The test of the fuel injection pump and governor assembly of the silent generator set should be conducted on a dedicated test bench. The diesel used for the test is grade 0 or grade 10 light diesel, which must be filtered or precipitated. Before testing, inject engine oil into the injection pump and governor of the silent generator set to the specified oil level, connect the return oil pipe, low-pressure oil pipe, and high-pressure oil pipe, loosen the vent screw on the pump body of the silent generator set, start the test bench, exhaust the air from the injection pump of the silent generator set, tighten the vent screw, and then rotate the test bench speed to the rated speed for 15 minutes. There is no oil leakage at all joints, and the moving parts should operate.
Observe the instantaneous fluctuations of the oil at the return nozzle orifice plate and orifice plate of the standard fuel injector connected to the first cylinder of the silent generator set fuel injection pump. Stop the rotation of the silent generator set and record the reading of the test bench dial. Based on the first cylinder, use the same method to determine the starting time of the silent generator set cylinder and the angle between the first cylinder. The deviation from the specified angle should not exceed (+30 '), otherwise the height of the roller body should be adjusted. After adjustment, the gap between the plunger of the silent generator set and the top surface of the oil outlet valve should be 0.4-1mm. Insert a thickness gauge into the drum body and measure the time between the screw of the silent generator set and the bottom surface of the plunger.
Use a small screwdriver to loosen the locking screw on the gear of the adjustment mute generator set, insert the fine iron rod of the mute generator set into the small hole and lightly tap the oil control sleeve to change the relative position of the adjustment mute generator set gear and the oil control sleeve. If there is too much fuel in the auxiliary pump, turn left. If there is too little fuel, turn right. Adjust the silent generator set and tighten the locking screw. Adjust the governor of the silent generator set to stop the oil supply speed, fix the control handle of the silent generator set at the calibrated speed position, make the high-speed stop screw of the silent generator set contact the control handle, make the regulating gear rod of the silent generator set fuel injection pump collide with the fuel limit screw, and then slowly increase the speed from the camshaft of the silent generator set fuel injection pump to the fuel injector.
Check and adjust the stability of the governor speed, fix the handle of the silent generator set at the calibrated speed position, and gradually increase the camshaft speed. When the oil supply to the fuel injection pump of the silent generator set begins to decrease, the camshaft speed should be immediately kept constant, and then the gear and gear rod should be carefully observed and adjusted to ensure that there is no movement. When the camshaft speed of the silent generator set is 400r/min, 250r/min or other speeds, the position of the control handle should be changed. The gear of the silent generator set should be checked and adjusted, and the gear lever should be adjusted to prevent it from moving. When the diesel engine of the silent generator set is unstable at low speed, the low speed stabilizer can be slowly turned on until the speed stabilizes before fixing. Only after disassembly and decoration can adjustments be made, and it should be noted that the low-speed stabilizer should not be tightened too much to avoid excessively high minimum stable speed.
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