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Pelican Technical Article:

Air Filter Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$12 to $60

Talent:

*

Tools:

10mm wrench

Applicable Models:

Mercedes-Benz 300CE (1990-93)
Mercedes-Benz 300E (1990-93)
Mercedes-Benz 300TE (1990-93)

Parts Required:

New air filter

Hot Tip:

Wipe down the inside of the airbox

Performance Gain:

If the old filter is really dirty, you'll pick up some power

Complementary Modification:

Change cabin air filter

Every 10,000 miles or so, you should change the engine air filter in your Mercedes-Benz W124. You should do this sooner if you live in a dry and dusty area or do a lot of driving on dirt roads. The air filter protects the air intake system, valves, pistons, cylinder walls, and engine oil from dust and debris that can be sucked in under normal operation.

Begin by opening the hood and having a look at the engine.
Figure 1

Begin by opening the hood and having a look at the engine. The air filter is located on the right side of the engine bay (red arrow). Don't forget that all directions are given as if you are sitting in the car.

There are two clips that hold the air box lid to the intake and MAF (red arrow, one shown, one below) and four clips that hold the lid to the air box (yellow arrows).
Figure 2

There are two clips that hold the air box lid to the intake and MAF (red arrow, one shown, one below) and four clips that hold the lid to the air box (yellow arrows).

Release the two clips on the intake tube by pulling them back towards the lid (red arrows).
Figure 3

Release the two clips on the intake tube by pulling them back towards the lid (red arrows).

The four clips holding the lid to the box release by lifting up on the plastic tabs (red arrows).
Figure 4

The four clips holding the lid to the box release by lifting up on the plastic tabs (red arrows).

Lift the lid up and away from the intake tube (red arrow).
Figure 5

Lift the lid up and away from the intake tube (red arrow).

Pull the filter back and out of the air box (red arrow).
Figure 6

Pull the filter back and out of the air box (red arrow). Depending on how long it has been since your last air filter change, the air box may have substantial debris in it (yellow arrow). I recommend removing the air box and giving it a good cleaning; this will also allow you to check for windshield and coolant reservoir leaks.

To remove the air box, remove the 10mm nut and bracket by the windshield washer reservoir (red arrow).
Figure 7

To remove the air box, remove the 10mm nut and bracket by the windshield washer reservoir (red arrow).

At the front of the box remove the circlip (red arrow) and the overflow hose from the lid (yellow arrow) attached to the cross member.
Figure 8

At the front of the box remove the circlip (red arrow) and the overflow hose from the lid (yellow arrow) attached to the cross member.

Pull the lid up and out (red arrow).
Figure 9

Pull the lid up and out (red arrow). This will free up the snorkel on the air box so you can remove it (yellow arrow).

Pull the box straight up and off the two rubber mounts in the chassis (red arrows).
Figure 10

Pull the box straight up and off the two rubber mounts in the chassis (red arrows).

With the air box removed you can check for leaks from the windshield reservoir (red arrow) and the coolant reservoir (green arrow).
Figure 11

With the air box removed you can check for leaks from the windshield reservoir (red arrow) and the coolant reservoir (green arrow). Look for discolored stains on the metal. Installation is the reverse of removal.






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