Yanmar 1GM10 Operation Manual page 62

PERIODIC MAINTENANCE
1. Loosen the cover bolts and remove the
pump side cover (Figure 5, (7)).
(1)
(6)
(7)
Figure 5
1 – Cam
2 – Inlet
3 – Outlet
4 – Seawater Pump Body
5 – Impeller
6 – Gasket
7 – Side Cover
2. Inspect the internal components of the
pump.
• Inspect the impeller blades
(Figure 5, (5)). Look for nicks, cracks and
any evidence of damage. This includes
excessive scratches and marring of the
surface of the impeller blades.
• Inspect the condition of the pump body
(Figure 5, (4)). Look for corrosion and
evidence of structural damage to any
surface that is in contact with the impeller
blades. Make sure the walls of the pump
chamber are smooth and free of gouges
and corrosive pitting.
If no damage is found, reassemble the side
cover.
56
(3)
(2)
(5)
0005887
© 2007 Yanmar Marine International
Inspect the drain pipe under the pump
during operation. If excessive amounts of
water leak continuously, the oil seal needs
to be replaced. See your authorized Yanmar
Marine dealer or distributor.
NOTICE: During normal operation, the
pump impeller rotates in a
counterclockwise direction
(Figure 6, (1)). Use caution when
(4) installing the impeller to ensure that all
the blades of the impeller are set in the
proper direction. When turning the
engine over manually, do not reverse
the normal direction of engine rotation
or the blades of the seawater pump
impeller (Figure 6, (3)) may be damaged.
(4)
1 – Direction of Rotation
2 – Outlet
3 – Impeller
4 – Inlet
GM Series Operation Manual
(2)
(1)
(3)
Figure 6
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