324E and 329E Excavators and 329E MHPU Mobile Hydraulic Power Unit C7.1 Engine Supplement Caterpillar

Removal Procedure

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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.

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Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.

Note: Cap all tube assemblies and fittings that are disconnected in order to prevent fluid loss. This action will also keep contaminants out of the systems.

1. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change" for the correct draining and filling procedures.

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Illustration 1	g02448878

2. Remove bolts (2) and position tube (1) out of the way.

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Illustration 2	g02448885

3. Disconnect harness assemblies (6) .

4. Remove flame detection temperature sensor (4) .

5. Remove tube assemblies (3) and tube assembly (5) .

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Illustration 3	g02119780

6. Remove nuts (11) and remove combustion head (10) .

7. Remove gasket (9), tube assembly (8), and gasket (7) .

8. Remove studs (12) .

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Illustration 4	g02119813

9. Remove fittings (13) and (14) .

10. Remove spark plug (15) and remove fitting (16) .

Installation Procedure

1. Install combustion head (10) in the reverse order of removal.

   1. Apply Tooling (A) onto the threads of studs (12). Install the studs. Tighten studs (12) to a torque of 17 ± 2 N·m (150 ± 18 lb in).

   2. Apply Tooling (A) onto the threads of the studs and nuts (11). Tighten nuts (11) in a crisscross pattern to a torque of 23 ± 3 N·m (204 ± 27 lb in). Tighten nuts (11) again in a crisscross pattern to a torque of 28 ± 3 N·m (21 ± 2 lb ft). Tighten nuts (11) again in a crisscross pattern to a torque of 28 ± 3 N·m (21 ± 2 lb ft).

   3. Tighten fitting (16) to a torque of 60 ± 6 N·m (44 ± 4 lb ft).

   4. Tighten fittings (14) and (13) to a torque of 30 ± 2 N·m (22 ± 1 lb ft).

   5. Tighten spark plug (15) to a torque of 47 ± 4 N·m (35 ± 3 lb ft).

   6. Apply Tooling (A) to the threads of flame detection temperature sensor (3) and install the sensor. Tighten flame detection temperature sensor (3) to a torque of 45 ± 5 N·m (33 ± 3 lb ft).

   7. Tighten tube assemblies (5) to a torque of 16 ± 2 N·m (142 ± 18 lb in).

   8. Tighten tube assembly (6) to a torque of 11 ± 2 N·m (97 ± 18 lb in).

2. Perform the ARD ignition test. Refer to Troubleshooting Manual, "ARD Ignition - Test".