Yanmar 1GM10 Operation Manual page 67

12/05
Replacing the Engine Oil Filter
Element
See Replacing the Engine Oil Filter
Element on page 55.
Inspecting the Seawater Pump
Impeller
Note: The seawater pump impeller
must be replaced every 1000
hours or every four years, even
if it is not damaged.
The seawater pump impeller will wear and
deteriorate with prolonged use. This will
reduce its capacity to move cooling water
through the engine. Inspect the seawater
pump impeller at its scheduled
maintenance interval or sooner if the
discharge volume of seawater is
diminished. Refer to Figure 5 when
performing this inspection.
1. Loosen the cover bolts and remove the
pump side cover (Figure 5, (7)).
Figure 5
(1)
(2)
(6)
(7)
Figure 5
1 – Cam
2 – Inlet
3 – Outlet
4 – Seawater Pump Body
5 – Impeller
6 – Gasket
7 – Side Cover
(3)
(4)
(5)
0005887
GM Series Operation Manual
PERIODIC MAINTENANCE
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.
Inspect the drain pipe under the pump
during operation. If excessive amounts of
water leak continuously, the oil seal needs
to be replaced. Consult authorized Yanmar
Marine dealer or distributor.
During normal operation, the pump
impeller rotates in a counterclockwise
direction (Figure 6, (1)). Use caution when
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.
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