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Replacing the Air Pump Belt on your Mercedes-Benz
 
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Pelican Technical Article:

Replacing the Air Pump Belt on your Mercedes-Benz

Steve Vernon

Time:

1 hour1 hr

Tab:

$5

Talent:

*

Tools:

6mm Allen, 13mm, 19mm wrench

Applicable Models:

Mercedes-Benz W126 (1981-91)

Parts Required:

New belt

Hot Tip:

Be careful working around your radiator

Performance Gain:

Pass a smog test

Complementary Modification:

New purge valve

The Mercedes-Benz W126 has the proud distinction of having 5 different drive belts. This article will show you how to replace the Air Pump belt.

The nice thing about the air pump belt is that it is the only belt that you can change without removing anything else. The bad thing is that it has to come off to change any of the other belts.

The air pump is located on the lower passenger side of the engine.

To replace the belt you will need to loosen the pump itself. Use a 6mm Allen wrench and loosen the Allen bolt at the top of the pump. The pump has a tensioner/locking bolt on its lower housing. There are two nuts on the same bolt. Loosen the outer 13mm nut and then turn the inner 19mm nut.

The 19mm has a spiral-toothed ring on it that is used to tension the belt. Turn it counter-clockwise to loosen the belt and when reinstalling, turn it clockwise to tension the belt and while holding the tension tighten down the 13mm bolt.

Don't forget to retighten the 6mm Allen bolt when you are done.

This photo illustrates the five different belts on the W126 (there are two belts on the water pump, power steering pump).
Figure 1

This photo illustrates the five different belts on the W126 (there are two belts on the water pump, power steering pump). The red arrow shows the air pump belt and the green arrow illustrates where the 6mm Allen bolt is located. Note: most of the front of the car has been removed for demonstration purposes.

This is what the pump looks like from under the car.
Figure 2

This is what the pump looks like from under the car. Loosen the 6mm Allen (green arrow) and then loosen the 13mm bolt (red arrow). With the bolt loosened you can turn the 19mm bolt (yellow arrow) and either un-tension or re-tension the belt.

Here you can see how the 19mm bolt has teeth in it (red arrow) and the toothed gate (green arrow) that the bolt turns in.
Figure 3

Here you can see how the 19mm bolt has teeth in it (red arrow) and the toothed gate (green arrow) that the bolt turns in.

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Comments and Suggestions:
josephpinkney Comments: I order a 6mm allen for the air pump, but its to large.
September 30, 2016
  Followup from the Pelican Staff: Try a 5mm. - Nick at Pelican Parts  

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Page last updated: Wed 12/7/2016 02:27:45 AM