Yanmar BY Series Service Manual page 124

Cylinder Block and Crankshaft
Figure 5-119
Note: Back the center screw out of the tool
before attaching to seal.
4. Thread in special tool OEM No. 11 1 210 until it
has firmly grasped the seal housing.
5. Turn center screw in to remove seal.
6. Wipe the sealing surface in the cover clean.
4BY Engines
BY Service Manual
6BY Engines
Figure 5-120
7. Install seal protector tool OEM No. 11 7 400
(4BY) or 11 6 470 (6BY) on end of crankshaft.
Lubricate surface of tool with clean engine oil.
IMPORTANT
NEVER touch the sealing lip of the new seal
with your fingers.
8. Slip seal over seal protector until it contacts
case cover. Remove seal protector.
ENGINE
5-69