6.7 cummins rear main seal housing torque spec

This in turn could lead to possible engine misfire. Dirt contamination could cause rapid part wear and possible plugging of fuel injector nozzle tip holes. Very tight tolerances are used with these parts. This especially includes the fuel injectors, high-pressure fuel lines and fuel injection pump. The pressurized fuel is then supplied to the fuel rail.ĬAUTION: Cleanliness cannot be overemphasized when handling or replacing the fuel system components. The overflow valve regulates how much excess fuel is used for lubrication of the pump and how much is returned to the tank through the drain manifold.įuel entering the injection pump is pressurized to between 300 -1600 bar by three radial pumping chambers. Any fuel that does not enter the injection pump is directed to the overflow valve. When the actuator is opened, the maximum amount of fuel is being supplied to the fuel injection pump. The FPS (Fuel Pressure Sensor) on the fuel rail provides the actual fuel pressure. The ECM controls the amount of fuel that enters the high-pressure pumping chambers by opening and closing the FAC based on a demanded fuel pressure. The FAC is an electronically controlled solenoid valve. Low pressure fuel is then supplied to the FAC (Fuel Control Actuator). Fuel then enters the fuel injection pump. The Fuel Pump/Gear Pump is a low-pressure pump and produce pressures ranging from 551.5 kpa (80 psi) to 1241 kpa (180) psi. Fuel is forced through the fuel filter element and then enters the Fuel Pump/Gear Pump, which is attached to the rear of the fuel injection pump. The Engine Control Module (ECM) controls the fueling and timing of the engine by actuating the injectors.įuel enters the system from the electric fuel transfer (lift) pump, which is attached to the fuel filter assembly.

High pressure fuel is constantly supplied to the injectors by the fuel rail. This high pressure is then accumulated in the fuel rail. The fuel injection pump supplies high pressure to the fuel rail independent of engine speed.

6.7 cummins rear main seal housing torque spec