The engine air filter element should only be replaced when it is dirty. Under normal operating conditions, the interval between replacements is up to 100,000 km. The filter element should not be cleaned with gasoline or lubricated with oil. Also, do not blow out the filter with compressed air.
Gasoline engines
Withdrawal
1. Open the clips -1- of the filter cover.
2. Slightly lift the filter cover all around.
3. Lift the filter cover and remove the filter element -1- (refer to accompanying illustration).
4. Wipe the filter housing with a damp cloth.
Installation
1. Insert a new filter element into the filter housing.
2. Replace cover and secure with clips.
Diesel engine 320d
Withdrawal
1. Remove the air filter element for ventilation, heating and air conditioning, refer to Section Replacing the Cabin Air Filter Element.
2. Open the cable channel at the bottom of the filter housing -2- and remove the cable.
3. Turn out bolts -1- and remove the bottom part of the case of the filter -2-.
4. Remove the oil fill cap.
5. Turn away bolts -1-, remove facing of the engine -2-.
6. Turn away screws -1- and remove a cover of the air filter at a head of cylinders. In the accompanying illustration, socket wrenches are visible on both left screws.
7. Pull back the filter element. Wipe the filter housing with a damp cloth.
Installation
1. Install a new filter element in the filter housing. The rear holder in the illustration points down.
2. Fix on a head of cylinders an air filter cover. Note: It is difficult to tighten the outer bolt between the air filter box and the wall of the engine compartment. It is recommended that you first fix the filter cover without the filter element in order to understand how the specified bolt is installed. Then install the filter element and fix the cover first with the specified bolt.
3. Attach the air intake hose and engine cover.
4. Screw on the oil fill cap.
5. Attach the bottom of the air box.
6. Route the cable into the cable channel at the bottom of the filter housing. Close the cable channel.
7. Reinstall the air filter element for ventilation, heating and air conditioning, refer to Section Replacing the Cabin Air Filter Element.