Judging the fault location of the fuel-assisted vehicle Fuel-assisted vehicle drivers often refer to the engine that cannot be carried due to failures such as bush pull (or burn), camshaft burn, cylinder pull, etc. as a load vehicle. For fuel-assisted vehicles, if you blindly disassemble and inspect, it takes time and effort. If the long slot hole on the positioning plate has turned to the limit and the positioning pin still cannot be inserted into the hole, you need to reassemble the engagement lever assembly, change its spline fitting position, and tighten the two positioning plate fixing bolts after adjustment. Engage the lever assembly fixing bolt. The fuel-assisted vehicle should repeatedly pull the engagement lever assembly several times, and the movable claw-shaped coupling should slide freely. From the inspection hole, the two coupling teeth in the joint position should be fully engaged, and the separated position should be fully disengaged. When the bearing bush is pulled (or burned), the wear-resistant alloy layer will fall off and become a powder and enter the oil in the oil pan. Part of the oil will be pumped into the oil passage by the oil pump, and it will adhere when passing through the filter. On the filter element. Therefore, when encountering a load, the oil filter cover should be opened first to check whether the alloy layer powder adheres to the surface of the filter element. If there is, it is a bearing bush (or burned). Adjust the gear oil pump transmission device—when the pump transmission device is disassembled and reassembled, first make the teeth of the movable claw coupling and the fixed claw coupling in the full tooth meshing position, and then fix the two fixing bolts on the positioning plate When loosened but not screwed off, insert the positioning pin on the engaging lever assembly into the hole on the rear side of the positioning plate (on the side of the gear oil pump). Then check the connecting rods one by one to see if there is any axial clearance. When there is no abnormal condition, open the main bearing cover one by one to check the main shaft bushing and burning. If there is no shed powder of the alloy layer, it is because the camshaft is burning or pulling the cylinder. At this time, you should withdraw the thrust screw on the timing gear chamber cover, and use a crowbar to pry the camshaft along the axial direction to see if it can move. If it cannot move, the camshaft is burned. If it can move without abnormal conditions, then It is a failure to pull the cylinder.