Cauton: If there is any mechanical damage, the oil tank must be cleaned.
Remove the engine. See Group 11.
Disassemble the engine. See Group 11.
Removing selector shaft with pawl and index lever
Pry the sealing ring of the selector shaft out of the cover.
Press shift pawl (3) slightly outward and withdraw selector shaft with shift pawl (1, 3).
Remove index lever (2) and spring.
Removing selector forks
Pull out guide pins (6) of selector forks.
Swing the selector forks (5) out and remove them.
Inspect contact surfaces of selector forks and guide pins for signs of wear.
Removing selector drum
Withdraw selector drum (4).
Inspect selector drum guide tracks (7) and insulating washer (8) with neutral indicating contact (arrow) for signs of wear.