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Normal Temp Range


ewacowboy

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2007 Freightliner M2-106 with Mercedes and Allison 6-speed. Just started our long range adventure and have noticed the engine temps run around 180 and the transmission around 165 cruising at 1650 RPM. When pulling a grade both temps run higher - which I would expect. While running steep grades the engine runs up to about 195 before the engine fan kicks on and the transmission can run as high as 200 - 205.....are these normal operating ranges? We're usually running the AC at the time.

 

Jim

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Cowboy - Just a question - could this be the first time you had real gauges? I know that my Ford truck the gages were just fancy idiot lights. I put real ones in and they read in the same temps as yours. The HDT temps run in the same range.

 

Common temps for running engines.

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Cowboy - Just a question - could this be the first time you had real gauges? I know that my Ford truck the gages were just fancy idiot lights. I put real ones in and they read in the same temps as yours. The HDT temps run in the same range.

 

Common temps for running engines.

Hahaha....yes, that's why I'm asking. I've never seen a tranny run over 200 so I thought I'd ask.

 

Thanks for the support guys!

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  • 1 month later...

Remember, that within reason, the trans and oil are dumping heat into the engine coolant / radiator. Also, say during startup, as the engine heats, it is going to pass heat 'backward' into the oil and tyranny. So it is always the whole mass, engine coolant, oil and trans oil all 'following' each others temps

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