Technical data

47
Repair instructions
Thermostat replacement
Special tool: 9996863
1
Drain the requisite amount of coolant.
2
Shut the fuel taps and remove the fuel filters from the
thermostat housing lid.
3
Remove the thermostat housing lid and lift the
thermostat out.
4
Remove the old seal ring by tapping it with a drift so
that it tips and can be removed.
Note. Be careful not to damage the mating surface of
the seal ring against the thermostat housing.
5
Clean the mating surfaces in the thermostat housing
and lid.
6
Put a new seal ring on mandrel 9996863.
Tap the seal ring carefully until the mandrel bottoms in
the thermostat housing.
7
Put the new, or checked and approved thermostat into
the housing and install the lid. Use new seal rings.
8
Install the fuel filters. Open the fuel taps and vent the
fuel system if necessary, in accordance with the
“Group 23, Fuel System” instruction in the workshop
manual on page 39.
9
Top up with coolant.
See “Filling coolant” on pages 26 and 27.