Yingang YG125-23, Maintenance Manual

Page: 84 / 149

YG125-23Maintenance ManualCrankcase, crankshaft and Shift mechanism
91
Crankcase
To remove the crankcase:
1. Remove the engine from the frame (engine oil fully
drained) and put it on the assembly operating table.
2. Remove such parts and components as right hand
crankcase cover, clutch, gear shifter, cylinder head
cover, camshaft, cylinder head, cylinder, piston, left
front cover, rotor assembly, electrical starting
transmission system, driving drive sprocket, etc.
(Refer to the related sections).
3. Use a bakelite hammer or a nylon hammer to strike
the left hand crankcase gently to separate it with the
right hand crankcase.
4. Remove the driving/driven shaft, gearshift drum, shift
fork, etc.
5. Remove the cranks-haftand balance shaft
。
Notice
Do not pry the left/right hand crankcase body by
inserting such tools as screwdrivers into the mould
closing face.
To mount the crankcase:
1. Place the right hand crankcase on the assembly
operating table, and assemble the internal parts and
components of the crankcase, including crankshaft,
balance shaft, driving/driven shaft, gearshift drum,
shift fork, etc
2. Clean up the left and right crankcase box surface,
put the new crankcase paper pad, confirm the
positioning pin.
3. Use the counter shaft oil seal guide to protect the
counter shaft oil seal, use the gearshift drum oil seal
guide to protect the gearshift drum oil seal, and
mount the left hand crankcase (closing).
4. Mount the mould closing bolt and fasten it.
5. Mount other parts and components of engine, mainly
Balance shaft
Gearshift
drum
Crankshaft box paper pad
Driving shaft
Counter shaft
Cranks-haft
Counter shaft oil seal
Gearshift drum oil seal
Shifting arm oil seal
Remove the mould closing bolt