Yanmar 1GM User Manual page 93

SINGLE-CYLINDER ENGINES
87
Remo val and ins tallation
I. Remove the tim ing gearcase as previously described.
2. Remove the governor thrust washer (Fi gu re 55), thrust
bearing (Ffgure 56) and thrust sleeve (Figu re 57) from
the crankshaft.
3. Using a suitable
tool (if available, Yanmar special tool
124085-92700), unscrew the crankshaft nut (A , Figure
58).
4 . Remove the governor flyweight assembly (B, Figure
58).
NOTE
Early model engines may be equipped with
a nut on the oil pump shaft.
5. Early models-Unscrew the oil pump nut. To prevent
the pump gear from rotating, insert an Allen wrench into a
pump mounting screw through a hole in the oil pump
drive gear.
6. Reach through the holes in the oil pump gear and un-
screw the pump retaining screws (Figu re 59).
7. Remove the oil pump and gasket.
8. Clean any gasket residue from the oil pump and en-
gtnc.
5