Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

09-037
Freightliner
Service Bulletin

Description of Revisions:This bulletin replaces the version dated
01/01/2016. The bulletin has been changed to include installation
of an air intake seal at the turbocharger inlet for M2 106 vehicles
with ISL engines, and 108SD vehicles with L9 engines. Table 4 is
added to show this seal part number.

General Information
The following recommendations apply to vehicles used in dusty environments:
• For 114SD vehicles equipped with either a 03-38644-000 or 03-38644-001 air cleaner, replace the air
cleaner assembly. See Table 1.
• For certain 114SD vehicles, replace the metal safety screen with a pleated safety element. See Table 2.
• For 108SD, 114SD, M2 106, and M2 112 vehicles with air ducts specified in Table 3, install an additional
seal at the outlet of the air cleaner.
• For M2 106 with ISL engines equipped with air duct 03-37521-000, and 108SD with L9 engines equipped
with air duct 03-37520-000, install an additional seal at the turbocharger inlet. See Table 4.
These modifications will improve the sealing quality of the air cleaner and help prevent dust from entering the
engine. Detailed information is provided below.

Parts
NOTE: Part numbers are listed in PartsPro. See module 190 for air cleaners and module 189 for air
ducts.
Part Number
Description
03-42321-001
Air Cleaner Assembly
NOTE: This air cleaner is for 114SD vehicles that are equipped with either air cleaner
03-38644-000 or 03-38644-001.
Table 1, Air Cleaner (for 114SD vehicles)
Part Number
Description
DN P547520
Pleated Safety Element
NOTE: The pleated safety element is part of air cleaner 03-42321-001 (see Table 1).
Table 2, Pleated Safety Element (for 114SD vehicles)
Part Number
Description
03-35087-002
Air Intake Seal, 6 inch
NOTE: This seal applies to 108SD, 114SD, and M2 106 and 112 vehicles equipped
with one of the following air ducts:

• 03-37483-000

• 03-37521-000

• 03-39069-000

• 03-37486-000

• 03-38645-000

• 03-39070-000

• 03-37520-000
Table 3, Air Intake Seal, 6 inch (108SD, 114SD, and M2 vehicles)

Freightliner Service Bulletin, 09/06/2019

Page 1

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2

09-037
Freightliner
Service Bulletin

FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

Part Number
Description
03-35087-000
Air Intake Seal, 3.5 inch
NOTE: This seal applies to M2 106 with ISL engines equipped with air duct 03-37521000, and 108SD with L9 engines equipped with air duct 03-37520-000.
Table 4, Air Intake Seal, 3.5 inch (for M2 106 vehicles with ISL engines Only)

Air Cleaner Replacement (Qualifying 114SD Vehicles Only)
For 114SD vehicles equipped with either air cleaner 03-38644-000 or 03-38644-001, replace the air cleaner with
a 03-42321-001 unit, as follows.
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Loosen the clamps at the air cleaner assembly and turbocharger, and remove the air intake duct. See Fig.
1.
3. Remove the air cleaner assembly and mounting bracket (together) from the vehicle.
4. Remove the air cleaner assembly from the mounting bracket.
5. Install a new air cleaner assembly on the mounting bracket, and tighten the fasteners 11 to 13 lbf·ft (15 to
18 N·m).
6. Install the air cleaner assembly and mounting bracket together on the vehicle, and tighten the fasteners 11
to 13 lbf·ft (15 to 18 N·m).
7. Wipe clean the inside and outside of the duct, and install it on the vehicle. Tighten the clamp at the
turbocharger 90 lbf·in (1020 N·cm) and the clamp at the air cleaner 40 lbf·in (450 N·cm).

Page 2

Freightliner Service Bulletin, 09/06/2019

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

09-037
Freightliner
Service Bulletin

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

2
3

1

4

5
5

6

11/03/2015

1.
2.
3.
4.
5.
6.

f090519d

Air Cleaner Assembly
Screw
Washer
Mounting Bracket
Clamp
Air Intake Duct
Fig. 1, Air Cleaner Assembly Installation

Safety Element Replacement (114SD Vehicles Only)
For 114SD vehicles, replace the metal safety screen with a pleated safety element (see Table 2), as follows.

