C6.6 Engines for Caterpillar Built Machines Inlet and Exhaust Valves - Remove and Install Caterpillar

Removal Procedure

Start By:

1. Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove" for the correct procedure.

1. Clean the bottom mating surface of the cylinder head. Check the depth of the valves below the face of the cylinder head before the valve springs are removed. Refer to Specifications, "Cylinder Head Valves" for the correct dimensions.

2. Place a temporary identification mark on the heads of the valves to identify the correct position.

   Note: Inlet valves have a recess in the center of the head.

3. Use a suitable lifting device to position the cylinder head with the valve springs upward. The weight of the cylinder head is approximately 65 kg (143 lb).

   Note: Ensure that the cylinder head is kept on a clean, soft surface to prevent damage to the machined face.

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   Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

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   Illustration 1	g01335985
   Typical example

4. Install Tooling (A) in position on the cylinder head to compress appropriate valve spring (3).
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   NOTICE
   Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.

5. Apply sufficient pressure to Tooling (A) to remove valve keepers (1).

   Note: Do not compress the spring so that valve spring retainer (2) touches valve stem seal (4).

6. Slowly release pressure on Tooling (A).
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   Illustration 2	g01335986

7. Remove valve spring retainer (2). Remove valve spring (3).

8. Repeat steps 4 to 7 for the remaining valves.

9. Remove Tooling (A).

10. Remove valve stem seals (4).

11. Use a suitable lifting device to carefully turn over the cylinder head.

12. Remove valves (5).

Installation Procedure

1. Clean all components of the cylinder head assembly. Ensure that all ports, all coolant passages, and all lubrication passages in the cylinder head are free from debris. Follow Steps 1.a through 1.d to inspect the components of the cylinder head assembly. Replace any components that are worn or damaged.

   1. Inspect the cylinder head for wear and for damage. Refer to System Operation, Testing and Adjusting, "Cylinder Head Inspect".

   2. Inspect the valve seats for wear and for damage. Refer to Specifications, "Cylinder Head Valves" for further information.

   3. Inspect the valve guides for wear and for damage. Refer to Specifications, "Cylinder Head Valves" and System Operation, Testing and Adjusting, "Valve Guide - Inspect" for further information.

   4. Inspect the valves for wear and for damage. Refer to Specifications, "Cylinder Head Valves" for the correct procedure.

   5. Inspect valve springs (3) for damage and for the correct length. Refer to Specifications, "Cylinder Head Valves" for the correct procedure.
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   Illustration 3	g01335986

2. Lubricate the stems of valves (5) with clean engine oil. Install valves (5) in the appropriate positions in the cylinder head. Check the depth of the valves below the face of the cylinder head. Refer to System Operation, Testing and Adjusting, "Valve Depth - Inspect" for more information.

3. Use a suitable lifting device to carefully turn over the cylinder head. The weight of the cylinder head is approximately 65 kg (143 lb).

   Note: Ensure that all the valves remain in place.

4. Install new valve stem seals (4) onto each of the valve guides.

   Note: The outer face of the valve guides must be clean and dry before installing valve stem seals (4).

5. Install valve spring (3) onto the cylinder head. Position valve spring retainer (2) on valve spring (3).
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   Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

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   Illustration 4	g01335985

6. Install Tooling (A) in the appropriate position on the cylinder head to compress valve spring (3).
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   NOTICE
   Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.

7. Apply sufficient pressure to Tooling (A) to install valve keepers (1).

   Note: Do not compress the spring so that valve spring retainer (2) touches valve stem seal (4).

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   The valve spring keepers can be thrown from the valve when the valve spring compressor is released. Ensure that the valve spring keepers are properly installed on the valve stem. To help prevent personal injury, keep away from the front of the valve spring keepers and valve springs during the installation of the valves.

8. Carefully release the pressure on Tooling (A).

9. Repeat steps 5 to 8 for the remaining valves.

10. Remove Tooling (A) from the cylinder head.

11. Use a suitable lifting device to position the cylinder head on a support. Ensure that the heads of the valves are not obstructed. Gently strike the top of the valves with a soft hammer to ensure that valve keepers (1) are properly installed.

End By:

1. Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install" for the correct procedure.