Analysis of Starting Failures of Single-cylinder Diesel Engine

If you follow the diesel engine start procedure, you cannot start it more than 3 times in a row, or even take auxiliary measures. For example, heating the water in the water tank, adding oil to the air intake pipe, igniting the air at the air inlet, or cooperating with two people to crank together When starting the diesel engine, it can be considered that the diesel engine has a difficult starting failure. Failure analysis is as follows: First, the failure of the compression system cylinder liner cracks or sand eye leakage; piston ring wear and tear serious wear; piston ring adhesive stuck; piston ring openings overlap; cylinder liner severe wear; cylinder gasket damage; combustion Room insert burning, dislocation or fall off; start spray hole deflection or blockage; substitute parts are not suitable, such as the cylinder pad is too thick, resulting in reduced compression ratio. Second, the failure of the valve body air filter is seriously blocked, the amount of inflation is not enough; exhaust pipe or muffler blocked, exhaust is not smooth; decompression is not completely caused by the rotation is not flexible; valve and valve seat carbon, wear caused by the seal Lax; valve stem stuck in the catheter; gas spring break; valve seat ring loose, fracture; steam shaft interference tappet chassis, so that the valve can not open and close on time; valve clearance adjustment screw slide, loose and so on. Third, the fuel supply system failure Oil pipeline blockage does not supply oil; There are air or water in the oil; fuel type is not right; fuel injection pump is small, the throttle does not open at low speed; injection pressure is high or low; injector Spring break; oil pump plunger wear; speed adjustment lever fork foot is too low to touch the pump body, or too high to fit the plunger of the fuel pump plunger; dirt between the plunger pair and the outlet valve sealing surface; The spring breaks; the injector shaft pin is stuck; the injector nozzle is blocked, burned, the steel ball is lost; the seal surface of the injector body is damaged; the timing pump gear is installed incorrectly. Fourth, speed control system failure Sliding disc governor steel ball off or missing equipment; steel ball slide stuck out; governor spring or adjusting screw loose; flyweight fly governor flying block and pin off; The flying block and the flying block are stuck; the governor shaft bumps and bends, and the reciprocating motion is inflexible. 5. Each pair of sports cooperated with the tight bearing ablation and hold tight or even killed; the piston pin and the connecting rod bushing died; the Lv wheel shaft and its bushing died; the starting shaft and its bushing bite; the crankshaft axial clearance is too small, Or the backlash of the crankshaft and the connecting rod big head is too small, causing the hot car to start difficult. Sixth, other aspects of the failure such as oil grade is wrong, the viscosity is too large; there are assembly errors when replacing parts. To sum up, the single-cylinder diesel engine is difficult to start because there are many reasons, and sometimes it is caused by one factor. Therefore, when dealing with difficult-to-start failures, it is first necessary to clarify which of the three types of compression, operation, and fuel supply the fault belongs to. On the one hand, it then determines the cause of the problem based on the deeper manifestations of the failure. If the operation is inflexible, it may be caused by too tight movement or insufficient decompression. The compression may be due to valve leakage. The main reason for the abnormal oil supply may be the injection pump and the injector.

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