Oil Pump; Cooling System - Ezgo 1600xd Repair Manual

3.2.5 OIL PUMP

1
(1) Inlet
(2) Outlet
The oil pump is a gear pump, whose rotors have trochoid
lobes. The inner rotor (3) has 4 lobes and the outer rotor (4)
has 5 lobes, and they are eccentrically engaged with each
other. The inner rotor, which is driven by the crankshaft
through the gears, rotates the outer rotor in the same
direction, varying the space between the lobes.
While the rotors rotate from (A) to (B), the space leading
to the inlet port increases, which causes the oil to flow
through the inlet port.
When the rotors rotate to (C), the port to which the space
leads,is changed from inlet to outlet.
At (D),the space decreases and suctioned oil is discharged
from the outlet port.
SUUV-W00 Apr. 2011
ENGINE - STRUCTURE AND FUNCTION
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4 2
196W224B
(3) Inner rotor
(4) Out rotor

3.3 COOLING SYSTEM

1 2 6
(1) Radiator
(2) Suction fan
(3) Water pump
The cooling system consists of a radiator, centrifugal
water pump, suction fan and thermostat.
The water is cooled through the radiator core, and the fan
set behind the radiator pulls cooling air through the core to
improve cooling.
The pump draws in the cooled water, forces it into the
cylinder block and draws out the hot water. Then the
cooling is repeated. Furthermore, to control temperature
of water, a thermostat is provided on the way. When the
thermostat opens, the water moves directly to radiator, but
when it closes, the water moves toward the water pump
through the by-pass between thermostat and water pump.
The opening temperature of thermostat is about 83°C (180°F).
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5
4
196W225C
(4) Cylinder block
(5) Cylinder head
(6) Thermostat
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