Inspecting The Seawater Pump - Yanmar 6LY3 series Service Manual

Seawater Pump Components and Functions
12/05
4. Take out the O-ring (Figure 7-3, (2)) and
impeller (Figure 7-3, (3)). Use the special tools
shown in Figure 7-4, (3) and (4).
M24 x 2
Figure 7-4
(1)
(2)
(4)
(3)
Figure 7-4
1 – Pump Body
2 – Impeller
3 – Special Tool "A"
4 – Special Tool "B"
5. Remove the wear plate (Figure 7-3, (12)) and
the mechanical seal (Figure 7-3, (4)).
6. Insert pliers from the drive gear long hole and
remove the stop ring that holds the bearings.
7. Lightly tap the pump shaft from the impeller
side and remove the pump shaft, bearings and
drive gear as a set.
8. Remove the lip seal and mechanical seal if
necessary.
6LY3 Service Manual
M10-length 40 mm (1.6 in.)
(1)
0006203
© 2007 Yanmar Marine International

Inspecting the Seawater Pump

Rubber Impeller
If there is damage or wear on the impeller, replace
it.
Wear Plate
Replace the wear plate if the side surface is worn or
deformed.
Pump Housing
Replace the pump housing if there is excessive
wear on the inner surface of the housing or on the
sliding surface of the impeller.
Mechanical Seal
Replace the mechanical seal if there is water
leakage from the drain pipe (coolant leakage: less
than 3 cc (0.014 oz) / hr).
NOTICE: Be careful not to damage any sliding
surface while replacing. Coat the sliding surface of
the mechanical seal with a small amount of
high-quality silicon oil to prevent early leakage due
to insufficient run-in. Coat the seal bore with liquid
sealant.
Bearing
Inspect the bearing for wear and damage.
COOLANT SYSTEM
7-7