Debugging of VE Distribution Pump for Diesel Generator 1

The preparation work before debugging the VE distribution pump of the diesel generator includes: installing the VE pump on the test bench and injecting diesel with a pressure of 0.035MPa into the inlet pipe joint; Install a pressure gauge with a range of O~1. OMPa between the return pipe joint and the pump body, and connect the return pipe; Connect the high-pressure oil pipe and fuel injector, with a specification of 6 for the high-pressure oil pipe × 2mm, the length of the first and third cylinders is 420mm, and the length of the second and fourth cylinders is 430mm. The injection pressure of the standard fuel injector is (17.2 ± 0.3) MPa, and the diameter of the throttle hole is 0.4mm. The test oil temperature is 38-42 ℃. Additionally, the solenoid valve is powered on with a 10-12V power supply. The debugging requirements for the VE distribution pump of the diesel generator are as follows:

1. Inspection and debugging of pre stroke: The specified pre stroke (from bottom dead center) of the VE4/l1Fl900R294 fuel injection pump is (O ± 0.02) mm. During inspection, install a transparent drain pipe on the screw hole of the plug at the upper end of the fuel injection pump, slowly rotate the drive shaft of the fuel injection pump, so that the oil just flows into the drain pipe, but does not flow out of the drain pipe. Then, remove the oil pipe and replace it with a dial gauge to measure the position of the fuel injection pump plunger and record the reading. Rotate the drive shaft of the fuel injection pump so that the plunger is at the bottom dead center, which is the left limit position. Measure the position of the fuel injection pump plunger using a dial gauge and record the reading. The difference between the two readings is the pre stroke. If the pre travel does not meet the specified value, adjust it with the adjusting gasket of the plunger. If replacing the plunger gasket, the pre stroke should also be inspected and adjusted according to the above method.

2. Adjustment of the internal chamber pressure of the fuel injection pump: Adjust the speed of the diesel generator VE pump to 1500r/min, and when the intake pressure of the LDA device is 0.1MPa, the internal chamber pressure should be 0.6~0.66MPa. If the specified value is not met, the pressure regulating spring seat of the pressure regulating valve in the VE pump can be adjusted. At the same time, check whether the pressure inside the VE pump of the diesel generator also meets the corresponding requirements at other specified speeds.

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