0377372 EVINRUDE CABLE,Throttle,12'

Fuel System
SCHEMATIC OF THE FUEL SYSTEM
1. Line for the return of fuel to the fuel tank or standpipe (if so equipped). 2. Fuel priming pump. 3. Fuel filter bypass valve. 4. Fuel filter. 5. Fuel injection pump. 6. Precombustion chamber. 7. Fuel supply line. 8. Primary fuel filter. 9. Fuel transfer pump. 10. Fuel transfer pump bypass valve. 11. Fuel manifold.This engine has a pressure type fuel system. There is an injection pump and injection valve for each cylinder. The injection pumps are in the pump housing on the right side of the engine. The injection valves are in the precombustion chambers, in the cylinder heads.Fuel for the fuel system comes from the fuel tank through supply line (7) to primary fuel filter (8). The fuel goes through the primary fuel filter and to the fuel transfer pump (9).The transfer pump sends the fuel through a passage in the accessory drive housing and fuel filter housing to fuel filter (4). Fuel filter bypass valve (3) keeps the pressure of the fuel to approximately 27 psi (1.9 kg/cm2). Since the transfer pump (9) sends more fuel than is needed to keep the pressure of the fuel at approximately 27 psi (1.9 kg/cm2), the extra fuel returns to the fuel tank through line (1).Fuel goes from the fuel filter to fuel manifold (11) in the pump housing. The fuel manifold is the source of fuel supply for the injection pumps. The injection pumps send fuel through lines to the injection valves. The injection valves change the fuel to the correct fuel characteristic (spray pattern) for good combustion in the cylinders.Use priming pump (2) to put pressure in the fuel system when needed. The priming pump can also be used to remove air from the fuel system.Fuel Injection Pump Operation
Injection pump plungers (3) and lifter assemblies (8) are lifted by cams on camshaft (9) and always make a full stroke. The force of springs (7) hold the lifter assemblies against the cams of the camshaft.Fuel from fuel manifold (5) goes through inlet passage (2) in the barrel and into the chamber above pump plunger (3). During injection, the camshaft cam moves the pump plunger up in the barrel. This movement will close the inlet passage and the fuel will go through the fuel lines to the injection valves.The amount of fuel sent to the injection valves is controlled by turning the pump plunger in the barrel. When the governor moves fuel rack (4), the fuel rack moves gear segment (6) that is fastened to the bottom of the pump plunger.
CROSS SECTION OF THE HOUSING FOR THE FUEL INJECTION PUMPS
1. Check valve. 2. Inlet passage in pump barrel. 3. Pump plunger. 4. Fuel rack. 5. Fuel manifold. 6. Gear segment. 7. Spring. 8. Lifter assembly. 9. Camshaft.Fuel Injection Valve
CROSS SECTION OF THE PRECOMBUSTION CHAMBER AND FUEL INJECTION VALVE
1. Fuel injection line. 2. Nut. 3. Glow plug. 4. Body. 5. Nozzle assembly. 6. Precombustion chamber.Fuel, under high pressure from the injection pumps, is sent through the fuel lines to the fuel injection valves. When the fuel under high pressure goes into the nozzle assembly, the check valve inside the nozzle opens and the fuel goes into the precombustion chamber. The injection valve changes the fuel to the correct fuel characteristics (spray pattern).Mechanical Governor
The governor is in the housing for the accessory drive and governor. The governor control is connected to the control lever on the engine governor. The governor controls the amount of fuel needed to keep the engine at the desired rpm.The governor has weights (8), which are driven by the engine. The force of the weights on retainer (3), bearing (7), and lever assembly (6), puts force against the force of governor spring assembly (2). These two forces move the rack (1) which controls the amount of fuel to the engine to keep the engine operating at a constant speed.
MECHANICAL GOVERNOR
1. Rack. 2. Governor spring assembly. 3. Retainer. 4. Bearing. 5. Cover. 6. Lever assembly. 7. Bearing. 8. Governor weights. 9. Tube.The governor control, controls only the compression of governor spring assembly (2). Compression of the spring always pushes to give more fuel to the engine. The centrifugal force (rotation) of governor weights (8) is always pulling to get a reduction of fuel to the engine. When these two forces are in balance, the engine runs at the desired rpm (governed rpm).When the load on the engine goes up, there is a reduction in the rpm of the engine and the rotation of governor weights (8) will get slower. (The governor weights will move toward each other). Governor spring assembly (2) moves rack (1) to give more fuel to the engine. Engine rpm goes up until the rotation of the governor weights is fast enough to be in balance with the force of the governor spring assembly.When there is a reduction in the engine load, there will be an increase in the rpm of the engine and the rotation of the governor weights (8) will get faster. This will move retainer (3), bearing (7), and lever assembly (6), and puts more force against the governor spring assembly. There is now a reduction in the amount of fuel to the engine. Engine rpm goes down until the centrifugal force (rotation) of the governor weights is in balance with the force of the governor spring assembly. When these two forces are in balance, the engine will run at the desired rpm (governed rpm).Oil from the engine gives lubrication to the governor. Oil from the bearing assembly for the accessory shaft goes to cover (5) through tube (9). A passage in the cover gives oil to bearing (4). The governor shaft has oil holes in it to give lubrication to the bearing in retainer (3). The other parts of the governor get lubrication from splash lubrication (oil thrown by other parts). Oil from the governor goes into the housing for the timing gear through an oil return hole in the front of the housing