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How to learn more Gasoline pump damage and repair methods
First, the causes of damage to the fuel pump EFI engine fuel delivery is installed in the gasoline tank by the electric pump with pressure adsorption, its motor is also partially immersed in gasoline, gasoline from it to work in the high temperature cooling, in view of The working principle of it is easy to damage the principle is as follows: 1, the long-term fuel lamp alarm is not timely refueling, causing the motor part of the non-gasoline cooling, burn the motor and suction Fu diaphragm; 2, dirty gasoline block straw and diaphragm; 3, the most crucial point, some owners long open the electric fire switch, the engine does not fire, sitting in the car to listen to sound and talk, because the circuit connected to the gas pump to start work and can not release the pressure burned motor and diaphragm pressure drop or burn Die, I know, as long as the domestic brand is a manufacturer of gasoline Pumps are reliable quality, such as your pump damaged several times, please take a look at their own habits are good. Second, the overhaul of the petrol pump 1, overhaul of the petrol pump housing (1) Check the flatness error of the combination plane of the upper and lower shell of the petrol pump, the flat is usually placed on the flat with a combination of thickness gauge measurement Flatness error should not exceed 0 · 10mm. If the ultra poor, will result in gas leakage, oil leakage, the impact of gasoline pump out of the oil pressure and the oil. Therefore, if more than the required requirements, fine sand cloth can be placed on the flat grinding. (2) The combined plane of the housing and the cylinder block, the flatness error should not be greater than O.20mm. Inspection and repair methods are the same as above. (3) Check the rocker arm axial clearance on the rocker shaft, with a thickness gauge inserted between the rocker arm and the shell to measure, the gap should not exceed 0.80mm. If more than the required requirements, both sides of the rocker arm pad with the same thickness. (4) shell cracks or gaps, should be replaced or bonded with epoxy glue. If there is damage on the threaded hole in the shell, replace the shell or repair the screw hole. 2, the arm of the maintenance Petrol pump rocker arm in contact with the eccentric surface, wear will cause the work schedule to shorten the diaphragm to reduce pump oil. Rocker arm wear if more than 0.2Omm, should be surfacing. After welding press trimming, surface roughness Ra value should not exceed 2.5μm. Radial arm and rocker arm radial clearance should not exceed 0.1Omm. There should be no gap between the rocker arm shaft and the housing bearing hole. If the former exceeds the specified requirements or the latter appears gap, reaming, replacement with larger size rocker shaft. 3, into the valve overhaul into, out of the valve due to wear or corrosion of gasoline acid, by the deposition of plastic and other dirt to make it closed lax, affecting the amount of oil and oil pressure, oil valve Damage should be replaced. 4, diaphragm and diaphragm spring diaphragm rupture, hardening deterioration, should be replaced. Diaphragm spring long-term use, weakened elasticity. Therefore, when the engine overhaul to check its free length and performance. Require diaphragm spring should have enough tension, lack of tension or rust phenomenon, should be replaced with new products. 5, the performance test of the petrol pump petrol pump fitted, the performance test should be carried out, the best in a special test bench. Gasoline pump test installation size should be consistent with the actual installation of gasoline pumps on the engine requirements. When the specified speed of the eccentric drive gasoline pump, the technical requirements should be consistent with technical regulations. When the pressure is reached, stop the pump oil lmin, during this time the pressure drop shall not exceed 2.66kPa, the joint surface may not have oil leakage within 3min. In the absence of a dedicated test bench, the experience can also be used test method: When the mouth into the mouth can suck the tongue; Out of the mouth, blowing can not move, said the out of the valve seal is good. The inlet into the water or gasoline immersed, hand-rocker arm, the oil out of a hurry and strong and no folder bubble, said gasoline pump performance is good. Otherwise, replace the pump.