Speed is the diesel engine is in the process of operation, especially in small and medium-sized load in the course of operation, for some reason the engine speed surge, speeding and running can not be controlled, run the exhaust smoke, sound and vibration of the phenomenon. Automobile Maintenance Network

     In "Speed", with the increased speed diesel engine, fuel pump and piston plunger suites reduce leakage into the cylinder diesel increase, leading to the engine speed to increase, thus forming a vicious cycle. The continuous increase of diesel engine speed so that the cylinder temperature rising, the expansion increased the Pistons, the Pistons link groups of parts movement intensified, increased load, more than its ultimate strength, will occur damaged cylinder, the link pack Broken, broken crankshaft and piston, cylinder and cylinder head were broken, and other serious accidents. Therefore, the diesel engine in case of "Speed" and must take measures to reduce the "Speed" time to reduce losses.

     First, the "Speed" Analysis

     Practice has proved that a lot, cause engine "Speed" First, the main fuel pump failure governor, two are involved in extra fuel into the combustion chamber.

     1, fuel pump governor Analysis

     Under normal circumstances, when the engine load changes, the governor can automatically adjust the supply of fuel pump, its speed to maintain stability and vice versa, when the engine load changes, the supply of fuel pump can not respond, that is, Will happen, "Speed." With the supply of fuel pump can not load due to a change: B-tooth-conditioning or fuel pump, fuel pump Ⅱ the regulation of drawbars card died in the largest volume of oil supply position; fuel pump plunger to spring break-Fonseca In high-speed position; plunger adjustment ring gear or loose Bocha plunger to shift out of control; tooth-and oil-conditioning governor drawbars connection loss; governor lever pin loss; governor-iron pin fracture , Iron-shedding; pressure on the iron-bearing damage governor spring break or elastic weakened; governor added too much oil, oil viscosity too much; governor of the largest high-speed limit screw or screw adjustment of fuel restrictions Improper.

     2, additional fuel into the combustion chamber for analysis

     Additional fuel into the cylinders of the main ways:

     Too much oil in the engine oil pan, cylinder and piston ring wear a very, oil Cuanru cylinder; inertia oil bath air filter, washing after washing the residual oil or add too much oil, inhalation chamber ; Turbocharged diesel engine oil seal damage to the supercharger, oil into the combustion chamber; cold starting device of the electromagnetic valve leakage of diesel, to enter the cylinder.

     Second, the "Speed" after the emergency measures

     As mentioned above, Diesel in "Speed", must immediately take urgent measures to stop, otherwise, it will seriously damage the engine, or even lead to major accidents. Suppression of "Speed" the main method:

     1, the speed governor will handle (the pedal) do not put oil supply position;

     2, oil supply tension bar or teeth-can quickly exposed the fuel pump will not return to the oil-pull position;

     3, the rapid decompression device will be placed in decompression handle decompression position;

     4, the inlet valve with the valve will be closed quickly, without the valve cover air filter can be removed by clothing or other items to block the inlet;

     5, a mechanical transmission (using hydraulic mechanical transmission of the mechanical vehicles, locking the clutch will clutch lock) the machinery linked to high-end vehicles in time,踩下brake pedal, clutch pedal-ease, forced off the diesel engine;

     6, the speedy pinch-high-pressure pipeline joints or the low-pressure injection pump into the pipeline joints and no wrenches, may also have Zaduan pipeline emergency measures.

     "Speed" to stop, must seriously find out the reasons, if necessary, respond to major campaign to inspect parts and found the problem completely rule out the possibility to prevent the "Speed" incidents from happening again, and ensure the safe operation of diesel engines.