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Pelican Technical Article:

Engine Cover Removal

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0

Talent:

*

Tools:

T25 Torx driver, E14, 16mm wrench, rags

Applicable Models:

Mercedes-Benz GL320 (2007-09)
Mercedes-Benz GL350 (2010-14)
Mercedes-Benz GL450 (2007-14)
Mercedes-Benz GL550 (2008-14)
Mercedes-Benz GL63 AMG (2013-14)

Parts Required:

New air filters

Hot Tip:

Check the condition of the mounts

Performance Gain:

Access to engine

Complementary Modification:

Change air filters

There are two engine covers on the GL450 along with two air ducts. You will need to disconnect one side of the strut cross brace to remove the rear cover.

With the hood open you can see the two engine covers, the front one (red arrow) that comes off for just about any job, and the rear one (yellow arrow) that also contains the air filters.
Figure 1

With the hood open you can see the two engine covers, the front one (red arrow) that comes off for just about any job, and the rear one (yellow arrow) that also contains the air filters. There are also two air ducts that you will need to remove (green arrows).

To remove the front cover simply grasp it at the front and lift it straight up (red arrow).
Figure 2

To remove the front cover simply grasp it at the front and lift it straight up (red arrow).

This photo illustrates two of the clips of the underside of the cover (red arrows).
Figure 3

This photo illustrates two of the clips of the underside of the cover (red arrows). The metal clips can weaken over time and can easily be replaced just by pulling them off and pushing new ones on.

There are two plastic air ducts, one on each side.
Figure 4

There are two plastic air ducts, one on each side. To remove the ducts compress the plastic duct towards the front of the car (red arrow) and slide it off the rear engine cover. These are just friction fits and do not have fasteners.

With the duct off the engine cover pull it out from the front grille (red arrow) and remove it from the engine bay.
Figure 5

With the duct off the engine cover pull it out from the front grille (red arrow) and remove it from the engine bay. The other duct (yellow arrow) is removed in the same fashion.

Pull the hose from the air pump off the right side of the rear engine cover (red arrow).
Figure 6

Pull the hose from the air pump off the right side of the rear engine cover (red arrow). There is a clip on the very back of the cover that you need to reach in and release (yellow arrow). You can just use your hand to push it back off the cover.

To remove the rear engine cover you will need to move the strut tower cross brace (red arrow).
Figure 7

To remove the rear engine cover you will need to move the strut tower cross brace (red arrow).

Unclip the two clips on the air box on the right rear of the engine bay (red arrows).
Figure 8

Unclip the two clips on the air box on the right rear of the engine bay (red arrows).

With the clips undone pull the box up and out (red arrow).
Figure 9

With the clips undone pull the box up and out (red arrow).

On the right side strut tower you are going to remove one of the nuts and bolts (red arrow) and just loosen the other (yellow arrow).
Figure 10

On the right side strut tower you are going to remove one of the nuts and bolts (red arrow) and just loosen the other (yellow arrow). Use an E14 socket and 16mm wrench for this job.

Use the E14 and 16mm wrench and remove both nuts and bolts from the left side mount (red arrows).
Figure 11

Use the E14 and 16mm wrench and remove both nuts and bolts from the left side mount (red arrows).

You can now lift up the left side of the brace enough to lift the rear cover up off its mounts and out from underneath it (red arrow).
Figure 12

You can now lift up the left side of the brace enough to lift the rear cover up off its mounts and out from underneath it (red arrow).

Slide the rear cover out from under the brace and out of the engine bay (red arrow).
Figure 13

Slide the rear cover out from under the brace and out of the engine bay (red arrow).

With the cover removed you can see the clip that attaches to the rear of the cover (red arrow).
Figure 14

With the cover removed you can see the clip that attaches to the rear of the cover (red arrow). Do not forget to reattach this when reinstalling.

Place the cover upside down on your work bench with a couple of rags under it to protect it from getting scratched.
Figure 15

Place the cover upside down on your work bench with a couple of rags under it to protect it from getting scratched. The two air filters are located one on each side (red arrows). If your rear cover was not fitting securely this is a good time to check the condition of the wire clips or mounts that sit over the rubber mounts on the engine. You can squeeze these in tighter to help firm up their grip. Installation is the reverse of removal.








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