828716A 2 Mercury CAP-COWL

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Right side view (typical example) (1) Turbine wheel housing (2) Compressor wheel housing (3) Aftercooler (4) Air cleaner assembly (5) Vent lines (6) Deaerator (7) Expansion tank (8) Fuel priming pump (9) Raw water heat exchanger (10) Riser to water cooled manifold (11) Water pump inlet (12) Fuel filter (13) Water cooled manifold (14) Oil pan (15) Oil filter
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Left side view (typical example) (16) Oil filler (17) Raw water heat exchanger (18) Side access cover (if equipped) (19) Jacket water heater
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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 become plugged.Engine efficiency and engine performance depend on adherence to the following operation and maintenance recommendations.
use of recommended fuels
use of recommended coolant
use of recommended lubrication oilsRefer to the Operation and Maintenance Manual for more information. 3408 and 3412 High Performance Marine Engines are available with cylinder blocks that are equipped with side access covers. This will improve access to the internal components of the engine. Starting The Engine
There is a slightly longer cranking period for an engine that is equipped with Electronic Controls than a mechanically governed engine. In order to move the rack, oil pressure is required for the electronic actuator. The check engine light should be ON while the engine is cranking. The check engine light should go OUT after the engine oil pressure is achieved. At temperatures below 0°C (32°F), starting fluid may need to be sprayed into the air cleaner inlet. If the engine fails to start in 30 seconds, the starter switch should be released. The starter motor should be allowed to cool for two minutes before being used again. Refer to Operation And Maintenance for the recommended procedure.Cold Mode Operation
The Electronic Control system performs a cold start strategy for the correct warm-up time after a cold engine start. A cold engine start is approximately less than 5°C (40°F). This cold start strategy is called cold mode. After being activated, this cold mode will increase the idle rpm to 900 to 1000 rpm until the engine is warmed. The Electronic Control system will periodically check the engine response. Once the engine is warm, the Electronic Control system will reduce the idle speed to 600 rpm.After the cold mode is completed, the engine should be operated at low rpm and at low power until the normal operating temperature is achieved. When the engine is running at a low rpm and there is low power demand, the machine will achieve the normal operating temperature more quickly than idling the machine during a no-load condition.Manual Engine Shutoff
A lever for the manual override of the shutoff solenoid is located on the side of the fuel pump. The engine can be shut down by rotating the manual shutoff lever in the counterclockwise direction. The shutoff lever is disabled by rotating the manual shutoff lever in the clockwise direction.If the solenoid has been disabled, the engine can be shut OFF by using the manual shutoff lever. The manual shutoff lever is located on the side of the fuel pump.
Personal injury or death can result from engine overspeed.If the