Kobelco excavator engine PT fuel injection pump to explain:
Kobelco excavator engine Cummins N and NH, K and other series of engines are used PT, injection system, the system has two types: one is the PT-G type pump, governor controller, and the two is the PT-R pump pressure adjustment type.
The main features of the PT pump injection system are:
The PT injection system is used in the injection pump and the injector fuel system. The high pressure, timing distribution and oil quantity regulation are carried out in the injection pump and the injector, and the fuel injection into the injector is only about 20% from the injector to the human combustion chamber. The remaining fuel is cooled and lubricated after the injector is cooled and lubricated. The fuel system is fired in the PT fuel system. The oil pump only outputs low pressure oil and no high-pressure oil pipe, there is no pressure wave at high speed, and the fuel injector plunger down speed is fast and the size of the jet hole is small, so the maximum injection pressure can reach lOOMPa, which is beneficial to the fuel atomization, full combustion and good economy. When the engine is stopped, the oil flow is shut off to cut off the oil flow. Move.
Professional adjustment of PT fuel injection pump for Kobelco excavator engine adjustment of nozzle pressure on cylinder head:
The pressure of the injector plunger can not be too large or too small: excessive pressure will cause the injector to deform the machine parts; the pressure is too small. The pressure is too small. The pressure is too small and the residual fuel of the plunger and the cone head cavity is sintered at the end of the injection, making the head overheated and leading to the head off of the head. Therefore, the installation of the injector must be adjusted.
1 the torque adjustment method tightens the injector adjusting screw to the specified torque to ensure the piston pressure on the cylinder head.
The calibrated timing mark makes the cylinder in the state of decompression, rotating the timing pulley according to the rotation direction of the crankshaft, aligning the timing mark on the wheel with the mark on the gear chamber cover. The pulley mark TC indicates the position of the piston at the top stop, and VS indicates that the number of the piston at the 90 degrees after the top stop is the corresponding cylinder number before the.TC and the VS mark. After that, the compressed cylinder is determined according to the intake and exhaust valve status. Only one cylinder can be adjusted for a single mark.
The locking nut on the rocker arm of the injector is loosened when the cold car is adjusted, and the screw is screwed to the plunger down. The lower end of the plunger is in contact with the cone seat of the cylinder and then the screw is screwed 15 degrees, and the residual fuel in the cylinder head is squeezed. Then the adjusting screw is loosened and the torque wrench is tightened to the specified torque, and the screw position is used to keep the screw position adjusted. Do not move, lock the nut tightly at the specified torque.
After rechecking all fuel injectors are adjusted, start the engine at medium and low speed. When the oil temperature reaches 60 degrees C, check again.
The 2 stroke adjustment method uses the dial indicator and the rocker arm to adjust the plunger of the fuel injector to the specified value.
The dial bracket is fixed to the cylinder head and the meter's pole is vertically mounted on the flange face on the injector plunger. When the plunger is at the lowest position in contact with the cylinder head, the dial readings are adjusted to zero. The crankshaft is rotated in the direction of the engine to make the plunger up to the highest position, and the percentage meter reads the stroke of the plunger, such as not. Meet the requirements, adjust the adjusting screws on the rocker arm to meet the requirements.
