In the maintenance and repair of agricultural machinery, the use of air blowing method can quickly determine the approximate location of the failure, very simple and practical.
1, to determine whether the cylinder pad between the two cylinders is damaged: remove the two cylinder fuel injectors or spark plugs, use a thin paper dipped in water to seal one of the cylinder injector or spark plug mounting hole, with a duct to the other cylinder blowing Gas (or with compressed air). If the paper is blown up, the cylinder pad is damaged, and the air between the two cylinders blows.
2, to determine the cylinder tightness: the piston to the compression near the top dead center, the catheter inserted into the injector or spark plug mounting hole (first remove the injector or spark plug), with a pump through the catheter into the cylinder into the compressed gas, If you hear the sound of air leakage in the crankcase, it means that the piston ring of the cylinder is not tightly sealed; if you hear the noise of “嘘†in the inlet and outlet ports, it means that the inlet and outlet doors are not tightly sealed; Apply soapy water to the cylinder head to see bubbles, indicating that the gasket is not tight.
3, determine the valve seal: Wash the valve into the valve into the grind valve, and press the tight valve, smoke a cigarette, smoke to the intake manifold or exhaust manifold mouth (mouth should be tight). If there is smoke between the valve and the valve seat, the valve seal is not strict.
4. Determine whether the carburetor channel is open: Connect a certain diameter hose to one of the carburetor's oil passages, suck a smoke, and blow it into the hose. If no smoke emerges from the other outlet of the oil passage ( At this time there is a feeling of not moving, indicating that the oil passage is blocked.
5, to determine whether the ventilation hole is open: to determine whether the transmission case, rear axle housing, steering gear housing, crankcase and other parts of the ventilation hole is open, you can blow into the ventilation hole, if blowing does not move, indicating that the ventilation hole is blocked.
6. Determine the tightness of the fuel injection pump: Place the fuel injection pump side in diesel and inflate it from the oil inlet to the pump with a pump. When the plunger is in the fuel supply position, the diesel engine should be free from air bubbles. If there are air bubbles protruding from the conical orifice of the oil outlet valve, it means that the sealing gasket of the oil valve is not tightly sealed; if the air bubbles emerge from around the pump body, it means that the plunger sleeve shoulder and the bore hole of the pump body are not tightly sealed; If the air bubble emerges from the plunger set screw, the copper screw of the set screw is not tightly sealed.
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