How to repair the rapid diesel engine? Where to fix it? What is the cause of speeding?

What is the reason for the runaway of diesel engine and why does it happen? It turns out that the runaway of diesel engine is determined by the combustion mode of engine, while the speed of gasoline engine is controlled by the intake air, that is, what is the reason why the throttle controls the runaway of diesel engine and why does it happen? It turns out that the flight speed of diesel engine is determined by the combustion mode of engine, while the speed of gasoline engine is controlled by intake air, that is, throttle control. If the throttle valve fails, no matter how high the speed of the gasoline engine is, the throttle valve will be fully opened and the speed will reach the bottleneck. What should we do in case of speeding?

The speed of diesel engine is determined by the fuel supply, so there must be a governor, otherwise it will be easy to fly. If the governor is broken, the oil quantity may be much higher than the normal value, and the corresponding air intake will also increase, which will enter a vicious circle and cause out of control.

Diesel engine galloping refers to the failure that the speed of diesel engine is out of control and the speed is getting higher and higher. Speeding will cause serious accidents such as cylinder pestle and broken shaft of diesel engine. Generally, the runaway fault will only occur when the load suddenly disappears or becomes lighter when the diesel engine is just started or working, but it will not occur when working under the load.

The occurrence of runaway is generally 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 in 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.

If the diesel engine fails to stop immediately, it will have serious consequences. Therefore, when the diesel engine cannot be stopped immediately, the emergency measures are as follows:

1. Put the throttle handle in the position where there is no oil supply, turn on the decompression device, so that the cylinder has no compression force, and then you can turn off the engine.

2. Loosen the nut of the high-pressure oil pipe joint with a wrench, so that the diesel engine can stop supplying oil and stall.

3, blocking the intake pipe, the diesel engine can not absorb air, it will turn off.

4. High-grade heavy load can be used when driving, that is, braking will reduce the engine speed, and then turn off the engine. After emergency measures are taken to stall the diesel engine, the runaway fault can be eliminated according to the above principles.