Engine Oil Temperature Gauge
Notice: A sudden increase in oil temperature that is not caused by a load increase may indicate mechanical failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected.
During normal operation, the engine oil temperature gauge (see Fig.) should read as follows:
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Cummins engines : 180 to 225°F (82 to 107°C)
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Detroit Diesel engines : 200 to 230°F (93 to 110°C)
Under heavy loads, such as when climbing steep grades, temperatures that exceed the normal oil temperature range for a short period are not unusual. If the temperature returns to normal when the load decreases, there is no problem.
