G3512H and G3516H Generator Set Engines Cylinder Head - Disassemble Caterpillar

Disassembly Procedure

Start By:

1. Remove the cylinder head.

Valve Lifters

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Illustration 1	g06606272

Note: Mark lifter assemblies for installation purposes.

1. Remove lifter assemblies (1) from cylinder head (2).
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   Illustration 2	g06606291

2. Remove lifter guide springs (3) from lifter assemblies (1).

Inlet and Exhaust Valves

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Illustration 3	g06606315

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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.

1. Install Tooling (A) to compress valve spring (5) and valve spring (4).
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   Illustration 4	g06606514

2. Remove retainer locks (6) from valve (7).

3. Remove Tooling (A).
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   Illustration 5	g06606568

4. Remove rotocoil assembly (9), valve spring (5), valve spring (4), washer (8), and valve (7).

5. Repeat Step 1 through Step 4 to remove the remaining valves.
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   Illustration 6	g00598111

6. Use Tooling (B) to check valve spring force. Refer to Specifications, UENR0513, "G3516H and G3520H Generator Set Engines", "Cylinder Head Valves" for the correct valve spring force.

Inlet and Exhaust Valve Seat Inserts

Note: Combustion surface and valve seat insert bores must be free of contaminants and debris.

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When you are using hydraulic cylinders and puller studs, always ensure that the rated capacity of the puller stud meets or exceeds the rated capacity of the hydraulic cylinder. If the puller stud does not meet or exceed the rated capacity of the hydraulic cylinder, a sudden failure of the puller stud could occur. The sudden failure of the puller stud could result in personal injury or death.

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Illustration 7	g02736157

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Illustration 8	g02736098

1. Insert Tooling (C) in the bore of valve seat insert (10).
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   Illustration 9	g02736198

2. Slide the lower slide to lock Tooling (C) in place.

   Note: The valve seat insert may break during removal. Ensure that all fragments of the valve seat insert are removed.

3. Attach Tooling (D) to Tooling (C) and remove the valve seat insert (10).
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   Illustration 10	g02736518

4. Lift Tooling (C) off the cylinder head (2) and slide the lower slide to unlock Tooling (C).
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   Illustration 11	g02736560

5. Slide the collets of Tooling (C) and valve seat insert (10) back. Then remove valve seat insert.

Inlet and Exhaust Valve Guides

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Illustration 12	g06606695

Note: Do not use a hammer to remove the valve guides.

1. Use Tooling (E) and a suitable press to remove inlet valve guides (11) and exhaust valve guides (12).

Adapter

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Illustration 13	g06606721

1. Remove adapter (13).
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   Illustration 14	g06606737

2. Remove and discard O-ring seal (14) and washer (15).

Bridge Dowels

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Illustration 15	g06606747

1. Use Tooling (F) to remove dowels (16).