1. When replacing the cylinder liner piston, it is not optional when replacing the cylinder liner piston. Some operators think that the new cylinder liner and piston are standard and can be installed. In fact, cylinder sleeves and pistons have certain tolerances. If the cylinder with the largest size is equipped with the piston with the smallest size, the fitting clearance will be too large, resulting in weak compression and difficulty in starting. Therefore, when replacing, it must be noted whether the standard piston size grouping code is the same as the standard cylinder size grouping code.
2. When the exhaust pipe is drained, the engine is still forced to start. If the engine just starts to emit a "jump" sound, and the exhaust pipe has water droplets discharged, the engine runs back to normal for a while, and later found that the water in the radiator is less a lot of. This phenomenon is often caused by the slight collusion between the cylinder head gasket water channel hole and the cylinder, resulting in the infiltration of cooling water into the cylinder. At this point, the engine cannot be started and the cylinder head gasket should be replaced.
3. Flush gasoline tank with compressed air Before welding and repairing gasoline tank, you must first clean the gasoline in the oil tank, and some repair personnel use compressed air to flush the gas tank. Because the tank port is small, gasoline molecules will produce sparks in the tank due to strong collision. It can easily cause explosions and cause personal injury or death. Therefore, the tank cannot be flushed with compressed air, and the tank should be cleaned with a cleaning agent.
4. Combine harvester operation, reduce the speed of the throttle by reducing the throttle speed When harvesting, when you need to turn or feel the machine has a blockage, some operators use the throttle to slow down the speed, which can easily cause the roller, etc. The clogging reduces the quality of the work. Because the work of each component is provided by the engine and transmitted by the transmission mechanism with a certain torque, such as reducing the throttle, the output torque of the engine is reduced, and the torque obtained by each working component will be reduced accordingly. If the grain at the drum or the like has not yet been "digested", the torque of the working part will not be sufficient to overcome its resistance, causing the threshing and the quality of the cleaning to fall. In severe cases, the drum, the stripper and the like will be blocked. Therefore, avoid reducing the throttle during work. If you need to slow down, you can reduce the gear.
5. Driving a backpack harvester, the front rushing forward and down the steep slope. Some of the pilots are driving the backpack harvester. When entering the low field from the road, the slope will be opened regardless of the slope. This operation can easily damage the header. Because the height of the header of the backpack harvester is generally small. The correct way to drive is: if the slope is relatively large, it is best to drive in reverse, and to drive slowly; if you find that the header is still at risk of dragging while you are driving, do not rush into the ground. Instead, drive the locomotive forward. On the way, ease the steep slope before you go down.
6. In the commissioning of the plunger-type fuel injection pump, the stroke allowance of the plunger is not checked. The so-called plunger stroke allowance refers to the amount of movement that the plunger can continue to ascend after being received by the top camshaft of the camshaft on the camshaft. After adjusting the start time of fuel supply, the reason why the travel allowance is also checked is because the stroke allowance of the plunger is related to the wear of the plunger and the sleeve. After the plunger and sleeve are worn out, the plunger has to travel a bit more before it can begin to supply oil, delaying the start of oil supply. When the adjustment bolt is screwed out or replaced with a thicker adjustment pad or spacer, the lowermost position of the plunger moves upwards, so that the stroke margin of the plunger is reduced. Therefore, when repairing and debugging the fuel injection pump, it is firstly necessary to check the travel allowance to determine whether the injection pump also allows adjustment. During inspection, the following different methods should be used according to the different structures of the fuel injection pump: 1 After rotating the camshaft and pushing the plunger to the top dead center, remove the oil valve and valve seat and measure with a depth gauge. 2 After the plunger is topped up to the top dead center, use a screwdriver to pry up the spring seat of the plunger spring to raise the plunger to the head. Then use a thick gauge inserted between the plunger under the plane and the adjustment bolt on the tappet to measure. Plunger standard travel allowance is about 1.5mm, wear limit should not be less than 0.5mm
7. When measuring the cylinder gap, there is no measurement in the direction of the piston skirt perpendicular to the direction of the piston pin hole. When measuring the cylinder gap, the piston skirt is not measured in the direction perpendicular to the piston pin hole but measured in the other direction. The structural characteristics of the aluminum alloy piston is that it is small and large, it is a cone, and the skirt has an elliptical cross-section, so the cylinder gap in the circumferential direction is not equal. During the measurement, it is specified that the clearance in the direction of the long axis of the ellipse shall prevail, that is, the clearance of the piston skirt perpendicular to the direction of the piston pin hole shall be measured. This measurement is more convenient and accurate, and in the reciprocating motion, the direction of the piston skirt perpendicular to the pin hole of the piston is greatly abraded due to the side pressure. Therefore, when measuring the cylinder gap, the piston skirt should be perpendicular to the piston pin. The direction of the hole is measured.
8. Turn off the power with the power off button during high speed operation
The AK-10 starter magneto power-off button is only suitable for pressing when the starter is idle, causing the starter to stall. However, some hands are also used when the starter rotates at high speed. Doing so will not only cause the demagnetization of the magnet rotor of the magneto-magnet, which will cause the voltage to drop, the spark of the spark plug to weaken, but also the flammable gas mixture supplied by the vaporizer at this time will be more and more concentrated, which will lead to the combustion of the combustion chamber and the spark plug, resulting in the piston and cylinder sleeve. Wear has increased and spark plugs have not worked properly.
9. When a lot of hand-shafts are changed by the emery cloth, it is very difficult to reach the technical requirements because the wiping technology is difficult to grasp. To increase the contact surface between the watts and the shaft, the bearing bush is ground with an emery cloth. This method is not desirable, because the sand is hard, the alloy is soft, and the sand is easily embedded in the alloy during grinding. When the engine is working, it will accelerate the wear of the journal and shorten the service life of the crankshaft.
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