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Cam Bore Expansion Plugs Replacement
 
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Pelican Technical Article:

Cam Bore Expansion Plugs Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$5 to $15

Talent:

*

Tools:

Trim removal tool or small flathead screwdriver

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

Plugs

Hot Tip:

Use a mirror to see the oil built up

Performance Gain:

No leaks

Complementary Modification:

Replace air filters

The 350 series V6 engines in the Mercedes-Benz cars are known for leaking oil from the rear of the camshaft area. At the rear of these engines are three cam bore expansion plugs that seal up the covers and allow for expansion. These plugs dry out and start leaking over time and need to be replaced. The plugs are cheap. Replacing them takes no time at all yet most shops charge a lot of money for this repair.

Even if you are just starting out on DIY work on your car you can save yourself a lot of money by doing this repair yourself. First check that the plugs are leaking. You can do this by simply taking a clean cloth and wiping the rear of the top valve covers. If there is oil coming from them they need to be replaced.

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work.
Figure 1

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work. Please see our article on engine cover removal for additional assistance.

There are three expansion plugs, two on the rear left side and one on the right.
Figure 2

There are three expansion plugs, two on the rear left side and one on the right. The plugs are two different sizes. If you are only replacing one plug order the right size. There is one large plug on the left side (yellow arrow) and two smaller plugs (red arrow) on each side.

The plug on the right side is located beside the breather hose (red arrow).
Figure 3

The plug on the right side is located beside the breather hose (red arrow).

This photo illustrates the location of the two plugs on the left side (red arrow, larger plug, yellow arrow, smaller plug).
Figure 4

This photo illustrates the location of the two plugs on the left side (red arrow, larger plug, yellow arrow, smaller plug).

Use a trim removal tool and simply pry the plug out from the cover (red arrow).
Figure 5

Use a trim removal tool and simply pry the plug out from the cover (red arrow). If you are using a flathead screwdriver make sure not to mar the metal surface.

With the plug gently pried away from the cover you can remove it the rest of the way by hand (red arrow).
Figure 6

With the plug gently pried away from the cover you can remove it the rest of the way by hand (red arrow).

Perform the same procedure for removing the other plugs (red arrow).
Figure 7

Perform the same procedure for removing the other plugs (red arrow).

If you are ordering the plugs separately make sure you order the right size.
Figure 8

If you are ordering the plugs separately make sure you order the right size. Installation is the reverse of removal.

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Comments and Suggestions:
jerry Comments: thanks for your help
August 1, 2016
  Followup from the Pelican Staff: No problem. - Nick at Pelican Parts  

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