Maintenance work on the fuel injection device (BMW 3 Series E30)

Replacing the air filter element

The filter element should be replaced every 20,000 km. In case of heavy dustiness, replacement should be done more often.

Removal

Remove air hose "4".

Pull the trim "3" upwards, after first turning the plastic clamps 90° to the left (arrows).

Release the quick-release fasteners on the air filter housing.

Tilt the air filter cover "2" downwards and remove the filter element "1". If necessary, unscrew the 2 nuts securing the upper part of the filter, lift the upper part. This will make it easier to remove the lower part of the filter.

Wipe the filter housing thoroughly.

In case of minor contamination, knock out the filter element with the dirty side down. An oily filter must be replaced.

Caution: Do not clean the filter element with gasoline or coat it with oil. Do not blow the filter with compressed air.

Installation

Place the new filter element into the cover.

If the top part was removed, insert the assembled filter into the mount and tighten the 2 nuts.

Caution: Ensure that the upper part is correctly installed in the rubber support.

Insert the air filter cover, place it from below and secure with quick-release fasteners.



Connect the trim and secure with the top latches.

Connect the air hose.

Removal and installation the fuel filter

The fuel filter is located in the engine compartment and must be replaced as part of the maintenance schedule every 60,000 km.

Removal

Connect the ground wire to the battery.

Warning: Do not make open fire! Fire hazard!

Clamp the hose from the fuel pump to the filter.

Disconnect the fuel hose from the filter that goes to the fuel distributor.

Unscrew the filter bracket and remove the fuel filter with the fuel hose.

Disconnect the fuel hose from the fuel filter, having first released and moved the clamp.

Installation

Connect the fuel hose going to the fuel distributor "1" to the new filter and secure the hose with a clamp.

Connect the fuel hose to the new filter, closed with clamp "3", and secure the hose with a clamp.

Insert the fuel filter and secure it to the bracket. When doing so, observe the correct installation position of the filter: the fuel flow passes through the filter from the bottom up. Arrow "2" on the fuel filter body should be directed along the fuel flow.

Remove the clamp from the hose.



Connect the ground wire to the battery.

Start the engine and check for fuel leaks at the connection points.



Removing water and replacing the diesel engine fuel filter

Removal of water from the fuel filter should be carried out within the framework of the maintenance schedule every 10,000 km, but not less than once a year. The fuel filter should be replaced every 20,000 Nm.

Loosen the air release bolt "8" by a few turns.

Place a suitable container under the drain plug.

Model 324td: Press the drain valve "6" on the cover and drain the water sediment until clean diesel fuel flows out.

Model 324td: Bleed air from the fuel system (on the 324d model, air is removed from the fuel system automatically when the engine is started). To do this, turn the hand pump wheel "7" by 90° (¼ turn) and pump until fuel comes out through the air release bolt "8". After that, turn the hand pump wheel 90° again and thus lock the pump.

Tighten the air release bolt "8".

Replacement

Drain the sediment from the filter as when removing the water.

Unscrew the fuel filter "4" from the filter flange "9" by hand or, if it is firmly seated, with a tension wrench, for example, HAZET 2170. If the heating element "2" turns in the process, hold it with a leather belt or tension wrench.

Replace cover "5" onto the new filter.

Fill the new filter to the brim with diesel fuel and screw it on by hand.

Caution: Do not overtighten the filter. After the gasket is seated against the flange, tighten it another ½ turn.

Model 324td: Bleed air from the fuel system.

Retighten the air release bolt "8".

After the test drive, check the tightness of the fuel system.

Information obtained from this online resource «www.bmwman.ru»