41717 Mariner BRACKET, PRIMER

The diaphragm-type fuel transfer pump mounts on the fuel injection pump housing and is driven by a lobe on the injection pump camshaft. The pump draws fuel from the tank and delivers it to a spin-on throw-away type filter. The filter has a combination primary-secondary type construction. A primary fuel filter attachment can be installed between the fuel supply and the transfer pump to strain larger particles from the fuel.Filtered fuel flows through a shutoff solenoid, mounted on the fuel injection pump housing, into a fuel manifold. The solenoid operates electrically and stops fuel flow when the engine electrical system is shut off.Fuel in the manifold flows through the barrel assembly inlet port into the area above the injection pump plunger. During injection, the camshaft forces the plunger upward in the barrel. The end of the plunger closes the inlet port and forces the fuel out through high pressure injection lines to the nozzles.The injection nozzles are located under the valve cover and are held in place by clamps. The nozzle tip projects from the head into the cylinder bore. Atomized fuel is sprayed in a cone-shaped pattern through four .0128 in. (0.325 mm) orifices into the cylinder.During injection, a small amount of fuel leaks past the valve guide in the nozzle body to lubricate its moving parts. Any excess leakage flows from the nozzle to a fuel return manifold under the valve cover of each cylinder head. External lines connect the manifolds and return the fuel to the tank.Governor Operation
The hydraulic governor maintains speed at the rpm selected.When the engine is operating, the balance between the centrifugal force of the revolving weights and the force of the governor spring controls the movement of the valve. The valve directs pressure oil to either side of a rack-positioning piston. Depending upon the position of the valve, the rack is moved to increase or decrease the amount of fuel to the engine to compensate for load variation.
GOVERNOR (Earlier Governor)
1. High idle spring. 2. Weights. 3. Valve. 4. Cylinder. 5. Low idle spring. 6. Piston. 7. Sleeve.
GOVERNOR (Later Governor)
1. Low idle screw. 2. Weights. 3. Valve. 4. Cylinder. 5. High idle spring. 6. Low idle spring. 7. Piston. 8. Sleeve.Pressurized lubrication oil, directed through passages in the fuel injection pump housing, enters a passage in the governor cylinder. The oil encircles a sleeve within the cylinder. This oil is then directed through a passage in the piston, where it contacts the valve.When engine load increases, the revolving weights slow down. The weights move toward each other and allow the governor spring to move the valve forward. As the valve moves, a small passage in the piston opens to pressure oil. Oil flows through this passage and fills the chamber behind the piston. The pressure forces the piston and rack forward, increasing the amount of fuel to the engine. Engine rpm increases until the revolving weights rotate fast enough to balance the force of the governor spring.When engine load decreases, the revolving weights speed up and the toes on the weights move the valve rearward, allowing oil behind the piston to flow through a drain passage opened at the rear of the piston. At the same time, pressure oil between the sleeve and the piston forces the piston and rack rearward. This decreases the amount of fuel to the engine and the engine slows down. When the force of the revolving weights balances governor spring force, engine rpm will be the same as before.At engine shut down, a low idle spring returns the valve guide and valve to the full load position. This moves the fuel rack to the full travel position, and assures full fuel flow through the fuel injection pump at engine start up.Injection Nozzle Operation 9L9263 Nozzles
The nozzle is an inward opening, differential hydraulically-operated, hole-type nozzle.The nozzle body incorporates the inlet fitting, tip and valve guide. The inward opening valve is spring-loaded. Spring preload is adjusted through the pressure adjusting screw; valve lift is controlled by the adjustable lift screw. Both adjusting screws are secured by the locknut. A nylon compression seal under the inlet fitting "banjo" prevents cylinder compression leakage. The carbon dam at the lower end of the body prevents carbon accumulation in the cylinder head bore. Fuel, under pressure from the injection pump, flows through the inlet, around the valve, filling the nozzle body. When the pressure acting on the differential area overcomes the spring force, the nozzle valve lifts