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A case of failure of X6110 diesel engine
A X6110 diesel engine of a JM1065 combine harvester suddenly shuts off automatically during operation and can no longer be started. According to the repairman's on-site judgment, there are two oil discharge valves of the fuel injection pump that are not tightly sealed, but they cannot be started after the replacement of the oil valve. The driver suspects that the fuel injection pump is not good, but it cannot start after replacing the injection pump. The driver suspects that he was mistakenly installing the fuel injection pump, and asked the driver, who had experience in installation, to re-install it. As a result, the driver could not start again. Also doubt the battery, the fault remains. At this time, it was already dark, and when we saw the combine harvester, we had to spend the night in the wild. In the unfortunate case, the driver rushed back with grief and asked me to go ahead and make a diagnosis. I think on the way to go, according to the fact that the two oil valve leakage, it can be suspected that the corresponding two nozzles may be killed due to the lack of normal high pressure oil; but for the X6110 diesel engine, there are two cylinders should not work should Can also be started; so it should be the injector needle valve stuck in the normally open state, a large amount of fuel into the combustion chamber before the first flameout, when the start again, due to the two cylinders greatly increase the compression ratio to start The resistance is too large and the starting speed is not enough to start. Having determined this to the scene, I first took the method of draining oil, and let them remove the high-pressure fuel pipes of each cylinder to cut off the oil inlet channel; then, the starter motor was used to drive the diesel engine idle for a moment, with the purpose of passing the intake and exhaust valve rows. Drop oil, then connect the high pressure tubing to start. The result was a successful start. Although at this time, the diesel engine is not working due to the two cylinders, the rotational speed is not uniform, and the vibration is large, but the empty car is not problematic. From the above process we can see how important the failure analysis is to troubleshooting.