3.11 Cooling system
3.11.1 Removing the thermostat
Procedure
1.
Drain the cooling system so that the coolant level is below the thermostat.
2.
Disconnect the top hose from the water outlet cover.
3.
Remove the outlet cover.
4.
Remove the thermostat.
5.
Clean the sealing surfaces.
3.11.2 Testing the thermostat
Procedure
1.
Lower the thermostat into a vessel of boiling water so that it does not touch the sides or bottom.
2.
Opening of the thermostat must begin after less than 20 seconds.
3.
The thermostat must be fully open in less than 50 seconds. See the technical data of the thermostat.
3.11.3 Replacing the thermostat
Procedure
1.
Place the thermostat in position in the
thermostat housing.
2.
84 and 98 engines: Observe the spacing ring
that comes on top of the smaller thermostat.
3.
Fit a new gasket.
84 and 98 engines: Fit the gasket so that the
bigger hole of the gasket is on the same side
as the spacing ring.
4.
Fit the outlet cover.
M8 studs (2 pcs) can be used as guides.
5.
Connect the top hose and fill the cooling
system.
Fig. 85
3.11.4 Reconditioning coolant pump
3.11.4.1 Coolant pumps with standard bearings
NOTE: See the information for the correct tightening torques.
Procedure
1.
Drain the coolant.
2.
Remove the thermostat housing, fan and belt.
3.
Remove the coolant pump.
4.
Detach the pump rear plate and clean the sealing surfaces.
Some coolant pumps are mounted to the cylinder block without separate rear plate. They have a
closing plate sealed with an O-ring installed in the pump body. Reconditioning of this type of pump is
done according to this instruction.
5.
Unscrew the belt pulley fixing nut/screw and remove the belt pulley.
3. Maintenance
3-52 4th Generation Engines
8370 79492
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