Seawater Pump Components And Functions; Disassembling The Seawater Pump - Yanmar 6LY3 series Service Manual

COOLANT SYSTEM
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
Seawater Pump Performance Specifications
Flow
Self-Priming Ability
Tightness Test
Seawater Pump Durability Specifications
Impeller
Flow Drop
Water Lip Seal
Wear Plate End Cover
Other Parts
7-6
0006201
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
Maximum 10 seconds at
suction head = 0.5 m (1.5 ft)
length of pipe = 0.6 m (1.9 ft)
622 rpm
4 bar water (58 psi)
Leakage from seal:
Maximum 0.03%
Minimum 1500 hours
Maximum 10% after
1000 hours
Minimum 1000 hours
Minimum 1500 hours
Minimum 3000 hours
© 2007 Yanmar Marine International

Seawater Pump Components and Functions

Disassembling the Seawater Pump

1. Remove the rubber hose from the seawater
pump outlet (Figure 7-3, (14)).
Figure 7-3
(14)
(2)
(3)
(13)
(12)
(11)
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)).
6LY3 Service Manual
(1)
(5)
(6)
(4)
(7)
(9)
(8)
(10)
0006202