A four-wheel agricultural vehicle equipped with a 490 diesel engine was parked in open air for more than eight months. After being dragged by another vehicle, the gear was engaged and the clutch was engaged. Both driving wheels of the vehicle could not be turned. Dragged on the brakes. After stopping, the neutral clutch was engaged and the crankshaft could not be cranked. The four injector assemblies were later removed and the crankshaft was shaken again, and it was found that water was ejected from the injector mounting holes. Open the cylinder head and find that the top of the piston of the 4 cylinders is full of rust. The rust water was removed from the cylinder by cylinder and the crankshaft was turned to check the up and down movement of the piston. It was found that when the piston of the first cylinder moved to the top dead center, there was still 5 mm from the upper plane of the cylinder to move downwards. According to the analysis, since the water enters the cylinder, when the piston of the first cylinder is in the compression stroke, it is dragged and started by the Other vehicle to bend and deform the connecting rod. After careful inspection afterwards, it was found that the air intake pipe installed behind the cab had cracked, and the rainwater entered the air filter along the crack, and was filled up and entered the cylinder along the air intake pipe.
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