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Filters

Author : Trevor White, Chris Jones & Gary Millette Posted on : 03/12/2004
Model : BMW, 5 - Series (E34) 1989-96 Category : Engine
Source : http://www.bmwe34.net
 


A clean air filter removes abrasive dust, insects and leaves from the air before it enters the engine. These contaminants cause excessive wear to moving parts.

A clean fuel supply is dependent on the fuel filter which removes contaminants like rust and water from the fuel supply. Eventually it will become clogged with debris, causing a restriction. Major problems such as hard starting, lack of high speed power and stalling are often a result of a clogged filter.



Air filter
  • Bmw E34 New filter


    • Probably the easiest of all maintenance. Remove the spring clips around the filter housing, remove the old filter, clean the filter housing, place a new air filter and... voila!
    Always install the new filter in the same position that it was before.



    Fuel filter
  • Screw driver
  • 2 x needle nose vise-grip or hose pinchers.
  • WD 40.
  • 10mm socket + ratchet wrench
  • Rugs


    • 1. Lift the rear of the car. Spray WD 40 on the hose clamps and 10mm bolt.
    2. Loosen the hose clamps.
    3. Remove the 10mm bolt.
    4. Place the two needle nose vise-grip or hose pinchers near the two hose clamps.
    5. Remove the two hose clamps and change the fuel filter.
    6. Installation is reverse of removal.

    Always install the new filter in the same direction that it was before.


    A/C microfilter (Highly detailed procedure)
  • New microfilter
  • Screw drivers

    1. Remove the glove box.
    2. Remove carpeted trim panels and panel above glove box.
    3. Remove the two screws holding the ventilation duct. Remove the duct.
    4. You have to remove one A/C probe and loosen another and use a little torx wrench.
    5. The green thing is the cover for the microfilter. The black slab is an A\C control unit which was loosened but not removed. The hole in the cover is where another A\C control unit was unplugged and removed.
    6. There is a knob at the top and a screw at the bottom, the same size torque screw that is holding other parts together in that area. Once removed the filter is recessed at the back.
    7. Installation is the reverse of removal.

    Procedure on a right hand drive model:
    The filter is on the same side so the removal of the glove box is not needed. All you need to do is to first remove the under tray (three screws and 3 cam locks at the bulkhead) and then remove the carpet followed by the footwell airduct. The procedure is then exactly as stated from the removal of the screw hole for the carpet trim and sword.

    Richard Redding details that for r/h drive cars the pedals hinder easy access.
    The grey bracket on bottom of the main a/c housing ( can be seen on your photo) slides out of its housing to make access to the bottom torx screw easier.
    My car had a control card situated between the filter housing and the bulkhead. This is easily unclipped and moved our of the way , with wires attached. Otherwise it hinders access to the filter cover.

    The filter came out in two parts. The new filter looks like one part but is split longitudinally. To put the new filter in it is best separated longitudinally and the top section put in first and then the lower section slides into the top part. It is a tight fit with the clutch pedal in the way.

    The job was quite tricky for a first timer and judging by the state of the filter that came out and the rubbish in the housing a job that even dealers avoid unless they have to!


    Thanks to Trevor White, Chris Jones & Gary Millette
    •  

    Pictures

    Picture 1
    Picture 2

    Click on the thumbnails to see larger images.

     

    References

  • http://www.bmwe34.net
    •  


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