Mechanical Injection pump Conventional (VE) Type Injection Pump System Construction Altitude Compensator Fly weight Governor Full load adjusting screw Control lever Fuel cut solenoid valve Drive disc Plunger spring Timer Control Injection Presser 110~140 bar In traditional diesel engines the pump is driven by the engine, and it’s function is to each injector and to regulate there opening to control engine speed Injection amount to control engine speed are controlled by mechanical or electrical governor system located inside of injection pump, it controlled by accelerator pedal with cable or wiring (in case of electric governor system Governor System Governor & Fuel control system Governor spring Fly weight Control lever Idling spring Full load adjusting screw Tension lever Regulating Valve Fuel cut solenoid valve Out let Drive shaft Feed pump ( 90˚ turned) Gear Drive disc Delivery valve Control sleeve Plunger spring Cam Disc Plunger operation How to control The Pressure is generated by a plunger Plungers are driven by Drive disc cams 10 Fuel Control Minimum injection Half injection Full injection Governor system Governor spring Mechanical type Injection Pump Fly weight Idling spring Full load adjusting screw Control lever Tension lever Regulating Valve Fuel cut solenoid valve Out let Drive shaft Feed pump ( 90˚ turned) Delivery valve Control sleeve Gear Plunger spring Drive disc Injection amount to control engine speed are controlled by mechanical governor system located inside of injection pump, it controlled by accelerator pedal with cable Cam Disc Fuel control by control lever Governor spring 1) Fuel control by control lever Fly weight Idling spring Full load adjusting screw Control lever Tension lever Fuel cut solenoid valve Regulating Valve Out let Drive shaft Feed pump ( 90˚ turned) Delivery valve Control sleeve Gear Plunger spring Drive disc Cam Disc The amount of injections are changed by position of control sleeve, it is controlled by fuel control lever through the tension lever Fuel control by Governor Governor spring 2) Fuel control by Governor Fly weight Idling spring Full load adjusting screw Control lever Tension lever Fuel cut solenoid valve Regulating Valve #2 Governor Out let Drive shaft Feed pump ( 90˚ turned) Delivery valve Control sleeve Gear Plunger spring Drive disc Cam Disc When the engine rpm is over the limit, the Fly weights are expended by centrifugal force and tension lever is moved back by push load than the control sleeves are moved back too, so fuel injection amount are decreased so it’s make reduce the engine rpm Q Compensation Resistance Q Comp Measured Number Resistance Resistance No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10 No.11 No.12 No.13 945 946 947 948 949 950 951 952 953 954 955 956 957 0.18(kΩ) 0.3(kΩ) 0.43(kΩ) 0.62(kΩ) 0.82(kΩ) 1.1(kΩ) 1.15(kΩ) 2(kΩ) 2.7(kΩ) 3.9(kΩ) 5.6(kΩ) 8.2(kΩ) 15(kΩ) □ Resistance Reset : - With Hi-Scan Pro DTC Erasing - Short pin to pin in ECM CSP Symptoms : FT(Fuel Temperature) Sensor Symptoms : ECT Sensor Symptoms : BPS with IAT Symptoms : CKP Symptoms : Fuel Cut Valve Symptoms : EGR Symptoms : Prohibitive Condition : EGR- Stage No Works Duty Normal Operation EGR- Stage On/Off Duty Sudden Acceleration or Sudden Deceleration Current Data Current Data Current Data Actuation Test Actuation Test