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    
 >  >
Oil Housing and Seal Replacement
 
Bookmark and Share

Pelican Technical Article:

Oil Housing and Seal Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$10 to $190

Talent:

**

Tools:

E12, E10 E Torx sockets, 17mm socket

Applicable Models:

Mercedes-Benz W204 (2008-15)

Parts Required:

Oil housing seal, thermostat seal, coolant, oil

Hot Tip:

Clean both surfaces well

Performance Gain:

No leaks

Complementary Modification:

Oil and filter change

The oil filter housing has a tendency to start leaking oil and/or coolant over the years. This is usually caused by the seal drying out and failing. Installing a new seal usually solves the problem. While this is not a big job in itself you do need to remove several components to get the housing out.

This is a great time to change your oil and filter. You are going to need to drain the oil to remove the oil filter housing so you might as well change everything while you are at it!

You will also need to drain the coolant from the radiator as the coolant flows through the cooler and needs to be removed before you can replace the seal. Please see our article on coolant drain and flush.

Begin by removing the front engine cover (red arrow) by pulling it straight up and off and the left side air duct (yellow arrow) by compressing it in and off the air filter cover.
Figure 1

Begin by removing the front engine cover (red arrow) by pulling it straight up and off and the left side air duct (yellow arrow) by compressing it in and off the air filter cover. Please see our article on engine cover removal for additional assistance.

Drain the coolant from the radiator.
Figure 2

Drain the coolant from the radiator. If your coolant is still good save it to a clean container and reuse it, if not now is also a good time to flush your system. Please see our article on coolant drain and flush for additional assistance.

You will need to remove the Poly-V or drive belt (red arrow).
Figure 3

You will need to remove the Poly-V or drive belt (red arrow). Use a 17mm socket and turn the tensioner counter clockwise until you can slip the belt off of it (red arrow). Do not get your fingers pinched between them.

This photo illustrates the path of the belt; you can see where it passes the alternator (red arrow), power steering pump (green arrow) and A/C compressor.
Figure 4

This photo illustrates the path of the belt; you can see where it passes the alternator (red arrow), power steering pump (green arrow) and A/C compressor. Use this illustration when installing the new belt.

Next remove the thermostat to give you access to the oil housing bolts.
Figure 5

Next remove the thermostat to give you access to the oil housing bolts. Make sure to order a new thermostat gasket before you start. Please see our article on thermostat replacement for additional information.

You are going to be working with E-Torx bolts.
Figure 6

You are going to be working with E-Torx bolts. Make sure you have the right sockets and E-Torx sockets and do not try and remove the hardware with something else.

Lock the tensioner in position by turning it all the way counter clockwise and inserting a small Allen into the locking port to hold it open (red arrow).
Figure 7

Lock the tensioner in position by turning it all the way counter clockwise and inserting a small Allen into the locking port to hold it open (red arrow).

With the tensioner locked in the open position you can get access to the two E12 bolts (red arrows) that hold the tensioner in place.
Figure 8

With the tensioner locked in the open position you can get access to the two E12 bolts (red arrows) that hold the tensioner in place. Use an E12 socket and remove the bolts and tensioner.

Use an E10 Torx socket and remove the single bolt and idler pulley below the thermostat (red arrow).
Figure 9

Use an E10 Torx socket and remove the single bolt and idler pulley below the thermostat (red arrow).

The oil filter housing (red arrow) has the oil cooler attached to it (yellow arrow) and runs both the oil and coolant through the housing to get to the cooler.
Figure 10

The oil filter housing (red arrow) has the oil cooler attached to it (yellow arrow) and runs both the oil and coolant through the housing to get to the cooler. Unlike just replacing the cooler you can remove the housing without removing the power steering reservoir (green arrow).

Use a T12 Torx and remove the five bolts holding the housing to the engine (red arrows).
Figure 11

Use a T12 Torx and remove the five bolts holding the housing to the engine (red arrows).

The bolts are different lengths so make a diagram or other way to keep track of them as you remove them.
Figure 12

The bolts are different lengths so make a diagram or other way to keep track of them as you remove them.

With all of the bolts off you should be able to wiggle and pull the housing from the block.
Figure 13

With all of the bolts off you should be able to wiggle and pull the housing from the block. If yours seems really stuck make sure you have removed all of the bolts and try gently prying it off without placing anything between the mounting surfaces of the housing or engine.

Pull the old gasket from the housing.
Figure 14

Pull the old gasket from the housing. You may need to use a pick or small flathead screwdriver to get it out but use care not to scratch or gouge the surface (red arrow). Scotch-Brite pads are a good idea to use here.

In this photo you can see the channels for the oil (red arrows) and the channels for the coolant (yellow arrows).
Figure 15

In this photo you can see the channels for the oil (red arrows) and the channels for the coolant (yellow arrows). Make sure the block is clean and free of any old gasket material. Install the new gasket and torque to spec. Installation is the reverse of removal. Do not forget to refill your coolant and oil.

Bookmark and Share

  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 02:54:01 AM