Thermostatic Air Cleaner: Service and Repair

Fig. 37 Thermal switch installation:

THERMAL SWITCH, REPLACE

NOTE: The heated air duct is attached to the snorkel either by a screw or a clamp depending on engine. If the duct is not detached before air cleaner removal, the heated air duct and stove may be damaged.

1. Remove air cleaner and disconnect hoses from switch.
2. Pry up tabs on switch retaining clip, then remove clip and switch from air cleaner.
3. Install replacement switch and gasket assembly in original position.
4. Press retainer clip on hose nipple connectors, Fig. 37.
5. Connect vacuum hoses and install air cleaner.

TRAP DOOR VACUUM MOTOR, REPLACE
1. Disconnect vacuum hoses, heated and ambient air ducts and remove air cleaner.
2. Remove trap door vacuum motor retaining rivet from bracket.
3. Lift motor away from bracket, then rotate to clear door arm and remove.
4. Rotate replacement motor to clear door arm and lower into bracket.
5. Secure motor to bracket with rivet.
6. Install air cleaner, ducts and vacuum hoses. Check trap door for proper operation.

AIR VALVE VACUUM MOTOR, REPLACE
1. Disconnect heated air duct. Make sure to remove clamp or screw before removal, as damage to the duct may result.
2. Remove air cleaner assembly.
3. Disconnect vacuum hoses from air valve motor, thermal switch and trap door (if used).
4. Remove rivet attaching air valve vacuum motor to snorkel.
5. Lift motor, tilt to one side to disconnect linkage from air valve assembly and remove.
6. Insert replacement vacuum motor assembly linkage into air valve assembly and position in snorkel.
7. Attach motor to snorkel with rivet. Make sure rivet does not interfere with movement of air valve.
8. Reconnect vacuum hoses, install air cleaner assembly, reconnect heated air ducts and check system for proper operation.