SHB 803 en – Edition 2.4 * 803s410.fm 4-11
Engine
☞Warm up the thermostat in a container with water
☞Check whether the thermostat opens at the specified temperature (check with a tem-
perature gage)
➥Thermostat opening temperature: 69.5 – 72.5 °C (157.1 – 162.5 °F)
4.11 Checking the thermal switch
☞Remove the thermal switch
☞Warm up the thermal switch in a container with coolant or oil
☞Measure the resistance of the thermal switch as shown by means of an ohmmeter.
➥The switch must allow the coolant to pass at a temperature of 107 – 113 °C (224.6 –
235.4 °F)
4.12 Oil pressure switch
☞Remove the cable connection from the oil pressure switch (in the area of the cutoff
solenoid)
☞Start the engine, check for correct idling speed
☞Measure the resistance of the oil pressure switch as shown by means of an ohmmeter.
➥Oil pressure switch OK: infinite resistance
➥The oil pressure switch is malfunctioning if the oil can pass
Thermometer
Thermal switch
Thermometer
Test prods
Fig. 16: Checking the thermal switch
Measurement prod
Fig. 17: Oil pressure switch
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