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Pelican Technical Article:

Air Filter Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$17 to $25

Talent:

*

Tools:

Flathead screwdriver, rags

Applicable Models:

Porsche 944 (1983-89)
Porsche 944 S2 (1989-91)
Porsche 944 Turbo (1986-89)
Porsche 944S (1987-88)

Parts Required:

New air filter

Hot Tip:

Wipe down the inside of the airbox

Performance Gain:

If the old filter is really dirty, you'll pick up some power

Complementary Modification:

Change cabin air filter

Every 10,000 miles or so, you should change the engine air filter in your Porsche 944 Turbo. The air filter protects the air intake system, valves, pistons, cylinder walls, and engine oil from dust and debris that can be sucked in under normal operation. The Turbo or 951 has a different air box system than the normally aspirated car, but the filter can still be changed out in under and hour even the first time you do it. If the car is new to you, you may find that there is a different assortment of hardware holding the air box together and that some or all of the fasteners are broken or missing. These air boxes get very brittle over time and are a common replacement as the car ages. If you find you would like to replace the entire air box, please see our article on air box replacement.

Begin by opening the hood.
Figure 1

Begin by opening the hood. The air filter is located in front of the engine (red arrow) with a cold air intake running to the left front fender area (yellow arrow).

Remove the two flathead screws connecting the air box to intake tube (red arrows).
Figure 2

Remove the two flathead screws connecting the air box to intake tube (red arrows).

You don't really need to remove the tube, but since you are changing the filter, now is a good time to pull it out from the grommet it sits in and check it for dirt and debris (red arrow).
Figure 3

You don't really need to remove the tube, but since you are changing the filter, now is a good time to pull it out from the grommet it sits in and check it for dirt and debris (red arrow). There is no point putting a new filter in if the air intake tube is all plugged up with dirt.

There is a metal clamp that wraps from the top of the air box over the turbo air pipe and connects to the bottom of the air box lid.
Figure 4

There is a metal clamp that wraps from the top of the air box over the turbo air pipe and connects to the bottom of the air box lid. If you are not going to remove the lid, you can just reach under the pipe and unclip the clamp. If you are going to remove the lid from the vehicle, undo the 10mm bolt on the top (red arrow).

Remove the three fasteners securing the air box lid to the base (red arrows).
Figure 5

Remove the three fasteners securing the air box lid to the base (red arrows).

If you are removing the lid completely, it is easier to disconnect the line running to the turbo pipe with a 17mm wrench.
Figure 6

If you are removing the lid completely, it is easier to disconnect the line running to the turbo pipe with a 17mm wrench. Note that there are two washers (red arrows) that need to be replaced if you remove the line.

If you are not removing the lid you can now simply lift it up and turn it upside down to remove the old filter and insert a new one (red arrow).
Figure 7

If you are not removing the lid you can now simply lift it up and turn it upside down to remove the old filter and insert a new one (red arrow).

Don't forget to clean the bottom of the air box (red arrow) before re-installing the lid and new filter.
Figure 8

Don't forget to clean the bottom of the air box (red arrow) before re-installing the lid and new filter. Installation is the reverse of removal.






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