C4.4 Marine Generator Set Engines Caterpillar

Removal Procedure

Start By:

1. Remove the inlet valves and the exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".

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Illustration 1	g00937142
Typical example

1. Use Tooling (A) in order to remove valve seat inserts from the cylinder head.

2. Repeat the procedure for the remaining valve seat inserts.

   Note: When new valve seat inserts are installed, new valves and new valve guides must be installed.

3. Remove the valve guides. Install partially finished valve guides. Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Guides - Remove and Install".

Installation Procedure

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Illustration 2	g00937187
Typical example

1. Put the valve seat insert in position. Carefully tap the valve seat insert in order to start the installation. Use Tooling (B) to seat the valve seat insert in the cylinder head.

2. Repeat the procedure for the remaining valve seat inserts.

   Note: Refer to Specifications for more information on the valve seat inserts.

3. After installing the valve guides and valve seat inserts, the valve guides must be reamed and the valve seat inserts must be cut to the finished diameter. The valve guides and valve seat inserts are cut and reamed in one operation. This procedure ensures the concentricity of the valve seat to the valve guide in order to create a good seal. Refer to Specifications, "Cylinder Head Valves" for the finished diameter of the valve guides and valve seat inserts.

4. Position Tooling (C) into the valve guide. Carefully turn the handle in a clockwise direction and gradually move the reamer into the valve guide until the valve guide is reamed to the finished size.

5. Continue to turn the handle in a clockwise direction in order to cut the valve seat insert. Remove the minimum amount of material in order to ensure a good valve seat. Keep the valve seat as narrow as possible.

6. Remove Tooling (C). Clean the debris from the valve guide and the valve seat.

End By:

1. Install the inlet valves and the exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".