1. First, remove the fixing screws of the cylinder head. The screws should be loosened crosswise from both ends to the middle and removed in three times.

2. Lift the cylinder head, remove the cylinder gasket, loosen the oil drain screw of the oil pan, and drain the oil in the oil pan.

3. Turn the engine over, remove the oil pan fixing screw, remove the oil pan and oil pan gasket, loosen the fixing screw of the crude oil filter, and remove the oil filter, oil pump sprocket and oil pump.

4. Turn the crankshaft so that the piston of the engine cylinder is at the bottom dead center, remove the connecting rod fastening nut of the cylinder, remove the connecting rod bearing cover, pay attention to the connecting rod pairing mark and tidy it up, gently push out the piston connecting rod assembly of the cylinder with a hammer, and grasp the piston connecting rod assembly at the outlet of the cylinder by hand and take it out.