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Pelican Technical Article:
Removing your BMW Engine Cover

Nick Czerula

 
Time: 1 hours
Tab: $0
Talent:  
Tools:
Set of sockets (8mm), T40 Torx socket flathead, Phillips screwdrivers
Applicable Models:
325i (2006)
325Xi (2006)
330i (2006)
330xi (2006)
328i (2007-2009)
335i (2007-2009)
Parts Required:
Engine cover fasteners (if you lose one)
Hot Tip:
Work with a cool engine.
Performance Gain:
Access to engine
Complementary Modification:
Replace cabin microfilter while it is out
 
   

   

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     When servicing your BMW E90 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 engine.
 
Remove six 8mm cabin microfilter lid fasteners (green arrows).
Figure 1
Open engine hood. Remove six 8mm cabin microfilter lid fasteners (green arrows).
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Lift lid up and remove from cowl.
Figure 2
Lift lid up and remove from cowl.
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Working at right side of engine compartment, remove air quality (AUC) sensor by rotating sensor counterclockwise and pulling out of cowl.
Figure 3
Working at right side of engine compartment, remove air quality (AUC) sensor by rotating sensor counterclockwise and pulling out of cowl. (green arrow)
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Then unclip wiring harness from cowl and lay aside.
Figure 4
Then unclip wiring harness from cowl and lay aside. (green arrows)
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Working at right side of engine compartment, unclip E-box cover and remove.
Figure 5
Working at right side of engine compartment, unclip E-box cover and remove. There are two clips to release indicated by green arrows.
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Then, detach rubber tab (green arrow) and remove E-box cover from vehicle.
Figure 6
Then, detach rubber tab (green arrow) and remove E-box cover from vehicle.
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Working at left side of engine compartment, unclip brake fluid cover and remove.
Figure 7
Working at left side of engine compartment, unclip brake fluid cover and remove. This is similar to removing the E-box cover on right side.
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Working at center of wiper cowl, open wiring harness cover by detaching locks (green arrows), then pull wiring harness cover off and remove.
Figure 8
Working at center of wiper cowl, open wiring harness cover by detaching locks (green arrows), then pull wiring harness cover off and remove.
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Pull wiring harness and battery cable out of bracket and lay aside.
Figure 9
Pull wiring harness and battery cable out of bracket and lay aside. (green arrows)
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Then you will have to detach the bracket for the wiring harness that runs under the cowl.
Figure 10
Then you will have to detach the bracket for the wiring harness that runs under the cowl. Use a flathead screwdriver and lever the bracket open through the top of cowl. (green arrows)
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This photo shows what the lower wiring harness bracket looks like and the areas you have to unclip.
Figure 11
This photo shows what the lower wiring harness bracket looks like and the areas you have to unclip. (green arrows)
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Working at left side of cowl, remove rubber tab (yellow arrow), then remove 8mm fastener (green arrow).
Figure 12
Working at left side of cowl, remove rubber tab (yellow arrow), then remove 8mm fastener (green arrow). Then repeat steps for right side of cowl.
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Pull housing up and forward to remove from vehicle.
Figure 13
Pull housing up and forward to remove from vehicle.
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Remove five T40 Torx engine cover fasteners (green arrows) by rotating 90 counterclockwise, then remove cover from engine.
Figure 14
Remove five T40 Torx engine cover fasteners (green arrows) by rotating 90 counterclockwise, then remove cover from engine. When installing, do not over-torque fasteners and check that lower cowl in properly aligned. A water leak can develop if not seated and sealed properly. Install in reverse order of removal.
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Need to buy parts for this project?
Click here to order parts for your BMW from our parts catalog
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  Applies to: 325i (2006), 325Xi (2006), 330i (2006), 330xi (2006), 328i (2007-2009), 335i (2007-2009)
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