C6.6 Industrial Engine Caterpillar

Removal Procedure

1. Turn the battery disconnect switch to the OFF position.

2. Turn the fuel supply to the OFF position.
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   Illustration 1	g02240074

3. Make temporary identification marks on the plastic tube assemblies in order to show the correct position of the plastic tube assemblies.

4. Place a suitable container below the fuel filter base in order to catch any fuel that might be spilled.

5. Disconnect plastic tube assembly (2), plastic tube assembly (4), and plastic tube assembly (5) from the assembly of primary fuel filter (3).

6. Use Tooling (A) in order to plug the plastic tube assemblies with new plugs. Use Tooling (A) in order to cap the ports in the primary fuel filter with new caps.

7. Disconnect the Original Equipment Manufacturers (OEM) harness assembly from the connection on harness assembly (6) for water in fuel switch (7).

8. Remove bolts (1) and remove the assembly of primary fuel filter (3) from the mounting bracket.
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   Illustration 2	g02524478

9. If necessary, follow Step 9.a through Step 9.e in order to disassembly the assembly of primary fuel filter (3).

   1. Remove connection (8) and remove O-ring seal (9) (not shown).

   2. Remove connection (12) and remove O-ring seal (10) (not shown).

   3. Remove connection (13) and remove O-ring seal (11) (not shown).

   4. Remove water in fuel switch (7) and remove O-ring seal (15) (not shown).

   5. Remove the filter element from fuel filter canister (14). Refer to Operation and Maintenance Manual, "Fuel System Primary Filter (Water Separator) Element - Replace" for the correct procedure.

Installation Procedure

1. Ensure that the fuel filter base is clean and free from damage. If necessary, replace the complete fuel filter base and filter assembly.
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   Illustration 3	g02524478

2. If necessary, follow Step 2.a through Step 2.e in order to assembly primary fuel filter (3).

   1. Install a new O-ring seal (9) (not shown) to connection (8). Install connection (8) to primary fuel filter (3). Tighten the connection to a torque of 20 N·m (177 lb in).

   2. Install a new O-ring seal (10) (not shown) to connection (12). Install connection (12) to primary fuel filter (3). Tighten the connection to a torque of 20 N·m (177 lb in).

   3. Install a new O-ring seal (11) (not shown) to connection (13). Install connection (13) to primary fuel filter (3). Tighten the connection to a torque of 20 N·m (177 lb in).

   4. Install a new O-ring seal (15) (not shown) to water in fuel switch (7). Install water in fuel switch (7) to canister fuel filter (14). Tighten water in fuel sensor (7) securely.

   5. Install a new filter element to fuel filter canister (14). Refer to Operation and Maintenance Manual, "Fuel System Primary Filter (Water Separator) Element - Replace".
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   Illustration 4	g02240074

3. Position the assembly of primary fuel filter (3) onto the mounting bracket.

4. Install bolts (1) to the assembly of primary fuel filter (3). Tighten the bolts to a torque of 44 N·m (32 lb ft).

5. Remove the plugs from the plastic tube assemblies. Remove the caps from the ports in the fuel filter base.
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   NOTICE
   Ensure that the plastic tube assemblies are installed in the original positions. Failure to connect the plastic tube assemblies to the correct ports will allow contamination to enter the fuel system. Serious damage to the engine will result if contaminated fuel enters the fuel system.

6. Connect plastic tube assembly (2), plastic tube assembly (4), and plastic tube assembly (5) to primary fuel filter (3).

7. Connect the OEM harness assembly to the connection on harness assembly (6) for water in fuel sensor (7).

8. Turn the fuel supply to the ON position.

9. Turn the battery disconnect switch to the ON position.

End By:

1. Remove the air from the fuel system. Refer to Operation and Maintenance Manual, "Fuel System - Prime".