Man D 2842 LE 620, Repair Manual

Page: 43 / 180

1
2
Removing and installing thermostats
41
Fig.1
D
Draining off coolant, see page 40
Remove the three mounting bolts from the coolant
neck and take off coolant neck.
Fig. 2
Take out short-circuit inserts / thermostats.
Check the function of the thermostats as fol-
lows.
D
Suspend the thermostat in a bowl of water
D
Heat up the water
D
Use suitable thermometer to ascertain the
opening start and compare it with the set-point
value given in “Service Data”.
D
If necessary, measure the opening stroke
Replace defective thermostats.
Insert thermostat inserts ball valve facing upwards
(“TOP”) with new O-ring seal and new seal.
Caution:
Never let engine run without thermostats
or short-circuit inserts.