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Pelican Technical Article:

Air Cross Over Pipe Removal

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0

Talent:

*

Tools:

10mm socket, flathead screwdriver

Applicable Models:

Mercedes-Benz W124 (1986-95)

Hot Tip:

Don't drop anything into the open throttle body

Performance Gain:

Work on other projects

Complementary Modification:

Change air filter

The M104 engine has an air pipe that carries the filtered air from the air box to the throttle body. You will need to remove it for most of the jobs that you perform on the top of the motor. It is not hard to do and should take you less than 30 minutes even the first time you attempt it.

The air cross over pipe (red arrow) carries filtered air from the air box past the MAF and down to the throttle body.
Figure 1

The air cross over pipe (red arrow) carries filtered air from the air box past the MAF and down to the throttle body. You will need to remove this pipe for most of the work you will perform on the top of the motor.

Start by disconnecting the MAF sensor.
Figure 2

Start by disconnecting the MAF sensor. The MAF is held in place by two clips to the air filter box (red arrow, one shown, one below) a single clamp to the intake tube (yellow arrow) and the wiring harness (green arrow).

Turn the locking ring on the harness (red arrow) counter clockwise; this will separate it from the connection on the MAF (yellow arrow).
Figure 3

Turn the locking ring on the harness (red arrow) counter clockwise; this will separate it from the connection on the MAF (yellow arrow).

Separate it from the air filter lid by pulling back on the two clips (red arrows).
Figure 4

Separate it from the air filter lid by pulling back on the two clips (red arrows). You can leave the MAF attached to the tube and remove the MAF and tube together.

Remove the two 10mm nuts where the intake tube attaches to the valve cover (red arrows).
Figure 5

Remove the two 10mm nuts where the intake tube attaches to the valve cover (red arrows).

Disconnect the air intake temperature sensor (red arrow).
Figure 6

Disconnect the air intake temperature sensor (red arrow).

There is a single hose clamp that holds the intake tube to the throttle body.
Figure 7

There is a single hose clamp that holds the intake tube to the throttle body. You will need to reach between the water pump and the intake runners with a long flathead screwdriver (red arrow) to loosen the clamp. With the clamp loose remove the intake tube and MAF from the top of the engine. You will want to stuff a rag or cloth into the open throttle body tube to prevent anything from falling into the throttle body. Installation is the reverse of removal.


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Page last updated: Wed 12/7/2016 02:39:37 AM