ENGINE
Cylinder Block and Crankshaft
12/05
BY Service Manual
5-57
© 2009 Yanmar Marine International
1 – Cylinder Block
2 – Coolant Drain Plug
3–Seal
4–Dowel Sleeve
5–Dowel Sleeve
6 – Piston Cooling Jet
7 – Crankshaft Pulse Generator Wheel
8 – Rear Crankshaft Seal Assembly
9 – Lower Main Bearing Inserts
10 – Lower Main / Thrust Bearing Insert
11–Oil Deflector
12 – Upper Main Bearing Inserts
13 – Upper Main / Thrust Bearing Insert
14 – Main Bearing Cap Bolt
15 – Dowel Sleeve
16 – Timing Chain Oiler
17–Seal
18 – Main Bearing Cap
Note: Service procedures for 4BY2 and 6BY2 engines are similar, therefore graphics shown will be
representative and might not match the engine being serviced.
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