Thermostat (H.l 30) - Hatz 2-4L30 Workshop Manual

A 30.00 Liquid cooling
A 30.40 Thermostat (H.L 30)
–
Preparations:
– Drain the coolant (only needed if the
upper edge of the radiator is higher than
the thermostat).
– Detach the coolant line from thermostat
cover (202/3).
Dismantling:
– Take out retaining screws (202/1) with
spring washers (2).
– Lift off the thermostat cover (202/3).
Remove sealing ring (4) and pull out
thermostat (5).
Checking operation of thermostat
insert:
Note:
The temperatures stamped on the
thermostat insert indicate the start of its
opening movement and the maximum
operating temperature.
– Suspend the thermostat insert and a
thermometer in the centre of a vessel
filled with water; see Fig. 203.
– Heat the water while stirring it.
– Check that the thermostat insert opens
at the temperature stamped on it.
– Remove the thermostat insert and check
that it closes correctly.
– Renew thermostat insert if defective.
Assembling:
– Clean the sealing faces on the cylinder
head, the thermostat cover and the seat
of the thermostat insert.
– Install the thermostat insert, using a new
sealing ring (the arrow stamped on it
indicates the direction of flow).
– Attach the thermostat cover again and
tighten its screws uniformly.
2
L / M . . 09.96
2
6
202
203
1
3
4
5