Removing and installing thermostats
40
D Draining off coolant, see page 39
Remove the three mounting bolts from coolant
neck and take off coolant neck.
Take out short-circuit inserts / thermostats.
Check the function of the thermostat insert as
follows.
D Suspend the thermostat in a bowl of water
D Heat up the water
D Using a suitable thermometer, ascertain the
start of opening and compare it with the setpo-
int value in “Service data”
D If necessary, measure the opening stroke
Replace defective thermostats.
Install thermostat inserts with ball valve facing up-
wards (TOP) with new O-ring and new seal.
Caution:
Never let the enging run without thermo-
stats or short-circuit inserts.
21
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