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Pelican Technical Article:

Air Filter Replacement

Ken Freund

Time:

15 minutes15 mins

Tab:

$17

Talent:

*

Tools:

10mm wrench or socket & ratchet

Applicable Models:

Mercedes-Benz 450SL (1973-80)

Parts Required:

New air filter

Hot Tip:

Work on a cool engine

Performance Gain:

Proper engine performance

Complementary Modification:

New rubber air filter housing mounts (as needed, if equipped)

Changing the air filter on a Mercedes R107 chassis 450/380/500/560 SL is one of the easiest jobs on the car. Early models have a stamped steel air filter housing with a round pleated-paper filter element, while later models have a stamped aluminum housing with a flexible oval pleated-paper filter. There are also a few minor variations of breather hoses and such attaching to the filter housing. However, the same basic steps apply to servicing:

Take a rag and wipe any dirt, leaves, etc. off the air-cleaner housing (aluminum housing shown).

Remove any hoses attached to the lid.

Remove the wing nut that's located in the center of the air cleaner cover.

Unclip the snap-clips that hold the lid on around the perimeter of the lid. A small wrench or screwdriver can be used to lever them open. Some may be partially obscured by hoses and other items.

Pull the lid straight up and set it aside.

If there are any leaves or other debris that has gotten into the air cleaner housing, place a clean cloth over the engine's throttle body air intake temporarily while you are working. This will keep debris from getting into the engine. It's quite common for rodents to make nests inside air cleaners when vehicles are stored.

Lift the filter element out of the housing. Inspect it for cleanliness and signs of damage, etc.

Wipe any dirt out of the housing with a damp cloth, or if it's really dirty use carb cleaner spray.

If the filter is dirty, replace it.

Reinstall filter and the cover and seat it in place, secure the clips around the perimeter and re-attach any hose (if equipped) that was removed.

Note the date and mileage and enter the filter replacement into the vehicle's service logs.

Housing Removal

If the inside of the filter housing is very dirty, or contaminated with oil from breathers, etc., it may have to be removed for cleaning. It also must be removed for some service procedures.

To remove the filter housing base, remove the nuts holding it down at each side (photos) and lift and wiggle the housing up carefully until the rubber ring around the throttle body releases.

Standing on the right side of the vehicle, tilt the housing front up first and disconnect the breather hose from the right rear corner.

Installation is the reverse of removal.

Take a rag and wipe any dirt, leaves, etc.
Figure 1

Take a rag and wipe any dirt, leaves, etc. off the air-cleaner housing (aluminum housing shown).

Steel housing shown.
Figure 2

Steel housing shown.

Remove any hoses attached to the lid.
Figure 3

Remove any hoses attached to the lid.

Remove the wing nut that's located in the center of the air cleaner cover.
Figure 4

Remove the wing nut that's located in the center of the air cleaner cover.

Unclip the snap-clips that hold the lid on around the perimeter of the lid.
Figure 5

Unclip the snap-clips that hold the lid on around the perimeter of the lid. A small wrench or screwdriver can be used to lever them open. Some may be partially obscured by hoses and other items.

Note conditions in the filter housing.
Figure 6

Note conditions in the filter housing. If there are any leaves or other debris that has gotten into the air cleaner housing, place a clean cloth over the engine's throttle body air intake temporarily while you are working. This will keep debris from getting into the engine. It's quite common for rodents to make nests inside air cleaners when vehicles are stored.

Lift the filter element out of the housing.
Figure 7

Lift the filter element out of the housing. Inspect it for cleanliness and signs of damage, etc. Note the part number on it for future reference.

If necessary, use carb cleaner spray and a rag to clean the inside of the housing.
Figure 8

If necessary, use carb cleaner spray and a rag to clean the inside of the housing.

Install filter element.
Figure 9

Install filter element. Install the lid and seat it in place, secure the clips around the perimeter and re-attach any breather hose (if equipped) that was removed. Housing Removal If the inside of the filter housing is very dirty, or contaminated with oil from breathers, etc., it may have to be removed for cleaning. It also must be removed for some service procedures. To remove the filter housing base, remove the nuts holding it down at each side (photos) and lift and wiggle the housing up carefully until the rubber ring around the throttle body releases. Standing on the right side of the vehicle, tilt the housing front up first and disconnect the breather hose from the right rear corner. Installation is the reverse of removal.

To remove the filter housing base, remove the nuts holding it down at each side.
Figure 10

To remove the filter housing base, remove the nuts holding it down at each side.

Lift and wiggle the housing up carefully until the rubber ring around the throttle body releases.
Figure 11

Lift and wiggle the housing up carefully until the rubber ring around the throttle body releases. Standing on the right side of the vehicle, tilt the housing front up first and disconnect the breather hose from the right rear corner.

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Comments and Suggestions:
padinosaur Comments: I have a 1977 450slc when all controls are in the off position hot air still comes out. Do you have a service manual for this auto?
July 18, 2016
  Followup from the Pelican Staff: We do not have articles for that model. It may be as simple as the heater valve isn't being closed when the heat is off. - Nick at Pelican Parts  

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