|
|
© 200324 2-5 General XE ENGINE FUEL SYSTEM CF65/75/85 series 4 8 The valve (6), back plate (8) and the pump plunger (13) are located in the top of the pump unit. These parts are lubricated by the fuel. A roller (17), tappet (15) and a spring (14) with spring retainer (16) are situated on the bottom of the pump unit. These parts are lubricated by the engine lubrication system. The lower sealing ring on the pump unit separates the fuel system from the engine lubrication system. A pressure valve (5) is fitted on the top of the pump unit. The function of the pressure valve is to prevent the supply section from being interrupted by pressure peaks from the injector pipe. The injection timing and the quantity of fuel to be injected are controlled by a solenoid valve (9) that consists of an electromagnet and valve (6) with back plate (8), via the electronic unit control. If the solenoid valve (9) is not energised, the valve (6) is forced against the valve stop (4) by the force of the valve spring. This creates a very small opening between the space above the pump plunger (13) and the supply ducts (2). 1 15 17 3 4 6 7 8 10 2 11 12 13 14 16 9 i 400434 5 |