46. Crankshaft and Bearing Removal

Crankshaft and Bearing Removal

Crankshaft Removal Procedure

1. Before removing the crankshaft, measure the crankshaft end play using the following procedure:

1. Reinstall the lower crankcase.
2. Place a dial indicator at the crankshaft nose.
3. Gently force the crankshaft to the extreme front and rear positions with a pry tool while monitoring the movement of the dial indicator.
4. The crankshaft end play should not exceed 0.05-0.5 mm (0.002-0.020 in).
5. If the specifications are exceeded, replace the thrust bearing.
6. If a new thrust bearing does not bring the tolerances within specification, replace the crankshaft.
7. Remove the lower crankcase.

2. Locate or fabricate two V-blocks to support the crankshaft.




3. Using two hands, lift the crankshaft straight up from the engine block.
4. Place the crankshaft on the V-blocks in a secure place.




5. If damaged, remove the crankshaft sprocket drive pin (1) from the nose of the crankshaft.

Crankshaft Bearing Removal Procedure

1. Prepare a piece of cardboard, or equivalent, numbered one to five for bearing identification. Main bearing journals are numbered from the front of the engine.




2. Remove the upper crankshaft bearing halves from the cylinder block. Note the position of the thrust bearing (1) at the number three journal.
3. Place the upper main bearing halves on the cardboard in the correct positions. Note that the number three bearing is the thrust bearing.




4. Remove the lower main bearing halves from the lower crankcase.
5. Place the lower main bearing halves in the correct positions on the cardboard.