As BMW engines evolved the sleekness and design trend evolved along with them. At first one small plastic engine cover was used, then two. Now most of the engines are covered in plastic trim, in order to dress up and modernize the engine compartment. In some models the covers are bolted on, some attach with clips or rotating fasteners. It's important to check the specifics for your vehicle so you do not damage the covers when trying to remove them.
When servicing your BMW X3 engine, you may have to remove the cabin microfilter housing and engine covers to access specific components. In this article, I will show you how to remove the covers, providing easy access to the top and rear of the engine. The first few steps of this article how to remove the engine covers on an M54 6-cylinder engine. Then I will show you how to remove the cabin microfilter housing removal. Other 6-cylinder engines are similar.
Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.
Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.
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In this article, I will show you how to remove the engine covers, providing easy access to the top and rear of the engine. The first few steps of this article how to remove the engine covers on an M54 6-cylinder engine. The cylinder head cover (red arrow) and the fuel rail cover (blue arrow). Then I will show you how to remove the cabin microfilter housing (green arrow) removal. Other 6-cylinder engines are similar. You do not have to remove the cabin microfilter housing when servicing some items on the engine, like the coils and plugs. You will have to remove it when servicing items like the cylinder head cover or the intake manifold.
M54 6-cylinder engines have two engine covers. You can remove each one independently. For certain repairs you will have to remove both. Examples: for ignition coils replacement you remove only the cover on the cylinder head; for replacing a valve cover gasket on the other hand, you would remove both covers. To remove the engine covers: using a small flat head screwdriver, pry out the trim covers (red arrows) (inset).
With the cover removed, inspect the mounting insulators. There are two that are only used on the cylinder head engine cover (red arrows). If the insulators are worn, replace them with new ones. Simply unscrew using pliers and replace.
To remove the cabin microfilter housing: Working at wiper cowl, rotate each retainer 90 degrees counterclockwise to disengage. Then pull them away from cowl to be sure they are disengaged. Hold filter lid open, remove microfilter from housing by sliding it out toward engine. Then loosen the four T30 Torx fasteners (red arrows). The fasteners are captured in the housing and will not come all the way out.
Lift the front of the housing up and pull it out of the cowl to remove (red arrow). When installing reverse motion, installing at an angle, then rotating down into place. Be sure center alignment tab (blue arrow) is aligned before trying to tighten fasteners.