Fuel injection pump repair of several parts: (1) thrust plate, fly ball and fly ball seat thrust plate after long-term use, will be grinding round pit and trench, causing the regulator performance degradation. Flying ball and flying ball seat hole wear, the fly ball will fall from the seat hole into the governor, leading to auto-shut down the diesel engine, start difficulties and other failures. Fix the thrust plate, the thrust plate fixed to the machine tool chuck, turning the knife into a 45 ° angle, the knife holder adjusted to 45 ° angle turning; and water scrub the 45 ° angle of the thrust plate polished surface, required to achieve A certain degree of surface roughness. When assembling, add a 1mm thick washer in front of the 107 bearing to ensure a reasonable clearance between the thrust plate and the fly ball bracket and the transmission swash plate. Repair fly ball and fly ball seat hole, you can use the old 7204 bearing sleeve made of upper and lower tire, gently tap into the seat hole, reducing its seat hole. After shrinking, the fly ball can be flexibly and freely rotated in the seat hole, which can prolong the service life of the thrust plate, the fly ball and the seat hole, and ensure the safety and speed regulation performance of the speed governor. (2) manipulated arm shaft, telescopic shaft, flying hammer centrifugal claw A, B-type fuel pump governor, serious wear and tear of the manipulator arm shaft, retractable shaft rear end, flying hammer centrifugal claws and other pieces, by welding repair method repair. Surfacing repair flying hammer centrifugal pawl, pay special attention to the height and slope of the centrifugal claw, if not meet the requirements, will affect its centrifugal clearance, speed and speed governing performance. Kuangrong excessive wear on bearings, flying hammer pin sets, thrust bearings and stent rollers and other items, can be replaced by new products and processing of new ways to solve. (3) Piston Piston The Piston Piston rod receives the impact from the camshaft eccentric or the fuel supply cam, often causing impact and friction, resulting in serious wear. Often found in the work 1/3 of the piston rod head grinding out of the trench, the depth of 4 ~ 5mm. According to the regulations, the effective working stroke of the piston push rod is about 10mm. When the putter head is severely worn, it can not reach its effective working stroke, reducing the amount of oil delivered, resulting in difficulty in starting the diesel engine and lack of power. Therefore, the piston rod wear too much should be repaired welding to ensure the normal operation of the pump. (4) tappet adjustment screw or washer tappet adjustment screw name Gasket due to prolonged contact with friction, will be pitted, serious, its depth of up to 0.3 ~ 0.5mm, resulting in fuel pump oil supply too late, Seriously affect the performance of diesel engine. Repair, the tappet assembly should be removed, sandwiched in a dedicated vise, and then the vise fixed to the surface grinder or adsorbed on the platform with a magnet grinding until grinding pit so far. Assembly, the adjustment of the screw-type hold, should tappet height value one by one adjustment. For the pad tappet, the first wear can be turned over to continue to use. After the second wear, the polished gasket should be first selected before assembly specifications, the method of increasing or decreasing the gasket to adjust and assembly. Whether it is the use of screws or gasket adjustment, after the installation, must be in the fuel pump test bench to re-check, adjust the fuel supply advance angle of each cylinder, cylinder and cylinder feed advance angle error shall not exceed 1 ° ( 5) fuel supply cam camshaft oil cam wear can take welding repair method. The thickness of the spot welding should be higher than the original height of the cam, and then use flat file grinding, and then stone, water frosted polished, and to achieve a certain degree of surface roughness. Finally, the semicircular arc fixture made in advance is checked to make it meet the requirements. The above is several parts injection pump repair.
