C175-16 Marine Engine Caterpillar

Removal Procedure

Start By:

1. Remove the rocker shaft and pushrods.

2. Remove the electronic unit injector.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates.

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NOTICE
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Note: Use Tooling (B) to prevent contamination. Cleanliness is an important factor. Before you begin the disassembly procedure, thoroughly clean the exterior of the components. To prevents dirt from entering the internal mechanism. Precision components can be damaged by contaminants or by dirt. Perform disassembly procedures on a clean work surface. Keep components covered and protected at all times.

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".
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   Illustration 1	g02419599

2. Remove bolts (2). Remove heat shield (1). Remove the bolts and disconnect the exhaust manifold. Remove bolts (5). Disconnect inlet manifold (6).

   Note: Exercise care in removing the cylinder head and the gasket in order to avoid contamination of oil supply holes in the cylinder block.

3. Attach Tooling (A) and a suitable lifting device onto cylinder head (3). Cylinder head (3) weighs approximately 68 kg (150 lb). Remove bolts (4). Remove cylinder head (3) from the engine.

   Note: The positioning dowels need to remain in the cylinder block. Remove the dowels if the dowels remain in the cylinder head. Install the new dowels in the cylinder block before installing the cylinder head.

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   Illustration 2	g02419617

4. Remove Integral seal (7) from the cylinder block. Remove fire ring (8).

Installation Procedure

Note: When Tooling (B) is removed be careful to prevent contamination. Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Dirt and other contaminants can damage the precision component. Perform assembly procedures on a clean work surface. Keep components covered and protected at all times.

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Illustration 3	g02419617

1. Inspect fire ring (8) for damage and install new, if necessary. Install fire ring (8). Install a new Integral seal (7) onto the cylinder block.
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   Illustration 4	g02419897

2. Attach Tooling (A) and a suitable lifting device onto cylinder head (3). Cylinder head (3) weighs approximately 68 kg (150 lb). Position cylinder head (3) onto the cylinder block. Lubricate the threads of bolts (4) with oil. Install bolts (4).
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   Illustration 5	g02090575

3. Hand tighten bolts (4) in the numerical sequence to a maximum torque of 15 N·m (11 lb ft). Use Tooling (D) to tighten bolts (4) in the numerical sequence to a torque of 100 ± 10 N·m (75 ± 7 lb ft). Tighten bolts (4) again in the numerical sequence to a torque of 250 ± 15 N·m (185 ± 11 lb ft). Tighten bolts (4) in the numerical sequence for an additional 180 ± 5 degrees.
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   Illustration 6	g02419899

4. Position inlet manifold (6). Install bolts (5). Position the exhaust manifold and install the bolts. Position heat shield (1) and install bolts (2).

5. Fill the cooling system with coolant. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change".

End By:

1. Install the rocker shaft and pushrods.

2. Install the electronic unit injector.