Toyota B User Manual

co-2
COOLING SYSTEM
-
Description
I
DESCRIPTION
This
engine
utilizes a
pressurized
water forced
circulation cooling system which includes a thermostat
equipped with
a bypass valve mounted
on the outlet side.
To Radiator
Thermostat
From Radiator
Water Pump
OilCooler
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The
cooling
system is composed
of the water
jacket
(inside
the
cylinder block and
cylinder head),
radiator, water
pump,
thermostat,
cooling
fan,
hoses and
other components.
Coolant
which
is heated in
the water
jacket
is
pumped
to the radiator, where
the
cooling
fan
and
the vehicle
airstream
as
it
passes
through.
Coolant
which
has
been cooled is
then sent back
to the
engine
by the
water
pump,
where
it cools
the
engine.
The water
jacket
is
a
network
of channels
in
the
shell
of the cylinder
block and cylinder head
through
which
coolant
passes.
lt is
designed
to
provide
adequate
cooling
of the cylinders
and
combustion
chambers which
become
the hottest
during
engine operation.
RADIATOR
The
radiator
performs
the
function
of cooling the
coolant which
has
passed
through
the
water
jacket
and
become
hot,
and
is
mounted in the front of the
vehicle. The radiator
consists of an upper tank and
lower
tank, and a core
which
connects the two
tanks. The
upper tank contains the
inlet for
coolant
from
the
water
jacket
and, depending
on
the model,
a
hole for replenishing
water. lt also has a hose
attached through
which
excess coolant or
steam
can flow. The lower
tank contains the outlet for
coolant
and the drain cock.
The
core contains
many
tubes through which
coolant
flows from
the upper
tank to the lower tank
as
well
as cooling
fins which
radiate
heat away from the
coolant
in the tubes.
Coolant
which
has
passed
through the
water
jacket
and
become
hot is
cooled in this
part
by the air
sucked
in
by the cooling
fan
and by the
wind
generated
by the
vehicle's
travel.
Models with
automatic transmissions include an automatic
transmission fluid cooler built into the lower tank
of
the
radiator.
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Toyota B Specifications

General

Brand	Toyota
Model	B
Category	Engine
Language	English