 and 200-210
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Old 04-29-2008, 06:12 PM   #6
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My 06 temps were consistent w/the above, which are within spec for Cummins & Allison according to their presentations @ gearhead sessions.

The 08 runs cooler, and within narrower bandwidth with the newly redesigned radiator setup. Engine never hits 200 on its longest uphill pull on a hot day. Radiator stays well under 200 at all times also. These are pulling a 4K# toad.
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Old 04-29-2008, 06:28 PM   #7
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Mike- Is that because it's a "cooler" coach?
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Old 04-30-2008, 03:17 AM   #8
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Jerry, It is an Engineer Mike's coach. He stood over them while they built it, but it is a cool coach to!

Ted
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Old 05-12-2008, 06:18 AM   #9
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On Saturday after pickup of the coach, the Engine Temp was in the 180-193 range for a trip of about 100 miles. The Transmission never got over 196. Will watch it going over 4th of July and Lookout pass on our way to Montana. If I remember I will post those numbers.
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Old 05-12-2008, 08:07 AM   #10
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Jerry- Yes.
Ted- No. They built it themselves without consulting me first. Then they rebuilt it to my specs in "two weeks." And a good time was had by all.
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Old 05-12-2008, 09:10 AM   #11
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by bigfish:
For those folks with the Cummins 400 ISL engine & Allison 6 speed 3000MH transmission equipped MH, what are the typical engine coolant & transmission temperatures after about a hundred miles on flat terrain? I am running about 197 deg with the coolant and 210 deg on transmission per Silverleaf display and the Actia analog gauges.
BTF </div></BLOCKQUOTE>
-----------------------------------------------
The ISL400 is equipped with a modulating thermostat that is rated 180-200 and has a top coolant tank maximum temp sec of 225. Mine runs in most condition at about 199-201 (much lower on cool days -~185)and tranny 206 or so.
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Old 05-13-2008, 03:00 AM   #12
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Cummins 330 ISC
While towing a 4600# Ford Edge on the april trip to FL & back.
Normal engine coolant temp: 180
Normal trans temp: 160
Highest engine coolant temp: 195
Highest trans temp: 180

We'll see what it is on the upcoming trip through VA, KY, TN, MO, OK, TX, NM, AZ, CA, NV, UT, WY, NE, IA, IN, OH & home to PA.
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