| Distribution of VE-type fuel injection pump column Fonseca Cause Analysis and Solution |
VE pump plunger, the role of work have both assigned the role of oil pressure, rotation speed 1000-2000r/minm, each revolution of the pump oil 4-6 times, with the gap only 3nm, slightly non- Shen, easily stuck. Location is usually stuck in two parts. One is stuck between the plunger and the sleeve. At this point the plunger is likely to be broken, the engine turns off, can no longer start No oil from the pump with spray head, fuel door and no response. Second, the drain plunger and stuck between the rings. Drain work only in the piston ring sliding surface does not rotate, once stuck, rings and columns Cypriot synchronous rotation, the speed control lever assembly on the ball and not allow ring rotation, therefore, under the action of strong rotary torque, ball pushed down, lever assembly to be forced contortion. Death in the cards Moment, the cam pins on the disc may have been cut off. 1, the fuel contaminated the main reason is stuck (1) oil in water or corrosive liquids, mistakenly added to gasoline, low quality Diesel, leading to corrosion, damage to oil film, resulting in stuck. (2) filter failure, small hard particles into the pump lead stuck. (3) The pump do not maintain long-term operation , Since the pump installed in the engine side, often in high temperature, fuel cracking of hydrocarbon compounds into tiny carbon particles, attached to the part wall, over time, and gradually accumulated into tiny Particles, the tiny granules enter the high speed precision motion Vice vacuum pump, is one of the reasons causing stuck. (4) Department of pump rubber buffer block, long subjected to torque for Use, and continue to bear the load, easy to aging, aging and easy peeling off into Suixiao particles, these small granules rotary vane vacuum pump chamber, there are likely to die seca column. 2, transfer Improper operation test when one of the reasons is stuck in the plunger the plunger set of high-speed liquid ring vacuum pump lubrication between their surface and heat, thanks to pump oil in the escape of a small amount of the distribution process Fuel for, once the oil-free escape, cooling and lubrication of the plunger that is not a serious failure that may occur. For example, the commissioning of the solenoid is not powered on, or after the electric power of water power Pump function; Again, stop the oil speed debugging, the test bed for a long time running, a lot of fuel escape from the drain ring, without the oil from the distribution of pore pressure out. In this case, the plunger and sets the table Surface without oil lubrication and cooling, most likely stuck. 3, the heat pump diaphragm pump may be stuck to normal operation, the pumps are generally more heat, this time not so cold water pump encountered, to avoid the pump The first shell contraction caused death seca column. |
