C3.4B Industrial Engine Caterpillar

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Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.

Note: Refer to Systems Operation, Testing, and Adjusting, "Cleanliness of Fuel System Components" for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.

Remove the Element

1. Turn the fuel supply valve (if equipped) to the OFF position before performing this maintenance.

2. Place a suitable container under the water separator in order to catch any fuel that might spill. Clean up any spilled fuel. Clean the outside body of the filter assembly.

3. Make a temporary Mark (A) across the filter before the assembly is removed.
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   Illustration 1	g03374220
   Typical example

4. Install a suitable tube onto drain (3). Open the drain valve (2). Rotate the drain valve counterclockwise. Two full turns are required. Loosen vent screw (1).

   Note: Two complete rotations of the valve will release the valve from the filter element.

5. Allow the fuel to drain into the container. Remove the tube and install the valve into the filter element. Engage the threads of the valve into the filter element. Do not secure the valve.

6. Tighten the vent screw (1) securely . Remove the wiring harness from connection (4).
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   Illustration 2	g03374223
   Typical example

7. Remove the filter bowl (6). Rotate the filter assembly counterclockwise in order to remove the filter assembly. Refer to your Cat dealer for the correct tool in order to remove the filter assembly.

8. Rotate the filter element counterclockwise and remove the filter element (5). Clean the filter bowl.

Install the Element

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Illustration 3	g03374224
Typical example

1. Locate the thread in the filter element (8) onto the threads (9). Spin on the element. Do not tighten.

2. Lubricate the O ring seal (7) with clean engine oil. Do NOT fill the bowl with fuel before the assembly is installed.

3. Do not use a tool in order to install the filter assembly. Tighten the filter bowl (6) by hand. Install the filter bowl (6) and align with your temporary marks (A).

4. Tighten the valve (2) securely. Remove the container and dispose of the fuel in a safe place.

5. The secondary filter element must be replaced at the same time as the primary filter element. Refer to the Operation and Maintenance Manual , "Fuel System Filter - Replace".