Faults of Injection Pump and Speed Regulator

by Starlight Generator dieselgeneratortech

1) Faults of injection pump and speed regulator

A. When assembling and repairing, impact the plunger, oil outlet valve seat of fuel injection pump, too much tightening torque will cause the deformation of plunger sleeve, impurities entering into the clearance of plunger pair, too thin gasket on the positioning bolt of plunger sleeve or too long bolt, which will cause the plunger of fuel injection pump to rotate inadequately or be stuck in the position of large oil supply;

B. Loosening of fixing screw for adjusting gear ring of fuel injection pump plunger which causes injection pump plunger loss control;

C. The ball head of the plunger adjusting arm or the gear rod adjusting arm of the fuel injection pump does not enter the adjusting fork groove, so that the plunger is in the position of large oil supply;

D. Accelerating pedal pull rod or oil supply adjusting gear rod and the movable part of governor are stuck, and oil quantity adjusting gear rod and speed adjusting pull rod are out of joint;

E. The excessive lubrication oil, too viscous or too dirty in the governor cause the weight of the governor can not be thrown out in time when the speed rises, which causes the pull rod or the gear rod to lose control of the governor;

F. Full speed governor can not be thrown away because of skew of flying ball seat or abrasion of inclined sliding groove of thrust plate transmission plate, which increases the sliding resistance of flying ball;

G. The springs of injectors are too weak or broken, which results in too low injection pressure and excessive fuel consumption in cylinders;

H. Flying ball Pin Shaft of governor broken off and flying ball flying off.

The above reasons make the speed of diesel engine increase, while the "speed characteristic" of plunger fuel injection pump increases the fuel supply with the increase of the speed, which leads to the vicious circle between the speed and the fuel supply, resulting in the occurrence of overspeed accidents.

Starlight Power is diesel generator set manufacturer with more than 40 years experience producing genset. If you are interested, please contact us by email: sales@dieselgeneratortech.com.