COOLANT SYSTEM
Coolant Pump Components and Functions
12/05
6LY3 Service Manual
7-9
© 2007 Yanmar Marine International
COOLANT PUMP COMPONENTS
AND FUNCTIONS
The coolant pump is a centrifugal (volute) type and
circulates coolant from the coolant tank to the
cylinders and the cylinder head.
The coolant pump consists of the pump body,
impeller, pump shaft, bearing unit and mechanical
seal
(Figure 7-7, (1))
. The V-pulley on the end of
the pump shaft is driven by two V-belts from the
crankshaft.
Figure 7-7
Figure 7-7
1 – Mechanical Seal
2 – Impeller
3 – Seal
4 – Cover
5 – Casing
6 – Shaft Bearing
7 – Pulley Seat
The bearing unit assembled in the pump shaft uses
grease lubricated ball bearings and cannot be
disassembled.
The totally enclosed mechanical seal spring
presses the impeller seal installed on the impeller
side away from the pump body side. This prevents
coolant from leaking along the pump shaft.
The impeller and pulley flanges are a press fit and
they cannot be disassembled.
0006206
(4)
(
3
)
(2)
(1)
(7)
(6)
(5)
Coolant Pump Specifications
Delivery Capacity
13200 L (3487 gal) / hr at
pump speed 3350 rpm
total head 13 m (46.2 ft)
