Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Valve Cover Gasket Replacement
 
Bookmark and Share

Pelican Technical Article:

Valve Cover Gasket Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$5 to $25

Talent:

**

Tools:

13mm socket, flathead screwdriver, rags, cleaner

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Valve cover gasket

Hot Tip:

Clean everything well

Performance Gain:

Stop oil leaks from the valve cover

Complementary Modification:

EGR valve

Valve covers are traditionally a good source of oil leaks. Changing out the valve cover gasket itself is not that difficult; however depending on which type of engine you have, moving all of the throttle linkage can be a little intimidating. This article is going to show you how to remove the linkage on a 300TD but there really is no magic system or procedure. Just take your time and be sure to take lots of pictures as you go along--it will make it much easier to put it all back together. It also helps to spray each of the ball cups with a little lube before you start, it will make separating the linkage easier.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please include your vehicle information.

While there really is no wrong way to remove all the linkages from the top of your valve cover, try to keep it as simple as possible and take lots of pictures of whatever you remove.
Figure 1

While there really is no wrong way to remove all the linkages from the top of your valve cover, try to keep it as simple as possible and take lots of pictures of whatever you remove.

Use a flathead screwdriver and remove the breather hose on the top of the valve cover (red arrow).
Figure 2

Use a flathead screwdriver and remove the breather hose on the top of the valve cover (red arrow).

Take a few minutes to study the linkage on your valve cover and try and figure out a way to move the least amount of things.
Figure 3

Take a few minutes to study the linkage on your valve cover and try and figure out a way to move the least amount of things. On the 300TD it is easier to remove the four bolts and two plates on the top and leave all the linkages attached than to remove all the linkages.

Disconnect the ball cup (yellow arrow) for the kick down cable and squeeze together the plastic ends on the pass through and remove it from the bracket (red arrow).
Figure 4

Disconnect the ball cup (yellow arrow) for the kick down cable and squeeze together the plastic ends on the pass through and remove it from the bracket (red arrow).

I like to remove the circlip (red arrow) from the bracket on the side mount and push the connecting rod out, leaving the empty bracket attached to the valve cover.
Figure 5

I like to remove the circlip (red arrow) from the bracket on the side mount and push the connecting rod out, leaving the empty bracket attached to the valve cover.

Remove the four 13mm bolts (red arrows) from the top of the cover and move the two plates and linkage off to the left side of the motor.
Figure 6

Remove the four 13mm bolts (red arrows) from the top of the cover and move the two plates and linkage off to the left side of the motor.

With the linkage off to the side you can remove the four 13mm bolts holding the valve cover to the head (red arrows).
Figure 7

With the linkage off to the side you can remove the four 13mm bolts holding the valve cover to the head (red arrows).

Lift the valve cover off the head taking care to safely clear all the lines and linkage.
Figure 8

Lift the valve cover off the head taking care to safely clear all the lines and linkage.

Remove the old gasket from the cover.
Figure 9

Remove the old gasket from the cover. Clean and inspect the cover for any cracks or damage.

The area between the intake manifold and valve cover on the turbos can collect a huge amount of grease, dirt and debris.
Figure 10

The area between the intake manifold and valve cover on the turbos can collect a huge amount of grease, dirt and debris. Make sure you do not let this get into the valve train! Carefully clean the mounting area on the head. Installation is the reverse of removal.

Bookmark and Share
Comments and Suggestions:
charmalu Comments: Not a question, just a comment.
pressure wash the engine at a car wash first before removing the VC.

I hold a magnet close to the circlip before removing it. Never know where it will go, or if you drop it, its gone forever.

I wash the VC in a pan of gas inside and out. Then blow it off with a can of Carb Cleaner and let air dry. Then do the valves.

I always wipe off the head surface where the gasket sets.
Use some rags with gas, then finish up with Carb Cleaner on a rag to get it squeaky clean.
I usually have no oil leaks.

There is a thread running in Diesel discussion about how crappy Victor Reinz VC Gaskets are.

I use them and so far no problems. I have 388K miles on the 80 240D, and will reuse the gasket several times w/o any problems. I may get a small seep of oil, but nothing that runs down the side of the engine.
April 5, 2016
  Followup from the Pelican Staff: I prefer not to power wash engine, too much risk for water intrusion.

Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Fri 12/9/2016 03:00:28 AM