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Cylinder Head Front Cover Replacement
 
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Pelican Technical Article:

Cylinder Head Front Cover Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$20 to $900

Talent:

***

Tools:

E10, T27, T30 Torx

Applicable Models:

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

Parts Required:

Sealant

Hot Tip:

Clean the surfaces really well

Performance Gain:

No oil leaks

Complementary Modification:

Reseal valve covers

There are two sections to the valve covers on the Mercedes C350, the front cover (which covers the ends of the variable cams) and the top valve cover. Neither of these covers use a gasket to seal the area between the head or towers. If they start leaking it is usually from some form of damage or warping. If your front cover is leaking the best thing to do is remove it, give it a good cleaning, reseal it, and then reinstall and properly torque the cover.

To replace or remove, clean and reinstall the front cylinder head covers you need to remove the front engine cover (red arrow) by grabbing it with your hand and lifting up and off the engine.
Figure 1

To replace or remove, clean and reinstall the front cylinder head covers you need to remove the front engine cover (red arrow) by grabbing it with your hand and lifting up and off the engine. Remove the two air ducts by compressing them off the rear engine cover and then pull them off the front ducts (yellow arrows). If you need more help please see our article on engine cover removal.

On the left side cover you will need to remove both the oil filter housing (red arrow) as well as the power steering reservoir (yellow arrow).
Figure 2

On the left side cover you will need to remove both the oil filter housing (red arrow) as well as the power steering reservoir (yellow arrow). Please see our articles on these procedures for additional instruction.

With the housing and reservoir removed you will have access to the lower three bolts on the cover (red arrows).
Figure 3

With the housing and reservoir removed you will have access to the lower three bolts on the cover (red arrows).

On the right side cover begin by removing the air switch over valve (red arrow) off its mount.
Figure 4

On the right side cover begin by removing the air switch over valve (red arrow) off its mount. Disconnect the wiring harness and let it hang off to the side.

Use a T27 Torx and remove the three bolts for the switch over valve mount (red arrows), and remove the mount.
Figure 5

Use a T27 Torx and remove the three bolts for the switch over valve mount (red arrows), and remove the mount.

Remove the hoses from the check valves and use a T30 Torx and remove the three bolts holding the air pump in place (red arrows).
Figure 6

Remove the hoses from the check valves and use a T30 Torx and remove the three bolts holding the air pump in place (red arrows).

Disconnect the wiring from the cam sensors and adjusters and set them aside.
Figure 7

Disconnect the wiring from the cam sensors and adjusters and set them aside. Use a T30 Torx and remove the wiring harness mount on the outside of the cover (red arrow).

At this point both covers are the same.
Figure 8

At this point both covers are the same. Use an E10 Torx and remove the seven bolts holding the cover in place (red arrows).

There are two places that you can use to gently pry apart the cover from the head and valve cover (red arrows).
Figure 9

There are two places that you can use to gently pry apart the cover from the head and valve cover (red arrows). Only use this area and NEVER pry anything between the mounting surfaces. There is a sealant between the cover so it can take a little force to separate them.

Once the sealant gives up its purchase make sure to have a hand on the cover.
Figure 10

Once the sealant gives up its purchase make sure to have a hand on the cover. You do NOT want to drop or damage these, as they are very expensive to replace.

Carefully clean the mounting surface of the cover.
Figure 11

Carefully clean the mounting surface of the cover. Do NOT use anything metal on the surface or anything that could scratch or gouge the metal. The mounting surface needs to be extremely clean for a proper seal.

Carefully clean the mounting surface of both the tower and valve cover using care around the area where the valve cover meets the tower (red arrows).
Figure 12

Carefully clean the mounting surface of both the tower and valve cover using care around the area where the valve cover meets the tower (red arrows). Do NOT use anything metal on the surface or anything that could scratch or gouge the metal. The mounting surface needs to be extremely clean for a proper seal.

I recommend Drei Bond 1209.
Figure 13

I recommend Drei Bond 1209. I have used this for years with great results, and it is available at Pelican Parts. Make sure to carefully follow the instructions on the sealant you choose to use and allow it to dry and seal completely. Also you do not need to use a lot of sealant. The extra sealant will squeeze out and make a mess outside the cover and get into the cam and gears on the inside. Installation is the reverse of removal.


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