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Pelican Technical Article:

Engine Compartment Covers Removal

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$0

Talent:

*

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Engine compartment side covers, engine air filter housing,

Hot Tip:

Be careful not to get securing clips caught between the housing covers

Performance Gain:

Clean air filters improve gas mileage, fuel economy and drivability

Complementary Modification:

Fix vacuum leaks

Starting in the early '90's many European manufacturers started using engine covers in an effort to control under-hood temperatures from deforming the paint on the hood of the car in addition to hood insulating pads. Engine compartment covers also protected wiring and hoses as well mounted on the inner fenders?. These covers also cleaned up the look of the engine compartment. If you need to service components inside the engine compartment then you will need to remove these covers. In this tech article we will go over the steps to remove you engine covers so you have access to make the necessary repairs.

This photo illustrates your engine compartment with the hood open.
Figure 1

This photo illustrates your engine compartment with the hood open. Remove the two are intake tubes by pulling them in the direction of the blue arrow off of the air filter housing. Here the air intake tubes are already removed.

Pull the air intake tube off of its intake mount (green arrow) by pulling each end in the direction of the blue arrows.
Figure 2

Pull the air intake tube off of its intake mount (green arrow) by pulling each end in the direction of the blue arrows. Remove it from the engine compartment. Here the air intake tube is already removed.

Locate the four spring clips (green arrows) that are under the corners of the front cover.
Figure 3

Locate the four spring clips (green arrows) that are under the corners of the front cover.

Figure 4

Remove the front engine cover by lifting it up off of the 4 spring clips that hold it in place by moving them in the direction of the blue arrow

Working at the back of the right side engine cover/air filter housing remove the crankcase breather hose (green arrow) by moving each end in the direction of the blue arrow.
Figure 5

Working at the back of the right side engine cover/air filter housing remove the crankcase breather hose (green arrow) by moving each end in the direction of the blue arrow.

The brake booster vacuum supply line (green arrow) is routed over the left side air intake snorkel on the engine cover/air filter housing.
Figure 6

The brake booster vacuum supply line (green arrow) is routed over the left side air intake snorkel on the engine cover/air filter housing. Carefully move the hose around the air intake snorkel in the direction of the blue arrow.

Lift the front of the engine cover/air filter housing in the direction of the blue arrows until it comes off of the front spring clips.
Figure 7

Lift the front of the engine cover/air filter housing in the direction of the blue arrows until it comes off of the front spring clips.

This is the left side spring clips (green arrow) that you need to lift the engine cover/air filter housing off of to loosen the cover/housing.
Figure 8

This is the left side spring clips (green arrow) that you need to lift the engine cover/air filter housing off of to loosen the cover/housing. There is also one on the right side in approximately the same position.

This photo illustrates the left side by the back of the air filter housing.
Figure 9

This photo illustrates the left side by the back of the air filter housing. While holding up the front of the cover/housing slide it forward in the direction of the blue arrow to remove it from the rubber mounts (green arrow). There is also a mount on the right side in approximately the same position that you have to slide the housing forward to get it off the mount.

Figure 10

Working at the left side lift the engine compartment seal away from the corner

On the driver side remove the two Phillips head screws (green arrows) and lift up on the inner fender cover.
Figure 11

On the driver side remove the two Phillips head screws (green arrows) and lift up on the inner fender cover.

This photo illustrates the right side of the engine compartment.
Figure 12

This photo illustrates the right side of the engine compartment. Lift up the engine compartment seal away from the engine compartment covers.

Working at the right side engine compartment remove the five Phillips head screws (green arrows) and lift up on the cover to expose various control units and relays.
Figure 13

Working at the right side engine compartment remove the five Phillips head screws (green arrows) and lift up on the cover to expose various control units and relays.

Lift up on the right side engine compartment cover to expose wiring and fasters.
Figure 14

Lift up on the right side engine compartment cover to expose wiring and fasters. Installation is the reverse of the removal steps. Lay the left side and right side inner fender covers in place. Slide the two slots of the engine cover/air filter housing in the rubber mounts at the back of the engine compartment. Route the brake booster vacuum supply line over the left side air intake snorkel and push down on the front of the cover/housing until the two front spring clips engage. Push down on the front engine cover until the four spring clips are engaged. Install the crankcase breather hose from the valve cover to the cover/housing. Install the two air intake hoses on each side of the cover/housing to the air intakes on each side of the radiator. Start the engine and make sure the parts are not loose or vibrating excessively.

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