3490A 3 Mercury CYLINDER BLOCK AND CRANKCASE ASSEMBLY (SERIAL #2670574 AND B

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: The inlet manifold that is used on 3013, 3014, and 3024 Engines is removable as a separate part. The inlet manifold on the 3003 Engine is part of the valve mechanism cover.
Illustration 1 g00592619
Loosen clamp (1) and remove breather hose (2) from valve mechanism cover (3) .
Illustration 2 g00592620
Remove three cap nuts (4) that fasten the valve mechanism cover to the engine.
Remove valve mechanism cover (3) and the gasket for the valve mechanism cover.Installation Procedure ( 3003 Engine)
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Clean all surfaces thoroughly. Inspect the condition of the gasket for the valve mechanism cover. Replace the gasket, if necessary.
Illustration 3 g00592620
Position the gasket for the valve mechanism cover on the cylinder head and install valve mechanism cover (3) .Note: Before you install three cap nuts (4), lubricate the threads with clean engine oil.
Install cap nuts (4) and tighten the nuts to a torque of 11 N m (8 lb ft).
Illustration 4 g00592619
Install breather hose (2) and clamp (1) for the crankcase breather.Removal Procedure ( 3013, 3014, and 3024 Engines)
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: The inlet manifold that is used on 3013, 3014, and 3024 Engines is removable as a separate part. The inlet manifold on the 3003 Engine is part of the valve mechanism cover.
Illustration 5 g00592664
Remove the breather hose from crankcase breather (2) .
Remove cap nuts (1) from valve mechanism cover (3) .
Remove valve mechanism cover (3) from the base for the valve mechanism cover.Installation Procedure ( 3013, 3014, and 3024 Engines)
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Clean all surfaces thoroughly. Inspect the condition of the gasket for the valve mechanism cover. Replace the gasket, if necessary.
Illustration 6 g00592664
Position the gasket for the valve mechanism cover on the cylinder head and install valve mechanism cover (3) .Note: Before you install cap nuts (1), lubricate the threads with clean engine oil.
Install cap nuts (1) and tighten the cap nuts to the following torque: 3013 Engine ... 10 N m (90 lb in) 3014 and 3024 Engines ... 14 N m (11 lb ft)
Install the breather hose on crankcase breather (2) .