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Breather Hose and Cover Replacement
 
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Pelican Technical Article:

Breather Hose and Cover Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$20 to $80

Talent:

**

Tools:

E10 Torx

Applicable Models:

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

Parts Required:

Cover or hose

Hot Tip:

Use a mirror to see the oil built up

Performance Gain:

Smoother running car

Complementary Modification:

Replace air filters

There is a breather hose on the top rear of the right valve cover. This hose can fail over time as well as the cover can begin to leak. If your cover is leaking or the hose has failed and is causing a vacuum leak this article will show you how to replace them. Leaking oil from the gasket on the cover can make a mess as well as cause a small vacuum issue; unfortunately at the time of writing this article you could not buy just a new gasket for the cover so if yours is leaking you will need to replace the whole cover.

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.

The breather hose from the right side valve cover (green arrow) attaches to the elbow bellow the MAF sensor.
Figure 2

The breather hose from the right side valve cover (green arrow) attaches to the elbow bellow the MAF sensor. It is much easier to replace the hose out of the engine compartment so you next need to remove the MAF (red arrow) and vacuum line (yellow arrow). Please see our article on MAF sensor replacement for additional information.

Disconnect the breather hose from the rear of the right cylinder head (red arrow).
Figure 3

Disconnect the breather hose from the rear of the right cylinder head (red arrow).

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose.
Figure 4

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose. With the elbow removed you can easily replace the hose.

With the hose disconnected you need to remove the four E10 Torx bolts from the cover (red arrow).
Figure 5

With the hose disconnected you need to remove the four E10 Torx bolts from the cover (red arrow). There is very little room to work on so take your time and make sure you do not drop any hardware while removing it.

With the four bolts removed you can wiggle the cover off the rear of the valve cover and replace it (red arrow).
Figure 6

With the four bolts removed you can wiggle the cover off the rear of the valve cover and replace it (red arrow).

The gasket or seal (red arrow) is usually where the cover leaks.
Figure 7

The gasket or seal (red arrow) is usually where the cover leaks. Unfortunately at the time of writing this article there was not a separate replacement gasket available. You will need to replace the whole cover. Check before ordering for an update on the status of just the gasket. Installation is the reverse of removal.

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Page last updated: Tue 6/27/2017 03:03:07 AM