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Pelican Technical Article:

Air Filter Replacement

Frank Hernandez

Time:

5-10 minutes

Tab:

$50

Talent:

*

Tools:

13mm wrench, lint-free cloth

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

New Air Filter (#617-094-01-04-M55)

Hot Tip:

Wipe the inside of the air box clean

Performance Gain:

Restored performance and gas mileage

Complementary Modification:

None

Keeping your air filter clean is an important step in the overall maintenance of your car. Making sure only clean air reaches your engine is performed by the air filter, but over time dirt and debris gets trapped in the filter material, blocking air flow and robbing your car's performance and fuel economy. Though the 300TD air cleaner configuration varies slightly depending on year and if it's a federal or California emissions model, replacing your old filter with a new one is a similar process. Mercedes Benz recommends a 30K mile change interval but depending on where the car lives and driving conditions, a one-year or 10K-15K mile interval may be more appropriate for your car.

Locate your air cleaner at the front left of the engine bay.
Figure 1

Locate your air cleaner at the front left of the engine bay.

Using a 13mm wrench, remove the top nut securing the air cleaner lid.
Figure 2

Using a 13mm wrench, remove the top nut securing the air cleaner lid.

Move the coolant overflow tank hose aside to the right and remove the old air filter.
Figure 3

Move the coolant overflow tank hose aside to the right and remove the old air filter.

Inspect old filter for damage or defects.
Figure 4

Inspect old filter for damage or defects. Things like excessive oil on the filter material can be signs of other issues in the engine. Other than being full of debris, this filter has done its duty and earned a well-deserved retirement.  

It is good practice to clean any area prior to installing new parts.
Figure 5

It is good practice to clean any area prior to installing new parts. Here debris that wasn't captured by the air filter has settled on the bottom of our air cleaner.

Use a lint free cloth to clean and remove any debris or oil that may have entered the air cleaner.
Figure 6

Use a lint free cloth to clean and remove any debris or oil that may have entered the air cleaner.

A clean air cleaner will increase the life and performance of your filters between maintenance intervals.
Figure 7

A clean air cleaner will increase the life and performance of your filters between maintenance intervals.

Also remember to clean the bottom of the air cleaner and inside of the air-cleaner lid, especially around the breather hose outlet, as small amounts of oil will enter the air-box from here.
Figure 8

Also remember to clean the bottom of the air cleaner and inside of the air-cleaner lid, especially around the breather hose outlet, as small amounts of oil will enter the air-box from here.

With the air box clean, insert the new filter and reattach the air box lid.
Figure 9

With the air box clean, insert the new filter and reattach the air box lid. Reassembly is the reverse of removal.


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Comments and Suggestions:
Misterniceguy Comments: When I turn the nut securing the lid, the thread turns as well. Hence, nothing comes off. The assembly does not loosen either. What can I do?
April 30, 2017
  Followup from the Pelican Staff: You'll have to drill it out and replace the part that is stripped.- Nick at Pelican Parts  

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Page last updated: Fri 6/23/2017 02:57:30 AM