1. Check. Check whether the small cones at both ends of the high-pressure oil pipe are intact and whether the shoulder where the cone meets the oil pipe is flat.

2. Plastic surgery. Machining both ends of the high-pressure oil pipe into shapes matching with the connecting bolts of the connected fuel injector and fuel injection pump.

3. Install the calibration device. First, tighten the fastening nut of the fuel pipe at one end of the fuel injection pump. At this time, the cone at one end of the injector should be aligned with the cone hole on the nozzle bolt. If the alignment indicates that the pipe shape is correct, otherwise, the pipe should be reshaped until it is aligned and matched, and then tighten the fastening nut.

4. Install the fixing card. When installing the oil pipe, first install the fixing clip and fasten it in a proper position, and then alternately tighten the above two ends to check the coincidence of the small cone at the end of the high-pressure oil pipe with the cone hole. If the two ends of the pipeline are installed and then fixed, it will increase the stress of the high-pressure pipe and concentrate the stress on the shoulders of the cones at both ends, which is easy to cause cracking.