C3.3 Industrial Engine Caterpillar

Removal Procedure

Start By:

1. Remove the rocker shaft assembly. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Remove".

Note: Either Tooling (A) can be used. Use the Tooling that is most suitable.

Note: The following procedure should be adopted in order to remove the valve springs when the cylinder head is installed to the engine. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install" for the procedure to remove the valve springs from a cylinder head that has been removed from the engine.

Note: Ensure that the appropriate piston is at the top center position before the valve spring is removed. Failure to ensure that the piston is at the top center position may allow the valve to drop into the cylinder bore.

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NOTICE
Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.

1. Follow Steps 1.a through 1.d in order to position the appropriate piston at top center.

   1. Install Tooling (B) and Tooling (C) in position on the cylinder head in order to compress a valve spring for the appropriate piston.

   2. Use Tooling (B) and Tooling (C) in order to compress valve spring (3) and open the valve slightly.

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

   3. Use Tooling (A) in order to rotate the crankshaft carefully, until the piston touches the valve.

      Note: Do not use excessive force to turn the crankshaft. The use of force can result in bent valve stems.

   4. Continue to rotate the crankshaft and gradually release the pressure on Tooling (B) and Tooling (C) until the piston is at the top center position. The valve is now held in a position that allows the valve spring to be safely removed.
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   NOTICE
   Do not turn the crankshaft while the valve springs are removed.

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   Illustration 1	g01430292
   Typical example

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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.

2. Apply sufficient pressure to Tooling (B) and Tooling (C) in order to allow removal of the valve keepers (1). Remove valve keepers (1).

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

3. Slowly release the pressure on Tooling (B) and Tooling (C).

4. Remove valve spring retainer (2) and remove valve spring (3).

5. If necessary, remove the valve stem seals.

6. Repeat Steps 2 through 5 in order to remove the remaining valve spring from the appropriate cylinder.

7. Remove Tooling (B) and Tooling (C).

Installation Procedure

Note: Either Tooling (A) can be used. Use the Tooling that is most suitable.

1. Inspect the valve springs for the correct length. Refer to Specifications, "Cylinder Head Valves " for more information.

2. If necessary, install a new valve stem seal onto the valve guide.

   Note: The outer face of the valve guide must be clean and dry before installing the valve stem seal.

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   Illustration 2	g01430292
   Typical example

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   Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

3. Install valve spring (3) onto the cylinder head. Position valve spring retainer (2) onto valve spring (3).

4. Install Tooling (B) and Tooling (C) in the appropriate position on the cylinder head in order to compress the valve spring.
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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 (B) and Tooling (C) in order to install valve keepers (1). Install the valve spring keepers (1).

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

6. Carefully release the pressure on Tooling (B) and Tooling (C).

   Note: Ensure that the valve keepers are correctly seated.

7. Repeat Steps 2 to 6 for the remaining valves.
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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. Remove Tooling (B) and Tooling (C).

End By:

1. Install the rocker shaft assembly. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Install".