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Old 12-01-2020, 07:22 PM   #1
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Cummins ISM 500

I just bought a 2008 Newmar Essex with a Cummins ISM500 w/4000 Allison transmission Bringing it home (About 200 miles) the engine temperature, once warmed up stayed at 183 degrees. Every once in a while it may go to 182 degrees. The Allison heat ranged 145-170 degrees. Does this sound normal for the ISM 500?
I was expecting closer to 190-205. I was in Florida so pretty much level ground.
Max turbo PSI was 28.9. Didn't have anything to read HP. I was not towing.
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Old 12-01-2020, 08:04 PM   #2
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Your fine!
I just drove from Jacksonville to Melbourne on I-95 today. Your temps are exactly what I saw today. It was pretty cool today in Florida. It’ll run a little hotter when the weather warms back up.
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Old 12-05-2020, 03:33 PM   #3
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Mine always runs 195 to 205 @ 67 MPH
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Old 01-02-2021, 03:59 PM   #4
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What model and year are is your motor
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Old 01-02-2021, 05:36 PM   #5
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Not sure which one your are talking to but mine is a 2007 Essex with ISM 500 HP built in late 2006
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