COVER AS-CENTER 3777814 - Caterpillar

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Front view (typical example) (20) Fuel filter (21) Raw water inlet (22) Oil filter (23) Turbo cooling line (24) Jacket water pump (25) Raw water pump
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Rear view (typical example) (26) Personality module (27) Electronic governor control box (28) Flywheel assemblyEngine Information
The Caterpillar 3408 and 3412 High Performance Marine Engines have the following qualities.
twin turbochargers
jacket water aftercooled
direct fuel injectionThese engines are designed for either right or left hand service. The 3408 is an electronically governed engine. The 3412 is available with a mechanical governor, an electronic governor, or with a hydramechanical governor.The electronic engine control system is a microprocessor based device that is used in order to provide fuel.
electronic governing
automatic fuel ratio control
torque rise shaping
cold mode operationThere are two data links for communication. The first data link monitors the characteristics of the engine. The other data link provides diagnostic information. The electronic engine control provides a feature that allows engine synchronization. With this feature, multiple engines can be controlled from a single lever. The engines have water cooled exhaust manifolds, risers and turbochargers. These components will minimize the heat that is radiated into the engine room. Changes to the cooling system of these engines minimize the weight and the size of the engine. These changes also improve the engine's performance. The cooling system's heat exchanger, expansion tank, and deaerator help to prevent cavitation of the water pump. This helps to maintain the performance of the jacket water pump.The 3408 and 3412 High Performance Marine Engines use a low emission system which is integrated into the engine air cleaner. This system eliminates the venting of oil vapors into the engine room. The closed crankcase ventilation system is completely enclosed. This system requires a minimum amount of maintenance.The engines have individual injection pumps and fuel lines. There is one injection pump for each cylinder. The injection pumps meter the high pressure fuel. The fuel is then sent to the fuel injection nozzles.New fuel injection lines are made from high strength steel. The collar at the end of the fuel line reinforces the fuel line connections. The collar also increases system reliability.The fuel system of the 3408 and 3412 High Performance Marine Engines have been designed with an increased capacity. The following changes to the engine are listed below:
an increase in the plunger's effective area
increased length in the stroke that is produced by the camshaft
increased rate of injection by the camshaftThese changes influence the following items.
a significant increase in injection pressure
an increase in volume
a reduction in injection durationThis will yield the following benefits:
higher power output
cleaner combustion
lower smoke levels
improved fuel economyThe cooling system has a gear-driven centrifugal pump and a raw water heat exchanger. The system uses two thermostats that regulate the coolant temperature.The engine lubrication system also uses a gear-driven pump. The system utilizes an oil cooler and a filtration system. Bypass valves provide unrestricted flow of lubrication oil to the engine parts when oil viscosity is high, or if either the oil cooler or the oil filter elements should