What temperature should a Cummins diesel run at?
What temperature should a Cummins diesel run at? Usually it runs 185-190. What temperature is too hot for a diesel engine? You can run up to 220°F all day long without any problems. The fluid will last a long, long time at that temperature. You can run up to 250°F for up to a half hour at a time. Above 250°F you should find a safe place to stop and idle or fast idle in park or neutral to cool the trans. What is normal operating temperature for a diesel engine? The operating temperature of the power unit is considered...