Diesel Distributor Fuel-Injection Pumps VE - Gnarlodious

through a sliding block and a pin so thatpiston movement can be converted torotational movement of the roller ring.Method of operationThe timing-device piston is held in itsinitial position by the timing-device spring(Fig. 3a). During operation, the pressurecontrolvalve regulates the fuel pressureinside the pump so that it is proportionalto engine speed. As a result, the enginespeed-dependentfuel pressure is appliedto the end of the timing-devicepiston opposite to the spring.As from about 300 min –1 , the fuelpressure inside the pump overcomes thespring preload and shifts the timingdevicepiston to the left and with it thesliding block and the pin which engagesin the roller ring (Fig. 3b). The roller ringis rotated by movement of the pin, andthe relative position of the roller ring tothe cam plate changes with the resultthat the rollers lift the rotating cam plateat an earlier moment in time. In otherwords, the roller ring has been rotatedthrough a defined angle with respectto the cam plate and the distributorplunger. Normally, the maximum angleis 12 degrees camshaft (24 degreescrankshaft).Fig. 3Timing device, method of operationa Initial position,b Operating position.1 Pump housing, 2 Roller ring,3 Roller-ring rollers, 4 Pin,5 Passage in timing-device piston,6 Cover, 7 Timing-device piston,8 Sliding block, 9 Timing-device spring.ba987123456InjectiontimingUMK0355Y31