Water Pump; Thermostat - Ezgo 1600xd Repair Manual

3.3.1 WATER PUMP

4 3 2
(1) Water pump impeller
(2) Mechanical seal
35ℓ/min. (7.7 lmp.gals/min, 9.2 U.S gals/min) of water is
forced into the crankcase and cylinder head to cool them.
The impeller, of backward type, is bent as far as possible
from the center, in the opposite direction to rotation; the
bearing unit prevents cooling water from entering by a
special mechanical seal.
3
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ENGINE - STRUCTURE AND FUNCTION
1
196W226B
(3) Water pump body
(4) Bearing unit

3.3.2 THERMOSTAT

4
5
1
8
2
7
7
3
(1) Seat
(2) Valve
(3) Pellet
(4) Spindle
(5) Synthetic rubber
The thermostat is wax pellet type, which controls the fl ow
of the cooling water to the radiator to keep the proper
temperature. The case has a seat (1) and the pellet has a
valve (2). The spindle attached to the case is inserted into
the synthetic rubber in the pellet. The pellet is charged
with wax.
(A) At low temperature (lower than 71°C (160°F))
The valve (2) is seated by the spring (7) and the cool-
ing water circulates in the engine through the water
return pipe but not the radiator.
(B) At high temperature (higher then 71°C (160°F))
As the water temperature rises, the wax in the pellet
(3) melts and expands, repelling the spindle. The pel-
let lowers and the valve (2), opens to send the cooling
water to the radiator.
6
196W227B
(6) Wax (Solid)
(7) Spring
(8) Leak hole
(9) Wax (Liquid)
SUUV-W00 Apr. 2011