VE-type rotor pump with small size, high speed, light weight, uniform fuel supply, low noise and other characteristics of the diesel engine has been widely used, but it also exists due to high precision, easy plug piston stagnation and other shortcomings.
1 common fault phenomenon
1) No oil, the fuel injector does not oil.
2) unstable speed, diesel jitter.
3) There is air in the pump.
4) a small amount of fuel.
2. Analysis of the reasons
1) Injector does not inject oil â‘ Injecting pressure is too low: the general adjustment error or nozzle clogging.
â‘¡ supply pressure is too low: in most cases due to serious wear and tear of the plunger or pump failure, low-pressure oil wall plug, oil tank and other causes. High-pressure tubing over tightened to store a torque, when the diesel engine work, the temperature rise or vibration so that the torsion rebound, the valve loosening, but also can cause hydraulic pressure drop.
2) Unstable rotational speed â‘ In diesel engines with VE type rotor pump, the speed of spike is usually lower than that of spike. If abnormal phenomenon occurs, check whether the injector is invalid and then check whether the outlet valve of one cylinder is loose.
â‘¡ low idle speed may also cause diesel jitter, diesel oil in the air or valve failure may also result in instability.
3) There is air in the pump â‘ Low pressure oil air.
â‘¡ drive shaft seal failure.
4) small amount of oil â‘ improper adjustment: a new piston after a period of time, failure faster, therefore, the assembly of the new plunger fuel pump calibration in the oil supply should be raised 0.5min / 100 times.
â‘¡ plunger wear: plunger serious wear and tear phenomenon is no idle, high speed does not drop, down need to pull down the handle, commonly known as false car.
3. FAULT EXAMPLE Rotor pump air inside the pump is a typical VE failure. Check the low-pressure oil are normal, but there is always some diesel engine work there is air, there are several times there are more than a dozen kilometers of car walking, a sudden burst of gas pump oil squeezed clean. Then pump oil, walking a dozen kilometers, this situation appears again. The tank rack high, plus electric oil pump does not work. After the analysis, that is, the gas inside the crankcase into the oil seal from the drive shaft of the pump into the oil seal replacement after the normal.
In addition, the accelerator lever is VE pump easier to wear place, often wear and leak at this place.
VE pump more sophisticated, the fuel requirements are relatively high, therefore, to extend the working life of the fuel pump, the use of precipitation should be better quality diesel.
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