300CD (123.153) L5-3.0L DSL Turbo (617.952) (1982)
Engine Oil Cooler Thermostat: Testing and Inspection
NOTE: To obtain a favorable operating temperature of engine oil at a faster rate, a thermostat with an opening temperature of 110 °C (formerly 95 °C).
part No. 117 180 00 75 has been installed in oil filter since December 1979.
The thermostat 110 °C can also be installed in engines manufactured at an earlier date as a spare part.
Start of series
Checking
1
Exchange oil dipstick for flexible heat sensor.
2
Run engine at increased speed and watch tele-thermometer.
3
At an oil temperature of 110 ± 4 °C or 95 ± 4 °C, depending on thermostat installed. a distinctive increase of oil temperature on oil cooler should
be noticeable (manually).
If not, replace thermostat. See: Service and Repair