Yanmar 3YM30 Sevice Manual page 103

(34)Removing the main bearing
1) Remove the main bearing bolts.
2) Remove the main bearing cap and lower main
bearing metal.
NOTE:
The thrust metal (lower) is mounted to the base main
bearing cap.
(35)Removing the crankshaft
1) Remove the crankshaft
NOTE:
1) The thrust metal (upper) is mounted to the
standard main bearing of the cylinder block.
2) Remove the main bearing metal (upper) from the
cylinder block.
(36)Removing the tappets
Remove the tappets from the tappet holes in the
cylinder black.
NOTE:
1) Be careful to keep all disassembled parts in order.
2) Prepare clear and adequate area for parts and a
container(s).
3) Prepare a cleaner before disassembling.
4. Disassembly and reassembly
Cylinder block
Thrust metal
Main bearing
(Base)
(Removing main bearing and crankshaft)
88
Crankshaft
Main bearing
Main bearing bolt