864626A01 Mercruiser MARINE LONG BLOCK ENGINE

Fuel system - Flow diagram
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(1) Fuel leak off pipe (2) Fuel injection nozzle (3) Fuel return pipe (4) Fuel injection pump (5) Fuel feed pumpLubrication system - Flow diagram
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(6) Turbocharger for S3Q2-T (7) Valve mechanism (8) Valve (9) Push rod (10) Tappet (11) Piston (12) Camshaft (13) Relief valve (14) Oil main gallery (15) Timing gear (16) Oil pump (17) Oil strainer (18) Oil drain plug (19) Oil filter (With built-in bypass valve) (20) CrankshaftCooling system - Flow diagram
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(21) Thermostat (22) Radiator (23) Bypass pipe (24) Water pump (25) Fan (26) Oil coolerInlet and exhaust system - Flow diagram
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Black arrow is Exhaust.White arrow is Inlet. (27) Turbocharger (28) Exhaust manifold (29) Inlet manifoldEngine serial number location
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The engine serial number is stamped on the side of the crankcase.Start/Stop Circuit
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Console (30) Key start switch (31) OFF position (32) ON position (33) Crank position
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Start/stop circuit (30) Key start switch (34) Start relay (35) Engine shutoff timer (36) Disable start switch (37) Engine shutoff relay (38) Engine shutdown solenoid (39) Hydraulic lock switch (40) Fuse box (41) Main relay (42) Battery (43) Starter solenoid (44) Starter motorThe control valve for activating the hydraulics must be in the LOCK position in order to start the engine. When the valve is in the UNLOCK position, current does not flow to the hydraulic lock switch (39). The coil of the disable start relay (36) is de-energized and the start relay (34) will not be activated.When the valve is in the LOCK position, current flows through the hydraulic lock switch. The disable start relay is energized. The start relay is energized when the key start switch (30) is turned to the CRANK position. Current flows from the start relay to the starter motor (44) and the starter solenoid (43). The starter cranks the engine.Note: When the right console and the left console are in the UP position, the control valve for hydraulic activation is in the UNLOCKED position. When either console is in the DOWN position, the control valve for hydraulic activation is in the LOCKED position.Engine Shutdown System
When the key start switch (30) is turned to the OFF position, current stops flowing from the switch to the engine shutoff timer (35) on wire 308-YL. The engine shutdown timer energizes engine shutoff relay (37) by sending power on wire H809-YL. The engine shutoff relay then energizes engine shutdown solenoid (38). The fuel rack is shifted in order to cut off the fuel supply to the engine. The engine shuts down. After 10 seconds, engine shutdown solenoid (38) is de-energized.Engine Shutoff Timer
Engine shutoff timer (35) is activated for 10 seconds after engine is shutoff and key switch (30) is turned to the OFF position. During the 10 seconds, shutoff relay (37) and engine shutdown solenoid (38) are energized. If key switch is turned to the ON position then OFF position, the engine shutoff timer will not reset and remain deactivated. If the key switch is turn to the CRANK position while engine shutoff timer is activated, the timer will reset and reactivate once key switch (30) is turned to the OFF position.