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  #1  
Old 11-11-2018, 10:20 AM
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OM642 OPERATING TEMP

What is the correct operating temperature for the OM642 engine in 2009 E320? The temp on the dash gauge is 60 to 70C. I am suspecting this is too low.

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  #2  
Old 11-11-2018, 10:24 AM
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Depends on the ambient temperature

If that was a true reading at say 20 degrees C then I'd say yes too low.

If it was -20 C then I'd say put some cardboard in between the grill and the radiator
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  #3  
Old 11-11-2018, 11:39 AM
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Thermostat time.

Surprised it’s not throwing a code for that.

My three 642s run at 85 to 90 deg C all year round. Although I live in SC where a 30 deg F day is a cold day.
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  #4  
Old 11-26-2018, 11:33 PM
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I installed a new thermostat today. I bought a laser thermometer first to verify the actual temperature. Didn't know if I had a thermostat or dash thermometer problem. The dash thermometer is accurate.
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  #5  
Old 11-26-2018, 11:41 PM
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80-85c
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  #6  
Old 01-29-2021, 05:27 PM
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Replacing mine tomorrow. It's barely hitting 80C and regens are too frequent. Hope this helps the regen frequency.

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