New Secondary Fuel Filter{1250, 1251, 1261, 1262} Caterpillar

Engine:

C6.6 (S/N: 666382-382,473-473,486-487,617-618,620-620,623-624,628-628,824-824,1398-1398,1686-1686,1693-1694,2103-2107,2165-2165,2367-2367,3031-3033,3046-3047,3330-3336,3338-3339,3379-3382,4220-4220,4483-4483,4748-4748,4820-4820,4823-4823,4825-4825,4827-4828)

Introduction

There have been isolated instances of issues with accelerated wear on the electronic unit injectors. This Special Instruction, "New Secondary Fuel Filter" will prevent the issue.

Refer to Special Instruction, KENR6938, "High Leakoff of the Electronic Unit Injector" in order to determine the condition of the electronic unit injectors. After the Special Instruction, KENR6938, "High Leakoff of the Electronic Unit Injector" has been completed, carry out this Special Instruction, "New Secondary Fuel Filter".

Required Parts

Removal Procedure

1. Remove the primary fuel filter. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install" for the correct procedure.

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Illustration 1	g01626060
Typical example

2. Remove tube assemblies (1), (2) and (3) from the engine.

3. Remove the old canister for the secondary fuel filter. Refer to Operation and Maintenance Manual, "Fuel System Secondary Filter - Replace" for the correct procedure.

4. Remove the existing secondary fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base - Remove and Install (Secondary Fuel Filter)" for the correct procedure.

Installation Procedure

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Illustration 2	g01626053
Typical example

1. Install two new setscrews (4) to new secondary fuel filter assembly (1) .

   Note: The new secondary fuel filter base will have a identification mark on the top of the secondary fuel filter base (3). The identification mark is a hole that has a depth of 3 mm (0.1181 inch).

2. Install new secondary fuel filter assembly (1) to the bracket assembly (2). Install the two new setscrews (4) and the new nuts to the mounting bracket (5). Tighten setscrews (4) to a torque of 55 N·m (41 lb ft).

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Illustration 3	g01626056
Typical example

3. Install tube assembly (6) .

4. Install the leakoff pipe (7) to the connector of the pressure relief valve.

5. Install the nut to the leakoff pipe for the injector. Install the olive for the leakoff pipe. Push the leakoff pipe into the connection. Tighten the nut finger tight.

6. Ensure that the connection does not move. By using a suitable tool, tighten the nut to a torque of 26 N·m (19 lb ft) for a steel connection or 21 N·m (15 lb ft) for a brass connection.

7. Press tube assembly (6) into the correct clip.

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Illustration 4	g01626057
Typical example

8. Install tube assembly (8) to the inlet connection of the fuel injection pump and the outlet connection of the secondary fuel filter base. Tighten the nuts to a torque of 26 N·m (19 lb ft) for a steel connection or 21 N·m (15 lb ft) for a brass connection.

   Note: If a compression fitting has been assembled to a connection, tighten the nut until a sharp rise in torque is felt.

9. Install tube assembly (9) .

10. Install tube assembly (10). Install one end of tube assembly (10) to the ECM connection and install the other end of tube assembly (10) to the inlet connection of the secondary fuel filter base. Install two clips. Clip tube assembly (10) onto the bracket.

11. Install the primary fuel filter. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install" for the correct procedure.

12. Prime the fuel system. Refer to Operation and Maintenance Manual, "Fuel System Prime".

13. Run the engine. Check the fuel system for leaks.