Debugging Method of
Fuel Injection Pump and Its Plunger Maintenance
The fuel
Injection Pump is an important part of the diesel engine and is regarded as the "heart" part of the diesel engine. Once it fails, the entire diesel engine will malfunction. The first thing to do is to debug the oil supply time. Remove all the oil outlet pipe joints, turn the dial to make the oil outlet of cylinder 1 start to emit oil, align the scale with an integer scale as the 0 scale, and turn the dial according to the working order. Observe whether the oil supply interval angle of each cylinder is 60 degrees, and the deviation is within 0.5 degrees.
Start the test bench, set the speed at 200rpm, set the number of fuel injections at 200 times, turn the control arm to the maximum fuel supply position, and press the counting button. The standard fuel injection volume should be 26ml. If the fuel injection volume is abnormal, the position of each cylinder's shift fork on the fuel supply rod can be adjusted separately. In addition to setting the speed at 900rpm, the standard fuel injection volume should still be 26ml. If the fuel injection volume is abnormal, it can be adjusted uniformly by adjusting the rated speed fuel volume adjustment screw.
The debugging method of the idle fuel supply of the fuel injection pump is to start the test bench, set the speed at 250rpm, set the number of fuel injections at 200 times, and press the counting button. The standard fuel injection volume should be 6ml. If the fuel injection volume is abnormal, it can be adjusted uniformly by adjusting the idle fuel volume adjustment screw.
The worn part of the fuel injection pump plunger is usually at the top. If the surface is dark or worn, it should be replaced. After testing, it is found that the plunger is slightly stuck, so it is necessary to pull out the plunger, wipe off the diesel oil on it, and carefully observe it under a magnifying glass. Find the traces of bumping and roughening, especially at the edges and corners of the matching cylinder, and carefully repair the plucking corners with an oil stone with a particle size of 800 or more.
