How to Overhaul Diesel Fuel Pump Fragile Parts - Oil Valve Coupler (1) Oil Fragment Parts Easy to Wear Parts (1) Oil Fitting Ports Easy to Wear Parts: Sealing Cone, Pressure Reducing Belt and Guide Cylinder, Among them, the sealing cone Surface and vacuum ring more easily worn. â‘¡ seat easy to wear parts: the sealing cone and guide hole two. (2) the impact of oil valve coupling wear After the sealing of the oil valve coupling parts wear, the sealing performance will be worse. When the fuel injection pump is working, a portion of the diesel oil field in the high-pressure fuel pipe will flow into the plunger sleeve, so that the pressure of the high-pressure diesel oil will be obviously reduced when the fuel supply is stopped. When the fuel injection pump for the second time, diesel from low pressure rise to the corresponding increase in injection pressure, so the injection time lag, while the amount of fuel will be reduced accordingly. Decompression ring wear, resulting in it and read the seat hole with the gap increases, so that the valve in the corresponding supply process of reducing the corresponding lift, reduced pressure effect is relatively reduced, the fuel pump to stop feeding and high pressure The pressure of the remaining diesel oil pipe increases, diesel fuel supply increased. Diesel engine operation will be instability, lack of power, fuel consumption and other failures. (3) Exterior inspection items and sealing test methods The appearance inspection items of the oil delivery valve couple parts are as follows: â‘ The oil pressure relief ring does not allow obvious signs of wear. â‘¡ out of the oil valve sealing cone does not allow significant signs of wear and tear or metal scraping and longitudinal scratches. â‘¢ out of the valve and the valve seat conical surface does not allow significant corrosion phenomenon. (4) the slippery oil valve coupling parts inspection and repair methods â‘ slip test method: the clean oil valve coupling parts vertically placed, and then in the vertical position out of the full width of 1/2 of the oil pan, rotation Release the valve at any angle. If the valve can be free to rely on their own quality to the free seat on the reading, then qualified; if the phenomenon of block in the process of sliding, then regarded as unqualified. â‘¡ repair method: the oil valve coupling cone surface sealant worse, the valve can be sandwiched in the grinding machine, and then seal the oil valve sealing cone coated with a thin layer of abrasive paste, with his hand holding Reading seat and valve close, and then start grinding mill. When there is no grinding machine, it can also be used to grind the moving method.
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