14L Motor Grader Combustion Head - Remove and Install Caterpillar


Combustion Head - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
Loctite C5A Copper Anti-Seize Lubrication 
5P-4996  Plug 

------ WARNING! ------

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.


------ WARNING! ------

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




    Illustration 1g03500336

  1. Remove panel (1).


    Illustration 2g03503576

  2. Remove cotter pin (3) and disconnect rod assembly (2).


    Illustration 3g03503656

  3. Remove bolts (4) and door (5).


    Illustration 4g03503658

  4. Remove bolts (6).


    Illustration 5g03503659

  5. Remove bolts (7).


    Illustration 6g03503660

  6. Remove bolts (9) and post (8).


    Illustration 7g03503661

  7. Remove bolt (10) and clamps (11).


    Illustration 8g03503956

  8. Disconnect hose assemblies (12) and tube assemblies (13).


    Illustration 9g03503958

  9. Remove bolt (14). Disconnect tube assembly (15) and harness assembly (16).


    Illustration 10g03503959

  10. Remove bolt (17) and clip (18). Disconnect flame detection temperature sensor (19).


    Illustration 11g03504012

  11. Remove bolts (20) and disconnect (21).


    Illustration 12g03504014

  12. Disconnect band clamp (22).


    Illustration 13g03504015

  13. Remove cable straps (23) and (24).


    Illustration 14g03504416

  14. Remove nuts (29) and remove combustion head (28). Remove gasket (27), tube assembly (26), and gasket (25).

    Note: The gaskets are one time use only. Replace upon installation.

  15. Remove studs (30).


    Illustration 15g03504422

  16. Remove fittings (31) and (32). Remove spark plug (33) and remove filter (34).

Installation Procedure

  1. Install combustion head (24) in the reverse order of removal.

    1. Apply Tooling (A) onto the threads of studs (30). Install studs (30). Tighten studs (30) to a torque of 17 ± 2 N·m (150 ± 18 lb in).

    2. Apply Tooling (A) onto the threads of the studs (30) and nuts (29).


      Illustration 16g02174426

    3. Using the torque sequence illustrated in Illustration 16to tighten nuts (29) to a torque of 23 ± 3 N·m (204 ± 27 lb in). Tighten nuts (29) again using the torque sequence illustrated in Illustration16 to a torque of 28 ± 3 N·m (21 ± 2 lb ft). Tighten nuts (29) again using the torque sequence illustrated in Illustration 16 to a torque of 28 ± 3 N·m (21 ± 2 lb ft).

    4. Tighten filter (34) to a torque of 60 ± 6 N·m (44 ± 4 lb ft).

    5. Tighten fitting (32) to a torque of 30 ± 2 N·m (22 ± 1 lb ft).

    6. Tighten fitting (31) to a torque of 60 ± 6 N·m (44 ± 4 lb ft).

    7. Tighten spark plug (33) to a torque of 47 ± 4 N·m (35 ± 3 lb ft).

    8. Apply Tooling (A) to the threads of flame detection temperature sensor (19) and install the sensor. Tighten flame detection temperature sensor (19) to a torque of 45 ± 5 N·m (33 ± 3 lb ft).

    9. heck the coolant level. If necessary, refer to Operation and Maintenance Manual, "Coolant - Change" for the proper filling procedures.

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