Increased Engine Oil Temperature

TM 9-2320-312-24-2

Testing and Adjusting Section

Excessive oil consumption can also be the result if

oil with the wrong viscosity is used. Oil with a thin

viscosity can be caused by fuel leakage into the

crankcase or by increased engine temperature.

i01283115

Increased Engine Oil

Temperature - Inspect

SMCS Code: 1348-040

When the engine is at operating temperature

and you are using SAE 10W30 oil, the maximum

oil temperature is 115 C (239 F). This is the

temperature of the oil after passing through the oil

cooler.

Look for a restriction in the oil passages of the oil

cooler. The oil temperature may be higher than

normal when the engine is operating. In such

a case, the oil cooler may have a restriction. A

restriction in the oil cooler will not cause low oil

pressure in the engine.

Determine if the oil cooler bypass valve is held in

the open position. This condition will allow the oil to

pass through the valve instead of the oil cooler. The

oil temperature will increase.