Identifying the degree of wear of three large diesel engine parts

The degree of wear of three precision pairs of parts in a diesel engine's fuel system has a great influence on the starting, power, and economy of the diesel engine. Especially the performance of single-cylinder diesel engines is even more pronounced. Let's talk about how to identify the degree of wear on a single-cylinder diesel engine. Check the wear level of the plunger coupler. In the stopped state, firstly release the high pressure oil tubing from the high pressure pump, remove it from the fuel injector, turn it so that the nozzle end of the nozzle is upward, and tighten the pump end nut. . Open a large throttle, so that the plunger is in a large oil supply position, the crank to stop the injection of oil. Then slowly turn the flywheel so that the oil level at the high pressure oil port just fluctuates and stop immediately. Use the mouth to blow off the nozzle diesel. Make the oil level 1-2 mm below the nozzle. With the hand slowly turning the flywheel, the crankshaft starts to rotate from a standstill, and the speed cannot be fast. At this time, the plunger can continue to press oil, and the nozzle has oil overflow, which means that the plunger coupling is well sealed and can be used continuously. If it is necessary to quickly crank the engine crankshaft or quickly rotate the flywheel in order to spill oil in the next cycle, it means that the pair of piston accessories has been seriously worn and should not be used again. Replace it immediately. Check the wear degree of the outgoing valve coupler. When the oil level in the high pressure oil pipe is 1-2mm lower than the pipe mouth, rotate the flywheel slowly so that the oil level of the high pressure oil pipe port fluctuates. Then the plunger will be in the sleeve. During the effective oil supply stroke, stop immediately. Re-invert the flywheel, if the nozzle oil surface does not move, indicating that the oil valve is sealed and can continue to use. Conversely, if the oil level drops, it means that the sealing surface is leaking oil and it needs to be replaced. The inspection of the degree of wear of the injector removes the injector assembly, installs a high-pressure fuel pipe outside the machine, and cranks the injector to inject fuel. If the injected sound is crisp, the injector oil jet and atomization are normal, indicating the injector Good, can continue to use.

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