Chang 'an Star 637 1 Engine has changed the intake throttle. What is the reason why it can fly?

Generally speaking, the occurrence of runaway is caused by the damage of governor or the failure of oil inlet and return circuit. Generally speaking, there are: 1, too much lubricating oil is added to the governor shell, which affects the speed regulation; Governor friction clutch slips; The governor high-speed limit screw and safety clamp are loose; Come out quickly or it will get stuck; The governor spring is broken, and the thrust bearing or governor bearing is damaged, which makes the governor fail and causes runaway. 2. The sliding sleeve of the governor of single-cylinder diesel engine with single fuel injection pump is stuck, which leads to the speed regulation failure and out of control.

3. The plunger coupling of the fuel injection pump can't rotate because it is installed askew or stuck by oil pollution, which will reduce the load, can't change the oil supply and cause runaway.

4. The oil regulating teeth of the fuel injection pump are stuck at the maximum oil supply position or the rack is out of control from the governor pull rod, resulting in out of control.

5. The oil return hole is blocked, resulting in poor oil return, which leads to a surge in oil supply and overspeed.