How to Maintain The Fuel Injection Pump? (2)

Brief introduction

In the article named how to maintain the fuel injection pump (1), we have talked about the importance of the fuel injection pump and fuel injection pump types. Here we still focus on how to maintain the fuel injection pump.

How to maintain the fuel injection pump?

Using standard high pressure tubing

During the oil supply process of the fuel injection pump, due to the compressibility of diesel and the elasticity of the high-pressure oil pipe, the high-pressure diesel will form pressure fluctuations in the pipe, and it takes a certain time for the pressure wave to transmit in the pipe. Even, the diesel engine works smoothly, and the length and diameter of the high-pressure oil pipe are selected through calculation. Therefore, when the high-pressure oil pipe of a certain cylinder is damaged, it should be replaced with a standard length and diameter oil pipe. In fact, due to the lack of standard oil pipes, other oil pipes are used instead, regardless of whether the length and diameter of the oil pipes are the same, so the length and diameter of the oil pipes vary greatly. The quantity changes, resulting in the unstable operation of the whole machine, so the standard high-pressure oil pipe must be used.

Ensuring high cleanliness of diesel fuel

Generally speaking, the filter requirements of diesel generators for diesel oil are much higher than those of gasoline engines for gasoline. When using it, you should choose diesel oil that meets the required grades, strengthen the cleaning and maintenance of diesel filters, and clean or replace the filter elements in time. Clean the diesel tank in time according to the working environment conditions to completely remove the sludge and water at the bottom of the fuel tank. Any impurities in the diesel will cause serious corrosion or wear to the plunger of the fuel injection pump, the coupling parts of the fuel delivery valve and the transmission parts.

Checking the camshaft clearance regularly

The axial clearance of camshafts of the fuel injection pump is very strict, generally between 0.03 and 0.15mm. If the clearance is too large, the impact of the roller transmission parts on the working surface of the cam will be aggravated, thereby increasing the early wear of the cam surface and changing the oi supply advance angle. When the axial clearance of the camshaft is too large, it can be adjusted by adding gaskets on both sides. If the radial clearance is too large, it is generally necessary to replace it.

Checking the sealing condition of the valve couple regularly

After the fuel injection pump has been working for a period of time, by checking the sealing condition of the oil outlet valve, a rough judgment can be made on the wear of the plunger and the working condition of the oil pump, so as to determine the repair and maintenance methods. When checking, unscrew the high-pressure oil pipe joints of each cylinder, and use the oil delivery pump to pump oil from the oil pump. If oil flows out of the oil pipe joint on the top of the fuel injection pump, it means that the oil outlet valve is not well sealed (this will also happen if the oil outlet valve spring is broken). If there is poor sealing of multiple cylinders, the fuel injection pump should be thoroughly debugged and the valve couple should be replaced.