COOLANT SYSTEM
Seawater Pump Components and Functions
7-6
6LY3 Service Manual
© 2007 Yanmar Marine International
SEAWATER PUMP
COMPONENTS AND
FUNCTIONS
The seawater pump
(Figure 7-2)
has a rubber
impeller. The seawater pump is installed to the
drive shaft housing and is driven by a gear.
Figure 7-2
Figure 7-2
Disassembling the Seawater Pump
1. Remove the rubber hose from the seawater
pump outlet
(Figure 7-3, (14))
.
Figure 7-3
Figure 7-3
1 – Heat Exchanger
2 – O-Ring
3 – Impeller
4 – Mechanical Seal
5 – O-Ring
6 – Seawater Inlet
7 – Pump Drive Gear
8 – O-Ring
9 – Drive Shaft Housing
10 – Pump Gear Nut
11 – Seawater Pump Body
12 – Wear Plate
13 – End Cover
14 – Seawater Pump Outlet
2. Remove the seawater pump assembly from the
drive shaft housing
(Figure 7-3, (9))
.
3. Remove the seawater pump end cover
(Figure 7-3, (13))
.
Seawater Pump Performance Specifications
Flow
Minimum 215 L / min. (57 gal) at
In = -0.4 bar (-6 psi)
Out = 1.2 bar (17.5 psi)
2933 rpm
after 100 hours of duty
Self-Priming Ability
Maximum 10 seconds at
suction head = 0.5 m (1.5 ft)
length of pipe = 0.6 m (1.9 ft)
622 rpm
Tightness Test
4 bar water (58 psi)
Leakage from seal:
Maximum 0.03%
Seawater Pump Durability Specifications
Impeller
Flow Drop
Minimum 1500 hours
Maximum 10% after
1000 hours
Water Lip Seal
Minimum 1000 hours
Wear Plate End Cover
Minimum 1500 hours
Other Parts
Minimum 3000 hours
0006201
0006202
(1)
(1
3
)
(14)
(2)
(
3
)
(4)
(5)
(6)
(7)
(
8
)
(9)
(10)
(11)
(12)
