1. A golden horse brand four-wheel agricultural vehicle has been used for eight years. In the near future, start the motor and the engine flywheel ring seriously. The driver sent the vehicle to the repair shop for repairs. The repairman made multiple adjustments to the eccentric screws on the starter motor and the failure persisted. Immediately after removing the starter motor assembly and checking, it was found that the impact of the engagement surface of the flywheel ring gear and the motor pinion gear was seriously worn out. Therefore, the driver was required to replace the flywheel ring gear and start the motor assembly, and the driver finally had no funds and failed.
The driver was introduced by helpless people and found a teacher at a farm machinery school. According to the teacher's analysis, the cause of the teeth is that the main circuit is turned on before the pinion meshes with the ring gear at start-up. Since the previous repairman has adjusted the eccentric screw and it is not effective, a gasket can be added at the proper position so that the gears can mesh first and then the rotor can rotate again. I saw the teacher speaking to one side and started to remove the electromagnetic switch on the starter motor and added a 2mm thick paper spacer in the middle. The installation was started and everything returned to normal.
2. When the author went to the countryside to engage in maintenance services during the wheat harvest in 2004, he discovered that a newly purchased combine harvester had stopped at the ground and the driver was busy with maintenance. Asked the reason, the driver said: "When the harvester is working, the engine is boring and there is a phenomenon of black smoke." Therefore, according to the driver's phenomenon, it is considered that the supply system may have a problem. Upon inspection, it was found that the upper end of the air filter housing cover was artificially wrapped with a layer of gauze. A layer of dust and grass was also attached to the surface of the air filter. We think that the problem may have occurred here. The crew removed the gauze and then started the machine to harvest it. Sure enough, the engine was obviously strong during work, and the exhaust pipe no longer smoked black smoke.
3. After the maintenance of a S195 diesel engine was completed, there was a feeling of piston top valve when cranking the crankshaft. Upon inspection, it was found that the valve push rod had been bent. The driver thinks that the timing gear is disorderly mounted, but there is nothing wrong with checking the gear's mounting mark. The push rod was straightened up again and the valve clearance was adjusted. The test was as before and the push rod was bent again. Another diesel engine, after repair, also has the feeling of a piston top valve, but the push rod is not bent, but the valve rocker arm is broken at one end of the long arm. In fact, the root cause of these two faults is the same, that is, the valve guide tube replaced when overhauled is higher than the cylinder head spring support surface (the correct height is (201) mm). When the valve stem of the valve arm of the valve rocker arm is pressed downward, the valve does not reach the specified opening, and the valve spring seat abuts against the upper end of the catheter. At this point, the crankshaft continues to rotate, because the valve stem can no longer go down, it will make the putter bent. If the push rod is stiff and not bent, it will break the rocker arm. If the rocker is not broken, the rocker seat fixing screws will loosen or break.

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