Air filter

Removal and installation

There are several different designs of air filters which are described below. To remove the air filter, depress the cover fastening brackets, unscrew the fastening nuts (in the presence of) and remove the filter cover. Remove filter element (see "Vehicle maintenance work").

To remove the filter housing, disconnect the hot air duct from the deflector on the exhaust manifold, unscrew the fastening nuts inside the filter housing and carefully lift the filter housing, disconnecting the vacuum tubes and the crankcase ventilation hose.

On early release cars (until May 1975) a rectangular air filter was installed, which was located on the right side of the engine compartment. The filter is equipped with a temperature regulator, the damper of which is controlled by a thermostat. Access to the thermostatic damper opens after removing the filter cover, secured with four clips.

Later 1.1 and 1.3 engines have a large round air filter attached directly to the carburetor. A damper is provided to regulate the air temperature ("winter summer") or (since August 1979) temperature controller with vacuum damper actuator and thermostat.

The thermostat consists of a temperature valve (1), housings with thermostat (2) and dampers with vacuum drive (3, fig. F:3). To check the operation of the damper, disconnect the hose leading to the damper from the temperature valve and create a vacuum in it by sucking air through your mouth. When air is sucked in, you should hear the sound of the damper operating. To test the thermostat, remove the thermostatic damper housing. At air temperatures above 20°C, the damper in the warm air supply pipe must be closed, and at temperatures from -20°C to +20°C - open 1/3.




Larger displacement engines have a rectangular-shaped air filter located on top of the engine and equipped with a thermostat (fig.G:4).



On all fuel injected engines, the air filter is located under the air mass sensor in the engine compartment. To gain access to the filter element, separate the top half of the air filter housing from the bottom half (cm "Vehicle maintenance work").