Mitsubishi 4DQ5 Service Manual Page 56

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l-Thermostat
2-Water
temperature!
3-8ypass hose
4-Radiator
5-Water
jacket
6-Cylinder head
7-Crankcase
8-Drain
plug
1. Coolant circuit
COOLING SYSTEM
2}---+-....!....-~lt
4
Direction
of
coolant
flow
Referring
to
the diagram, above, the coolant
is
set
in
forced recirculation by the water pump, which
is
a
centrifugal pump driven by cooling-fan belt. The pump
draws coolant from the lower tank section
of
radiator
G)
and forwards it to
the
water inlet
of
crankcase
(1).
As
the rising coolant temperature reaches 765°C
(169.7° F), the thermostat
valve
begins to open increas-
ingly wide and the coolant begins
to
flow to radiator
G)
at a rising rate
of
flow, with a corresponding decreases
in the amount
of
coolant being bypassed.
As
the tem-
perature reaches 90°C (194°F), the
valve
becomes
full
open, shutting
oU
the.
bypass
passage_
2.
Thermostat
The thermostat
is
of
wax type, designed to start opening
its
valve
at 76.5 ± 2°C (169.7 ± 3.6°F)
of
risingtem-
perature and opens it fully at
90°C (194°F), lifting it off
the seat by 9
mm
(0.35 in.).
2-1
Disassembly
(1) Remove thermostat cover (2) by loosening bolts
(1).
(2) Take out thermostat (3).
-
52-
~#-""is:::~r-~~L~ift~:~9
mm
(0.35 in.l
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