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Air Filter Housing and Intake Pipe Removal
 
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Pelican Technical Article:

Air Filter Housing and Intake Pipe Removal

Steve Vernon

Time:

1 hour1 hr

Tab:

$0

Talent:

**

Tools:

Flathead, Philips screwdriver, 13mm, 10mm socket

Applicable Models:

Mercedes-Benz W123 (1977-85)

Hot Tip:

Careful working with the hoses

Performance Gain:

More room to work

Complementary Modification:

Change air filter

While the air filter housing and intake pipe have been designed and redesigned over the years this article will show you how to remove the air filter housing and intake pipe on a 1985 W123 300TD. Removing the filter housing and intake tube make a lot of jobs like replacing the EGR valve or alternator much easier. Removing them only takes a few minutes and will save you time in the long run by making access to other components easier.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. 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.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The air filter housing (red arrow) and the intake pipe connected to the bottom of it are located in the right front of the engine compartment.
Figure 1

The air filter housing (red arrow) and the intake pipe connected to the bottom of it are located in the right front of the engine compartment.

Begin by removing the overflow hose from the radiator to the expansion tank.
Figure 2

Begin by removing the overflow hose from the radiator to the expansion tank.

Use a flathead screwdriver and remove the hose clamp and hose from either the radiator or expansion tank.
Figure 3

Use a flathead screwdriver and remove the hose clamp and hose from either the radiator or expansion tank. Use care as the plastic nipples can get very brittle.

Use a 10mm socket and remove the connector from the airbox to the expansion tank (red arrow).
Figure 4

Use a 10mm socket and remove the connector from the airbox to the expansion tank (red arrow).

Separate the hose from the valve cover to top of the air filter housing (red arrow).
Figure 5

Separate the hose from the valve cover to top of the air filter housing (red arrow). It is easier to remove one of the hose connections and leave the hose attached to the top of the lid as the lid connection can be very brittle. Use a 13mm socket and remove the bolt holding the lid on (yellow arrow).

Remove the lid and lift the filter out then compress and separate the air inlet from the fender.
Figure 6

Remove the lid and lift the filter out then compress and separate the air inlet from the fender.

Use a Philips screwdriver and remove the two screws that hold the front air filter housing mount to the front cross member and remove the mount.
Figure 7

Use a Philips screwdriver and remove the two screws that hold the front air filter housing mount to the front cross member and remove the mount.

Lift the air filter housing out disconnecting it from the air intake pipe (red arrow).
Figure 8

Lift the air filter housing out disconnecting it from the air intake pipe (red arrow).

Use a Philips screwdriver and loosen the hose clamp and pull the air intake pipe (yellow arrow) off the turbo inlet (red arrow).
Figure 9

Use a Philips screwdriver and loosen the hose clamp and pull the air intake pipe (yellow arrow) off the turbo inlet (red arrow). Installation is the reverse of removal.

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