22
TO DRAIN THE COOLANT.
Remove the filler cap on header tank.
Drain the coolant through tap or plug hole in front of the
crankcase, see Fig.10.
Close the tap securely after draining.
Refill the system with correct water/anti freeze mixture.
Let the engine idle for 20-30 minutes with the filler cap off
and top up.
CHECK OR REPLACE THERMOSTAT
The Thermostat Housing is shown on Fig. 1, position 19.
Loosen the rubber bend between the thermostat housing and the
water cooled exhaust manifold (or header tank on L4.139 LB)
Unscrew the thermostat housing bolts and remove the housing
with thermostat.
To check the thermostat function, put it into hot water. The
thermostat is set to open at 74
Ε
C. It should close again when
put into cold water.
If the thermostat is defect, it must be replaced.
The gasket should also be replaced before assembling the
thermostat housing.
Ensure that all hose clamps are properly fixed and drain tap
closed, before refilling with water/anti-freeze mixture.
