0339263 JOHNSON SEAL, Cover to baffle

Engine Design
Cylinder And Valve LocationBore ... 137.2 mm (5.40 in)Stroke ... 152.4 mm (6.00 in)Arrangement and Number of Cylinders ... 65 degree V-12Valves per Cylinder ... 4Combustion ... Direct InjectionFiring Order (Injection Sequence) ... 1,4,9,8,5,2,11,10,3,6,7,12Rotation of Crankshaft (when seen from flywheel end) ... counterclockwiseRotation of Fuel Pump Camshaft (when seen from pump drive end) ... counterclockwise Front end of engine is opposite to flywheel end. Left side and right side of engine are as seen from flywheel end. No. 1 cylinder is the front cylinder on the left side. No. 2 cylinder is the front cylinder on the right side.Fuel System
Fuel System Schematic-Typical Example
(1) Fuel line (to injection pump housing). (2) Injection pump housing. (3) Return line (to tank). (4) Direct injection adapter. (5) Fuel manifold. (6) Priming pump. (7) Bypass valve. (8) Fuel tank. (9) Secondary fuel filters. (10) Fuel line (from transfer pump to secondary fuel filters). (11) Fuel transfer relief valve. (12) Fuel transfer pump. (13) Fuel line (from primary fuel filter to fuel transfer pump). (14) Primary fuel filter. (15) Fuel line (from tank to primary fuel filter).This engine has a pressure type fuel system. There is one fuel injection pump and one fuel injection nozzle for each cylinder. The fuel injection pumps are located in injection pump housing (2). The fuel injection nozzles are installed in direct injection adapters (4) under the valve covers.When the engine is running, fuel is pulled from fuel tank (8) through fuel line (15) and primary fuel filter (14) by fuel transfer pump (12). The transfer pump pushes the fuel through secondary fuel filters (9), to manifold (5) of injection pump housing (2).The fuel manifold (5) supplies fuel for each fuel injection pump. Some of the fuel in the manifold is constantly sent through an orifice in the fitting that connects the manifold to return line (3). The orifice controls the pressure in the manifold and the amount of fuel that goes back to the fuel tank. The constant flow of fuel back to the tank removes air from the system.Individual fuel injection lines carry fuel from the fuel injection pumps to each cylinder. One section of line connects between the fuel injection pump and an adapter on the valve cover base. Another section of line on the inside of the valve cover base connects between the adapter and the fuel injection nozzle.The fuel transfer pump (12) is installed on a drive adapter that is fastened to the rear of the fuel injection pump housing. Fuel transfer pump (12) has a pressure relief valve (11) and a bypass valve (7). Pressure relief valve (11) is located in the transfer pump cover and controls the maximum pressure of the fuel to the fuel injection pump housing. When the pressure gets too high, relief valve (11) opens and directs fuel back to the inlet side of the transfer pump. Bypass valve (7) allows fuel to go around the transfer pump gears when fuel priming pump (6) is in use.When there is air on the inlet side of the system, fuel priming pump (6) is used, before the engine is started, to fill the low pressure side of the fuel system from the fuel tank. When the priming pump is used, movement of fuel through the low pressure side of the system removes air from the lines and components back into the fuel tank.There is no bleed orifice or valve installed on the fuel injection pump housing to vent air from the high pressure part of the fuel system. Air trapped in the fuel injection lines can be vented by loosening all of the fuel injection line nuts where they connect to the adapters in the valve cover base. Move the governor lever to the low idle position. Crank the engine with the starting motor until fuel without air comes from