Bi-metal housing Note: A new gasket will be required on refitting.

Removal
1 Disconnect the battery negative lead.

2 Remove the air cleaner as described in Section 2.

3 Release any pressure in the cooling system by loosening the pressure cap (see Chapter 1), then detach the inlet and outlet hoses at the automatic choke unit. Clamp the hoses or position them with their ends facing upwards to minimise coolant leakage.

4 Mark the bi-metal housing-to-choke body joint with quick-drying paint to ensure correct realignment on reassembly.

5 Unscrew and remove the three bi-metal housing retaining screws and withdraw the housing and gasket (see illustration).

11.5 Removing the automatic choke bimetal housing

Refitting 6 Refitting is a reversal of the removal procedure.

7 Use a new gasket between the main body and the bi-metal housing.

8 When fitting the bi-metal housing, engage the bi-metal coil with the linkage lever centre slot, then loosely fit the three retaining screws, starting with the lower one (see illustration).

11.8 Automatic choke linkage lever centre slot (arrowed)

9 Before tightening the retaining screws, align the paint mark on the bi-metal body with the choke body marking (see illustration).

11.9 Alignment marks on choke unit and bi-metal housing Ford VV carburettor

10 Refit the air cleaner as described in Section 2 and top-up the cooling system as described in Chapter 1.

Automatic choke unit
Note: A new gasket will be required on refitting.

Removal
11 Remove the bi-metal housing as described previously in this Section.

12 Carefully remove the three screws within the choke housing body and withdraw the unit from the carburettor together with the gasket.

Checking
13 Carry out the checks described for the manual choke unit in Section 10.

Refitting
14 If a new choke unit is to be fitted, it will first be necessary to tap out the securing screw holes for the bi-metal housing. The thread can be tapped out using the retaining screws which are of the thread-cutting type.

Do not cut the threads with a standard tap.

15 Refit the choke housing body to the carburettor using a new gasket, then refit the bi-metal housing as described previously in this Section.