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.
2008 Newmar Essex 4515
2014 Honda CRV & 1980 Jeep CJ7
Owner: RVProPlus- RV/Inspection/Repair