GENERATOR GP 5089207 - Caterpillar

Fuel System Components (Right Side)
(3) Cold start heater. (8) Fuel lift pump.There is a small screen in fuel lift pump (8). The pump also has a lever to prime the fuel system (remove the air). The orifice in the cover of fuel filter (7), to release air in the system, is in the inlet side of the filter. The orifice is connected to the fuel tank by return line (4).Cold start heater (3) is installed in the inlet manifold. It is controlled by the ignition switch.
Unless there is fuel flow through the valve body of the cold start heater, the unit could be destroyed. The fuel supply line to it must also be free of air or damage will result. A cold start heater that is damaged will let fuel drain into the inlet manifold when the engine is running. This could cause exhaust smoke.
Fuel Injectors
Fuel Injector
(1) Outlet for return fuel (leakage). (3) Fuel inlet (from fuel injection pump). (5) Compression spring. (6) Body. (8) Nozzle cap nut. (9) Needle valve. (10) Nozzle. (11) Orifices (four).Fuel, under high pressure from the fuel injection pump, goes through the hole in fuel inlet (3). The fuel then goes around needle valve (9), fills the inside of nozzle (10) with fuel and pushes against valve (9) and compression spring (5). When the force made by the pressure of the fuel is more than the force of spring (5), valve (9) will lift. When needle valve (9) lifts, fuel under high pressure will go through four orifices (11) into the cylinder. When the fuel is sent to the cylinder, the force made by the pressure of the fuel in the nozzle body will become less. The force of spring (5) will then be more than the force of the pressure of the fuel in the nozzle body. Valve (9) will move quickly to the closed position.Needle valve (9) is a close fit with the inside of the nozzle and makes a positive seal for the valve.When the fuel is sent to the cylinder, a small quantity of fuel will leak by the valve guide. This fuel gives lubrication to the moving parts of the fuel injection nozzle. This fuel then goes through a leakoff passage in body (6) to outlet (1) and is returned to the fuel tank.Cooling System
Basic Cooling System Schematic
(1) Pressure cap. (2) Upper hose. (3) Water temperature regulator (thermostat) housing. (4) Radiator. (5) Cylinder head. (6) Water pump. (7) Cylinder block. (8) Lower hose.The cooling system is the type with a radiator that will keep the engine cool with a water to air transfer (movement of the heat from water to the air). Water pump (6) is mounted on the front of cylinder block (7) and is driven by a V-belt from the crankshaft pulley. The inlet opening of the water pump is connected to lower hose (8). The outlet flow from the water pump goes through passages inside the cylinder block.The coolant from the water pump through the