Air Cleaner Housing: Testing and Inspection

Intake Air Preheating Function, Checking





The preheating function consists essentially of a thermostatically controlled damper housed in the air cleaner.

The thermostat senses the temperature of the intake air and alters the position of the damper to vary the proportions of hot and cold air entering the cleaner. This enables the intake air temperature to be maintained at a constant value, irrespective of the outside temperature.

Proceed as follows if any of the following problems are encountered:
- studdering
- loss of power
- high fuel consumption





Check attachment and sealing of:
- heat shield
- preheating hose
- air cleaner housing



Damper operation, checking




Remove air cleaner housing
Undo air duct connections.

Remove housing carefully from mountings.





Remove damper housing from air cleaner
Remove cover and cleaner element.

Depress damper housing catches and withdraw housing.





Check operation of preheating components:
- bushings and mountings
- spring
- thermostat (for example, with cooling spray)

Damper position at different outside temperatures.
A = <+5°C/41°F (preheated air only)
B = approx. 10°C/50°F
C = +15°C/59°F (cold air only)





Reassemble air cleaner
Install:
- damper housing
- cleaner element
- cover





Install air cleaner in car
Place unit on mountings.

Reconnect all air ducts.





Check attachment of front intake
If required, remove grille and tighten intake mountings.





Check operation
Start and test run engine.