TUBE ASSEM. 1J0101 - Caterpillar

The 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 and the fuel injection pump flows through fuel return line (7), through the injectors in the ARD and back to the fuel tank (1). 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 by the electric fuel priming pump 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.In order to release air from the fuel injection pump and the fuel injection nozzles, refer to Systems Operation, Testing, and Adjusting, "Fuel System - Prime".Governor
The fuel rack is connected to the linkage, which controls the fuel injection pump. This linkage is located in the front housing.These engines have a mechanical governor in order to control engine speed. The governor operates for all engine rpm. 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 front housing.
Illustration 3 g03335322
Typical example of the governor control mechanism in the front housing
(1) Connection for the linkage to the fuel injection pump
(2) Control lever
(3) Lever return spring
(4) Governor adjustment screw
(5) ArmThe movement of the governor weight assembly is transferred to the fuel rack on the fuel injection pump by the control lever (2), the governor lever (5), and the linkage to the fuel injection pump. The governor main spring (3) connects the governor lever to the control lever. The governor main spring controls the movement of the governor weight assembly on the camshaft. When the angle of the control lever changes, the tension on the governor main spring changes. This action controls the linkage to the fuel rack on the fuel injection pump, which controls the engine rpm.The maximum fuel adjustment screw is mounted in the front housing. The maximum fuel adjustment screw is set to the full fuel position. This limits the maximum fuel that can be injected into the engine in case the fuel rack solenoid