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Pelican Technical Article:

Air Filter Replacement

Steve Vernon

Time:

30 min

Tab:

$30

Talent:

*

Tools:

Philips head screwdriver, rag

Applicable Models:

Mercedes-Benz W126 (1981-91)

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 air filter in your Mercedes W126. 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. Replacement is a snap and should take only 30 minutes or so.

Begin by opening the hood and locating the airbox on the center of the engine. Along the top edge of the cover are a series of clips that hold it to the lower portion of the airbox. Unlatch the six clips then unscrew the butterfly or wing nut in the center of the lid. With all these removed you simply lift the upper cover off the airbox.

Remove the old filter from the airbox. Pull it out so you don't drop any debris back onto the metering plate and inspect it. Typically, if it's full of dirt and dust, it's time to replace it. It's also a good idea to use a vacuum cleaner to remove any loose debris from the airbox housing.

Place the filter element in the airbox, taking note which way it is placed inside. Most filters will have an arrow printed on the side indicating which way it should be placed in the stream of airflow.

There is also an air pump filter inside the housing. If this is dirt, old or brittle it should be replaced also. To replace the filter you need to pull off the air pump hose from the airbox and then use a Philips head screwdriver to remove the two screws holding it in place. Install the new filter and reattach everything.

This photo illustrates the 6 clips (red arrows) that you need to unsnap as well as the wing nut (green arrow) that needs to be unscrewed.
Figure 1

This photo illustrates the 6 clips (red arrows) that you need to unsnap as well as the wing nut (green arrow) that needs to be unscrewed.

With the lid removed you can replace the filters.
Figure 2

With the lid removed you can replace the filters. The filters are designed to flow one way so make sure you pay attention to the orientation of the filter element (red arrow).

With the air filter removed you can see the air pump filter (red arrow) that is old dirty and brittle along with the debris in the lower part of the air filter housing.
Figure 3

With the air filter removed you can see the air pump filter (red arrow) that is old dirty and brittle along with the debris in the lower part of the air filter housing. Make sure you clean the housing before you put everything back together.

To replace the air pump filter remove the hose from it and using a Philips head screwdriver remove the 2 screws (red arrows), and slide the old filter out and insert a new one.
Figure 4

To replace the air pump filter remove the hose from it and using a Philips head screwdriver remove the 2 screws (red arrows), and slide the old filter out and insert a new one.

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