3587399 Volvo.Penta Propeller, Nibral

Illustration 1 g00950107
(1) Fuel injectors (2) Fuel injection pump (3) Fuel tank (4) Water separator (5) Fuel transfer pump (6) Fuel filterWhen the engine is cranking, the fuel is pulled from fuel tank (3) by fuel transfer pump (5). The fuel transfer pump forces the fuel through the fuel filter (6) to the fuel injection pump (2) .The water separator (4) is located downstream of the fuel tank (3). The water separator (4) will trap water that gets inside of the fuel system. The fuel filter (6) removes any contaminants from the fuel before the fuel reaches the fuel injection pump (2) .The fuel injection pump (2) sends fuel at high pressure to each fuel injection nozzle (1). The fuel injection nozzle sprays fuel into a precombustion chamber which slows the rate of combustion in the cylinder. The following items will result from reducing the rate of fuel combustion: prevention of engine knock, reduction of noise and reduction of emissions.
Illustration 2 g00468241
Phases of operation of the fuel injection nozzle (A) Closed valve (B) Open valve (C) Fully open valveThe fuel injection nozzle injects fuel into the precombustion chamber at different angles during two phases. Most of the fuel is injected when the valve is fully open (C). This process is called indirect fuel injection. The results are more even combustion and complete combustion of the fuel at a reduced temperature. Improved fuel combustion will increase power output while reducing emissions and reducing fuel consumption.Excess fuel from the fuel injection nozzles flows through the fuel return line to the fuel tank (3). The excess fuel aids the cooling of the fuel injection nozzles. Also, the fuel return line removes any air that is trapped in the fuel injection nozzles and the fuel injection pump.The fuel injection pump needs fuel for lubrication. If the precision parts of the pump are not adequately lubricated, the components may be easily damaged. The engine must not be started until the fuel injection pump is full of fuel that is free of air.The system must be primed when any part of the system is drained of fuel. The following list contains examples of both service and repairs when you must prime the system:
The fuel filter is changed.
The low pressure fuel line is removed.
The fuel injection pump is removed.
The fuel injection nozzles are removed.
The fuel tank is drained.
A leak exists in the low pressure side of the fuel system.Refer to Systems Operation, Testing and Adjusting, "General Information" for locations of the components for the fuel system.The fuel transfer pump is equipped with a priming button. When the priming lever is moved back and forth, pressure is applied in the fuel system. This will remove any air out of the fuel system.In order to release air from the fuel injection pump and the fuel injection nozzles, the nuts for the fuel injection nozzles should be loosened. The priming lever is operated until fuel, that is free from air, flows from each connection on the fuel injection nozzles. Refer to Testing and Adjusting, "Air In Fuel - Test".Governor
Under normal operating conditions, this engine is controlled electronically. The electronic controller processes a signal from the speed/timing sensor and the electronic controller compares the signal to the desired speed setting. The electronic controller provides a means of controlling the engine speed by adjusting the fuel control lever with the actuator. The output signal of the controller is pulse width modulated. The signal drives the actuator. The actuator controls the movement of the fuel rack.If the electronic controller cannot control the engine, a mechanical governor will protect the engine from an overspeed condition.The fuel rack is connected to the linkage, which controls the fuel injection pump. This linkage is located in the timing case.The governor weight assembly is installed on the front of the gear of the camshaft. The other components of the governor are installed in the timing gear case.
Illustration 3 g00822233
Governor control mechanism in the timing gear case (1) Connection for the linkage to the fuel injection pump (2) Mechanical stop control (3) Lever return spring (4) Control lever (5) Start spring (6) Arm (7) Governor adjustment screwThe movement of the governor weight assembly is transferred to the fuel rack on the fuel injection pump by control lever (4), arm (6) and the linkage to the fuel injection pump. A spring connects the arm and the control lever. This spring controls the movement of the governor weight assembly on the camshaft. When the angle of the control lever changes, tension on the spring changes. This action controls the linkage to the fuel rack on the fuel injection pump, which controls the engine rpm.The bolt for the maximum speed adjustment is mounted in the cylinder block. This adjustment limits the movement of arm (6). This adjustment should only be made by personnel with the correct training.The bolt for the maximum fuel adjustment is mounted in the cylinder block. This adjustment regulates the fuel injection at high engine rpm. This adjustment should only be made by personnel with the correct training.A spring connects the linkage to the fuel injection pump and mechanical stop control (2). When the engine is first started, the spring automatically increases the fuel flow to the cylinders.The fuel injection pump timing and the governor are already preset at the factory. Adjustments to the pump timing and idle rpm should only be made by personnel which have had the correct training. The timing for the fuel injection pump should only change if the camshaft or the cylinder block are replaced. The fuel injection pump timing should not change if the fuel injection pump is reinstalled with a shim that is the same size.The fuel rack automatically returns to the excess fuel position when the engine is stopped. The excess fuel position aids the cold starting of the engine.Fuel Injection Pump
Illustration 4 g01052166
Fuel injection pump (typical example) (1) Fuel line to the fuel injection nozzles (2) Fuel delivery valve (3) Nuts and bolts for mounting the fuel injection pump to the