NOTE: Vehicles equipped with air cleaner 03-42321-001 do not need to have the safety element
replaced (it is included in air cleaner 03-42321-001).
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Loosen the clamps at the air cleaner assembly and turbocharger, and remove the air intake duct. See Fig.
1.
3. Remove the primary air cleaner element from the air cleaner housing. See Fig. 2.

Freightliner Service Bulletin, 09/06/2019

Page 3

09-037

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2

Freightliner
Service Bulletin

FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

1

2
4
5
5

6

11/03/2015

3

A
f090489a

A. Replace the metal safety screen with a pleated
safety element.
1. Primary Air Cleaner Element
2. Pleated Safety Element
3. Metal Safety Screen
4. Air Cleaner Housing
5. Clamp
6. Air Intake Duct
Fig. 2, Replacing the Metal Screen with a Safety
Element

4. Remove the metal safety screen from the air cleaner housing.
5. Clean the housing surface.
6. Install a new pleated safety element in the air cleaner housing. See Table 2 and Fig. 2.

NOTE: The pleated safety element should be changed each time the primary filter element is
changed. See the vehicle workshop manual for instructions.
7. Install the filter element and tighten the capscrews 25 to 35 lbf·in (285 to 395 N·cm).

Air Intake Seal Installation (108SD, 114SD, and M2 106 and 112
Vehicles)
For 108SD, 114SD, and M2 106 and 112 vehicles equipped with one of the air ducts listed in Table 3, install
seal 03-35087-002 at the air cleaner outlet.

Page 4

Freightliner Service Bulletin, 09/06/2019

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

09-037
Freightliner
Service Bulletin

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

For M2 106 with ISL engines equipped with air duct 03-37521-000, and 108SD with L9 engines equipped with
air duct 03-37520-000, install seal 03-35087-000 at the turbocharger inlet.
1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires.
2. Loosen the clamps at the air cleaner assembly and turbocharger, and remove the air intake duct. See
Fig.1.
3. Install seal 03-35087-002 on the air cleaner outlet as shown in Fig. 3.

1
2

10/13/2015

1. Air Cleaner Assembly

f090521

2. Seal

Fig. 3, Assembly, Air Intake Seal and Housing

4. For M2 106 with ISL engines, and 108SD with L9 engines, install seal 03-35087-000 on the turbocharger
inlet. See Fig. 4.

Freightliner Service Bulletin, 09/06/2019

Page 5

09-037
Freightliner
Service Bulletin

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

1

Century Class Conventional
Argosy
Cargo
Columbia

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

2

4

3

07/31/2019

1. Clamp
2. Air Intake Seal, 3.5
inch

f090540

3. Turbocharger
4. Air Duct

Fig. 4, Installation, Air Intake Seal and Turbocharger
(for M2 106 with ISL Engines only)

5. Apply P-80® Emulsion (or an equivalent lubricant) to the seals, the base of the air cleaner housing (See
Fig. 5) and the turbocharger inlet (See Fig. 4).

Page 6

Freightliner Service Bulletin, 09/06/2019

Air Cleaner Modifications for Dusty Environments, 108SD/
114SD and Business Class M2
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional

Century Class Conventional
Argosy
Cargo
Columbia

09-037
Freightliner
Service Bulletin

122SD and Coronado
> Business Class M2
Cascadia
> 108SD/114SD

1
2

3

4

10/13/2015

1. Air Cleaner Housing
2. Air Intake Seal, 6
inch

f090520

3. Air Duct
4. Clamp

Fig. 5, Installation, Air Intake Seal and Housing

6. Wipe clean the inside and outside of the duct, and install it. Tighten the clamp at the turbocharger 90 lbf·in
(1020 N·cm) and the clamp at the air cleaner 40 lbf·in (450 N·cm).

Warranty
This bulletin is informational only. Warranty does not apply.

Freightliner Service Bulletin, 09/06/2019

Page 7