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Old 09-22-2007, 06:57 PM   #1
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I have 17K+ on my 06 KSDP (3910) w/ISL 350 Cummins and, of course, the Allison 3000MH. I just drove my rig for the first time in a long time with no toad. Was picking it up from the Knoxville Cummins dealer having had the engine recall completed, and I noted what I thought were pretty high temps on the engine and tranny. The engine ran between 195-203 and the tranny between 200-210 (hit a high of 214 one time). Ambient temp was only 84 and I was driving 45-55 MPH with some stops at lights (4-lane highway from Knoxville to Morristown through some small towns). I thought that was pretty high. Like to hear what others are experiencing on their ISL 350's? Thanks guys, love the forum!
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Old 09-22-2007, 06:57 PM   #2
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I have 17K+ on my 06 KSDP (3910) w/ISL 350 Cummins and, of course, the Allison 3000MH. I just drove my rig for the first time in a long time with no toad. Was picking it up from the Knoxville Cummins dealer having had the engine recall completed, and I noted what I thought were pretty high temps on the engine and tranny. The engine ran between 195-203 and the tranny between 200-210 (hit a high of 214 one time). Ambient temp was only 84 and I was driving 45-55 MPH with some stops at lights (4-lane highway from Knoxville to Morristown through some small towns). I thought that was pretty high. Like to hear what others are experiencing on their ISL 350's? Thanks guys, love the forum!
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Old 09-23-2007, 05:06 AM   #3
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Welcome to the forum. Though I do not have an ISL I am familuar with there operating limits as these are fairly similar with all the newer Cummins engines. The engine running up to 203 is normal. The tranny, however, is displaying temperatures higher than would seem normal. In my opinion, while a transmission temperature of 202+ would be within an acceptable range, yours should be even cooler than that in all lightlyhood due to the reduced highway operating speed.
Perhaps you will get more input from similoar rigs from other members.

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Old 09-23-2007, 06:33 AM   #4
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I have a 2005 DS with a 370 hp Cummins ISL. My coolant runs 201-203 and the transmission fluid runs 204-208 and those temperatures stay at those levels whether it is 50 degrees or 90 degrees outside. I talked to both Spartan and Cummins and they told me that is normal for my engine and transmission.
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Old 09-23-2007, 08:55 AM   #5
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'07 ISL(19k miles) here engine 180 to 196(have seen 202 under severe conditions-full load an 19 degree grade) and Tranny 150 to 185.
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Old 09-23-2007, 09:08 AM   #6
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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 Gyrene:
I have 17K+ on my 06 KSDP (3910) w/ISL 350 Cummins and, of course, the Allison 3000MH. I just drove my rig for the first time in a long time with no toad. Was picking it up from the Knoxville Cummins dealer having had the engine recall completed, and I noted what I thought were pretty high temps on the engine and tranny. The engine ran between 195-203 and the tranny between 200-210 (hit a high of 214 one time). Ambient temp was only 84 and I was driving 45-55 MPH with some stops at lights (4-lane highway from Knoxville to Morristown through some small towns). I thought that was pretty high. Like to hear what others are experiencing on their ISL 350's? Thanks guys, love the forum! </div></BLOCKQUOTE>

I think the temperatures are ok. MY ISL 400 runs 199 and tranny 204 under all most all conditions. I know from my work with Cummins that these engines are designed to run hot and can go to 210+ without concern. I attended an Allison session last week and they said hot oil check should be done once tranny reached normal which they said was 160-200. I was going to question this level later but forgot by time session was over. I do recall that in his talk he used a range much higher when discussing operational issues. If really concerned,you could use your keypad to see if any diagnostic codes were thrown up.
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Old 09-24-2007, 05:31 PM   #7
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Your engine Tempsare good These engines need to run warmer it burns off the gunk.

The Engine oil temp will always be a little higher than water temp!!
Rick
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