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jtaylor0521's avatar
jtaylor0521
Explorer
Jul 30, 2013

Diesel engine running hot at 58 mph in the mountains

I have a 2005 Monaco Cayman 37' with a 300 hp cummings engine. Yesterday was the first time we have encountered mountains. I was running in 5th gear at 58 mph up and down the hills on I40. I notice...
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Terryallan's avatar
Terryallan
Explorer II
Jul 30, 2013
The higher RPM does 2 good things. It circulates the coolant more, Cooling the engine, and transmission.
Somewhere in your manual. there should be a section telling you what your Minimum RPM should be. In the big truck. Our minimum was 1500. We never ran it under that. Lugging is NEVER good for the engine. Can cause it to use oil, and will waste fuel

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