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Reason Analysis and Treatment of Diesel Fuel Injection
Used diesel engine friends generally know that the nozzle is the diesel fuel supply system, one of three pairs of precision. Its normal life of more than one thousand hours. However, due to improper use, often using hundreds of hours, or even tens of hours of wear and tear stuck. First, the main reason for the nozzle stuck: ①diesel is not clean, there are impurities in the high-pressure tubing, the power out of the needle valve needle pieces of wear and tear, so that the needle and valve parts closed lax, high pressure gas combustion chamber Channeling, burned needle valve couple pieces. In addition, the injector pressure regulating spring, tappet and other parts of the dirt on the injector through the tappet moved to the top of the injector needle, or oil on the road to prevent leakage of cotton rope, lead wire through the high-pressure tubing into the spray Oil, will make the needle valve parts stuck. ② machine temperature is too high cooling poor cooling device, made Tiger Tiger valve stuck. The oil supply time is too late, the waterway too much scale or blockage, pump impeller end wear and tear, long-term engine overload will make the engine overheating. ③ out of valve wear and tear, so that when the injector to stop the fuel drip phenomenon occurs, so that the fuel injection nozzle char coke, stuck stuck. ④ jet pressure is too low, resulting in anti-channeling high pressure gas in the combustion chamber; ⑤ injector installation, the drain gasket or gasket damage, resulting in leakage, causing the injector temperature is too high and stuck. ⑥ parts manufacturing reasons, such as cylinder head injector injector mounting hole with the injector too tight, the needle valve body and cylinder head mounting hole clearance is too small, cylinder head injector mounting hole processing too deep and so on. Second, the nozzle stuck approach: First stuck in the nozzle into the diesel or oil heating, and then remove the cloth, and then hand clamp clamping needle and slowly move the needle The valve is removed from the needle valve body. A small amount of clean oil drops in the needle valve body, so that the needle valve in the needle valve body repeated activities until the needle valve needle body can move freely. Such as needle valve sealing surface burns marks, should be used to grind abrasive paste. When grinding should pay attention to the amount of grinding paste and grinding time. The clean bell valve coupled with the injector, and adjust the injection pressure can be re-used.