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Air Pump Check Valve Replacement
 
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Pelican Technical Article:

Air Pump Check Valve Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$150 to $300

Talent:

**

Tools:

E8 Torx driver and extension

Applicable Models:

Mercedes-Benz W204 (2008-15)

Parts Required:

Check Valves

Hot Tip:

Use care working on old rubber hoses

Performance Gain:

Pass a smog test

Complementary Modification:

New air pump hoses

If your car is not passing a smog test one of the things that could be wrong are the air pump check valves. This article will show you how to replace the air pump check valves on a Mercedes-Benz W204.

To replace the air pump check valves you will need to remove both engine covers (red and yellow arrows) as well as the air inlet ducts (green arrows).
Figure 1

To replace the air pump check valves you will need to remove both engine covers (red and yellow arrows) as well as the air inlet ducts (green arrows). Please see our article on engine cover removal for additional instructions.

With the engine covers off you can see the two air check valves (red arrows) and the air pump they connect to (yellow arrow).
Figure 2

With the engine covers off you can see the two air check valves (red arrows) and the air pump they connect to (yellow arrow).

Left Check Valve- Gently remove the vacuum hose from the left check valve (red arrow).
Figure 3

Left Check Valve: Gently remove the vacuum hose from the left check valve (red arrow).

Left Check Valve- Disconnect the wiring harness by pulling up on the gray tab and then pressing back on it (red arrow).
Figure 4

Left Check Valve: Disconnect the wiring harness by pulling up on the gray tab and then pressing back on it (red arrow).

Left Check Valve- Use an E8 socket and extension and remove the two bolts (red arrows).
Figure 5

Left Check Valve: Use an E8 socket and extension and remove the two bolts (red arrows).

Left Check Valve- Lift the valve off the mount and separate it from the air pump hose (red arrow).
Figure 6

Left Check Valve: Lift the valve off the mount and separate it from the air pump hose (red arrow).

Left Check Valve- Always make sure to install a new gasket (red arrow) anytime you remove the valve.
Figure 7

Left Check Valve: Always make sure to install a new gasket (red arrow) anytime you remove the valve. Installation is the reverse of removal.

Right Check Valve- Begin by gently removing the vacuum hose from the valve (red arrow).
Figure 8

Right Check Valve: Begin by gently removing the vacuum hose from the valve (red arrow). Then use an E8 socket and extension and remove the three bolts holding the valve to the motor (yellow arrows, under valve).

Right Check Valve- Remove the valve from the motor and separate it from the air pump hose (red arrows).
Figure 9

Right Check Valve: Remove the valve from the motor and separate it from the air pump hose (red arrows).

Right Check Valve- Make sure to replace the gasket for the right check valve seat (red arrow) and ensure that the surface is clean before installation.
Figure 10

Right Check Valve: Make sure to replace the gasket for the right check valve seat (red arrow) and ensure that the surface is clean before installation. Installation is the reverse of removal.

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Comments and Suggestions:
MO Comments: I have a 2010 C300 with 90k miles, which sputters engine shakes and check engine lights blinks when stopped in Drive at a stop light or traffic is stopped It was an intermittent issue but is now occurring more frequently. I was told that I ned a valve job. Do you think your suggestion above would solve the problem?
April 27, 2016
  Followup from the Pelican Staff: Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders. The check engine light fault code will identify the misfiring cylinders. - Nick at Pelican Parts  

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