C6.6 Engines for Caterpillar Built Machines Cylinder Head - Remove Caterpillar

Removal Procedure

Start By:

1. If necessary, remove the secondary fuel filter and the fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base - Remove and Install".

2. If necessary, remove the fuel priming pump and the primary fuel filter. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install".

3. Remove the exhaust manifold. Refer to Disassembly and Assembly, "Exhaust Manifold - Remove and Install".

4. Remove the fuel manifold. Refer to Disassembly and Assembly, "Fuel Manifold - Remove and Install".

5. Remove the electronic control module and the mounting bracket. Refer to Disassembly and Assembly, "Electronic Control Module - Remove and Install".

6. Remove the electronic unit injectors. Refer to Disassembly and Assembly, "Electronic Unit Injector - Remove".

7. Remove the valve mechanism cover base. Refer to Disassembly and Assembly, "Valve Mechanism Cover Base - Remove".

8. Remove the glow plugs. Refer to Disassembly and Assembly, "Glow Plugs - Remove and Install".

1. Drain the coolant from the cooling system into a suitable container for storage or for disposal. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change" for the correct draining procedure.
   Show/hide table

   Illustration 1	g01340072
   Typical example

2. Disconnect the upper radiator hose from water temperature regulator housing (1) on the cylinder head.
   Show/hide table

   Illustration 2	g01340075
   Typical example

3. Remove the air inlet hose from inlet connection (3) on inlet manifold (2).

4. Follow Steps 4.a and 4.b in order to disconnect harness assembly (4) from coolant temperature sensor (5).

   1. Slide the locking tab into the unlocked position.

   2. Disconnect harness assembly (4) from coolant temperature sensor (5).

5. Follow Steps 5.a and 5.b in order to disconnect harness assembly (4) from boost pressure sensor (6).

   1. Slide the locking tab into the unlocked position.

   2. Disconnect harness assembly (4) from boost pressure sensor (6).

6. Follow Steps 6.a and 6.b in order to disconnect harness assembly (4) from inlet air temperature sensor (7).

   1. Slide the locking tab into the unlocked position.

   2. Disconnect harness assembly (4) from inlet air temperature sensor (7).

7. Remove all cable straps that secure harness assembly (4) to the cylinder head or to the inlet manifold. The harness assembly should be positioned in order to avoid causing an obstruction during the removal of the cylinder head.
   Show/hide table

   Illustration 3	g01340077
   Typical example

8. Loosen the tube clips for tube assembly (8). Remove tube assembly (8) for the fuel return from the cylinder head and from the transfer pump. Plug the port in the transfer pump with a new plug. Cap the tube assembly with new caps.

9. If the engine has a wastegate solenoid, loosen the tube clips for tube assembly (9). Remove tube assembly (9) from the wastegate solenoid and from the cylinder head. Plug the port in the wastegate solenoid with a new plug. Cap the tube assembly with new caps.
   Show/hide table

   Illustration 4	g01340080
   Typical example

10. Remove bolts (10). Remove bypass tube (11) from the cylinder head. Remove O-ring seals (12) and (13) from bypass tube (11).
    Show/hide table

    Illustration 5	g01340081

    Show/hide table

    Illustration 6	g01340083
    Sequence for tightening the bolts for the cylinder head

11. Gradually loosen bolts (14) in the reverse numerical order to the tightening sequence. Refer to the illustration 6.

    Note: Follow the correct sequence in order to help prevent distortion of the cylinder head.

12. Remove bolts (14) from cylinder head (15).
    Show/hide table

    Illustration 7	g01340086
    Typical example

13. Attach a suitable lifting device (16) to cylinder head (15). Support the weight of the cylinder head. The weight of the cylinder head is approximately 66 kg (145.5 lb).

    Note: A spreader bar must be used in order to distribute the weight of the cylinder head during the lifting operation.

14. Use suitable lifting device (16) to carefully lift cylinder head (15) off the cylinder block.

    Note: Do not use a lever to separate the cylinder head from the cylinder block. Take care not to damage the machined surfaces of the cylinder head during the removal procedure.

    Show/hide table

    NOTICE
    Place the cylinder head on a surface that will not scratch the face of the cylinder head.

    Show/hide table

    Illustration 8	g01340089

15. Remove cylinder head gasket (17).

16. Note the position of dowels (18) in the cylinder block.

17. If necessary, remove water temperature regulator (1) from cylinder head (15). Refer to Disassembly and Assembly, "Water Temperature Regulator - Remove and Install".

18. If necessary, remove inlet manifold (2) from cylinder head (15). Refer to Disassembly and Assembly, "Inlet manifold - Remove and Install".