This article will describe five things that should be paid attention to in the daily maintenance of diesel pump for reference only.
1. Select qualified diesel filter
Generally speaking, diesel engines have much higher requirements for diesel filtration. In application, diesel of the required brand shall be selected and precipitated for at least 48 hours. Strengthen the cleaning and maintenance of diesel filter, and timely clean or replace the filter element; Clean the diesel tank timely according to the operating environmental conditions, and thoroughly remove the oil sludge and moisture at the bottom of the tank. Any impurities in the diesel will cause serious corrosion or wear to the plunger of the fuel injection pump, outlet valve coupling and transmission components.
2. Always check whether the oil quantity in the oil tank of diesel engine fuel injection pump is at the specified position, and add it if it is insufficient
Before starting the diesel engine every time, check the quantity and quality of the oil in the fuel injection pump to ensure that the oil quantity is sufficient and the quality is good. If the oil deteriorates due to mixing water or diesel, the light will cause the early wear of the plunger and oil outlet valve coupling, resulting in insufficient diesel power and difficult startup. In serious cases, it will cause the corrosion of the plunger and oil outlet valve coupling. Due to the internal leakage of the oil pump, the poor operation of the oil outlet valve, the wear of the tappet and shell of the oil transfer pump and the damage of the sealing ring, the diesel oil will leak into the oil pool and dilute the oil. Therefore, it shall be replaced in time according to the quality of the oil. During the replacement, the oil pool shall be thoroughly cleaned and the oil sludge and other impurities at the bottom of the oil pool shall be removed, otherwise the oil will deteriorate after application for a short time. The number of engine oil shall not be too much or too little. Too much oil filling in the governor will easily lead to too high speed of the diesel engine. Too little oil filling will lead to poor lubrication. The oil dipstick or oil plane screw shall prevail. In addition, when the diesel engine is not used for a long time, it is necessary to check whether there are water, diesel and other impurities in the engine oil in the oil pool of the oil pump. If so, it shall be replaced immediately, otherwise, due to long-term storage, the water is very easy to rust and block the plunger and oil outlet valve and scrap them.
3. Regularly check the fuel supply advance angle of diesel engine fuel injection pump and whether the fuel supply advance angle of each cylinder meets the specified requirements
In application, due to the looseness of coupling connecting bolts and the wear of camshaft and roller body parts, the oil supply advance angle and oil supply interval angle of each cylinder often change, so that the diesel combustion deteriorates, the power and economy of the diesel engine deteriorates, and it is difficult to start, unstable operation, abnormal noise and overheating, etc. In practical application, most drivers pay attention to the inspection and adjustment of the overall fuel supply advance angle, but neglect the inspection and adjustment of the fuel supply interval angle. After the overall adjustment, although the fuel supply timing of the first cylinder is correct, the fuel supply timing of the other cylinders is not necessarily due to the wear of camshaft and roller transmission parts, which will also lead to difficult starting, insufficient power and unstable operation of the diesel engine, Especially for the fuel injection pump which has been used for a long time, we should pay more attention to the inspection and adjustment of the fuel supply interval angle.
4. Regularly check the fuel supply of each cylinder of diesel engine fuel injection pump
Due to the wear of plunger coupling and oil outlet valve coupling, diesel internal leakage will reduce or uneven oil supply of each cylinder, resulting in difficult starting, insufficient power, increased fuel consumption and unstable operation of diesel engine. Therefore, regularly check and adjust the fuel supply of each cylinder of the fuel injection pump to ensure the application of diesel engine power. In practical application, the fuel supply of each cylinder can be determined by observing the exhaust gas of the diesel engine, listening to the engine sound, touching the exhaust manifold temperature and so on.
5. Check camshaft clearance regularly
The axial clearance of the camshaft of the fuel injection pump is very strict, generally between 0.03 ~ 0.15mm. If the clearance is too large, it will aggravate the impact of the roller transmission parts on the working surface of the cam, so as to increase the early wear of the cam surface and change the oil supply advance angle; The clearance between camshaft bearing and shaft diameter is too large, which is easy to cause unstable operation of camshaft, jitter of oil regulation pull rod, periodic change of oil supply, and unstable operation of diesel engine. Therefore, regular inspection and adjustment shall be carried out. When the axial clearance of camshaft is too large, shims can be adjusted on both sides. If the radial clearance is too large, it is generally necessary to replace it with a new one.
