13 1 O. Injection Pump Drive 1 Pump drive case
2 Bearing 3 Pump drive gear 4 Pump drive shaft 5 Coupling
A: Timing gear side B: Timer side
A
The injection pump drive is fitted onto the flywheel housing on the left of the engine. It is driven by the engine timing gear at half the engine speed. The pump drive shaft 4 drives the injection pump via the cou pling 5 on its timer side.
5
11. Injection Nozzle <1-spring type> 1 Nozzle spring 2 Needle valve
3 Nozzle 4 Adjusting screw 5 Nozzle holder
�B
A: To leak-off pipe
B: From injection pump
Fuel fed from the injection pump enters the nozzle holder 5. When the fuel pressure in the nozzle holder exceeds a preset pressure, it overcomes the nozzle spring 1, pushes up the needle valve 2, and the fuel is sprayed into the cylinder from the orifice at the end of the nozzle 3. Some of the high-pressure fuel lubricates the needle valve 2 and returns to the fuel tank via the leak-off pipe.
04538
13A-15