After a single-cylinder diesel engine has its bearing shells burned and the shaft seized, the bearing shells can be replaced by the following method. If necessary, the shaft can be ground. This method is simple and easy to implement. There is no need to disassemble the cylinder head and the piston connecting rod assembly, nor to adjust the valve clearance. It saves both time and effort.
If the crankshaft cannot rotate, you can first remove the drive belt on the flywheel, pry out the lock plate of the flywheel nut, put the special wrench for removing the flywheel on the flywheel nut, and strike the handle of the wrench clockwise with a hand hammer. Generally, the flywheel can rotate.
2. Remove the gear chamber cover, gears and rear cover, unscrew the flywheel nut and pull out the flywheel.
3. Use an appropriate elbow socket wrench to unscrew the connecting rod screw. After reducing the pressure, rotate the crankshaft to position the piston at the top dead center. Then remove the main bearing cover screw, push out the main bearing cover, reach out and unscrew the connecting rod screw from the rear cover. Take out the connecting rod cover, pull out the crankshaft from the side of the machine, and then pass a piece of iron wire through the screw on the connecting rod head and secure it firmly.
4. Determine how to repair the crankshaft journal based on the erosion condition and install bearing shells accordingly.
5. After installing the main bearing bush as usual, install the crankshaft. Rotate the crankshaft to make the crank move backward. Then pull the iron wire tied to the large end of the connecting rod to make the piston connecting rod assembly move down to the dead center until the large end of the connecting rod and the journal of the connecting rod are in contact. Insert the upper bearing plate between the big end of the connecting rod and the journal from the rear, and press the lower bearing plate into the connecting rod cover. Then, screw in the connecting rod screw by hand and install the main bearing cover properly.
6. After tightening the connecting rod screws to the specified torque, reinstall all the removed parts.
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Post time: Apr-30-2025