Thermostat - removal, testing and refitting
OHV engines Note: A new gasket must be used on refitting.
Removal
1 Drain the cooling system as described in
Chapter 1.
2 Slacken the clips and disconnect the hoses at the thermostat housing (see illustration).
4.2 Expansion tank hose (A) and radiator top hose (B) connections at
thermostat housing - OHV engine
Disconnect the radiator fan thermal switch wiring plug.
3 Unscrew the two bolts and remove the thermostat housing cover. If it is tight carefully tap it with a soft-faced mallet.
4 Extract the thermostat (see illustration). If it is stuck tight in its seat, do not lever it out by its bridge piece, but cut round it with a very sharp knife.
4.4 Thermostat location in cylinder head - OHV engine
Testing
5 To test the thermostat, first check that in a
cold condition its valve plate is closed.
Suspend it on a string in a pan of cold water together with a thermometer (see illustration).
4.5 Testing the thermostat
Heat the water and check that the thermostat starts to open at the temperature given in the Specifications. It is difficult to check that the thermostat opens fully, as this occurs at a temperature above the boiling point of water.
6 Remove the thermostat from the water and check that the valve closes as the unit cools.
If the thermostat does not operate as described, obtain a new thermostat.
Refitting
7 Refitting is the reverse sequence to
removal, but ensure that all traces of old
gasket are removed from the housing mating
faces and use a new gasket lightly smeared
with jointing compound. Tighten the retaining
bolts to the specified torque.
8 On completion, refill the cooling system as described in Chapter 1.
CVH engines
Note: A new gasket must be used on refitting.
Removal
9 Drain the cooling system as described in
Chapter 1.
10 Slacken the clips and disconnect the expansion tank hose, radiator hose and heater hose at the thermostat housing (see illustration).
4.10 Disconnect the expansion tank hose at the thermostat housing - CVH
engine
11 Disconnect the radiator fan thermal switch wiring plug.
12 Unscrew the three bolts and remove the thermostat housing from the cylinder head. If it is stuck, tap it off carefully with a soft-faced mallet.
13 Extract the retaining spring clip and withdraw the thermostat from the housing followed by the sealing ring (see illustrations).
4.13a Extract the retaining spring clip (arrowed) . . .
4.13b . . . withdraw the thermostat . . .
4.13c . . . and remove the sealing ring
Testing and refitting 14 Proceed as described previously in this Section for OHV engines.
See also:
Tailgate - removal and refitting
Removal
1 Remove the trim panel (Section 32).
2 Disconnect the wiring from the heated rear
window element, radio aerial, wiper motor
tailgate speakers and tailgate lock motor as
applicable (see i ...
Front suspension crossmember - removal and refitting
Removal
1 Remove the steering gear.
2 Support the engine with a jack and
interposed block of wood under the sump.
3 Unscrew and remove the engine mounting
nuts from the top of the mountings in th ...
Centre console - removal and refitting
Removal
1 Remove the gear lever knob.
2 Pull the rubber gaiter up the lever and
remove it.
3 Undo the four screws and remove the
console (see illustrations).
30.3a Centre console lower retaini ...