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The pump shaft
is
supported
by
a
double
row
of ball
bearings
press fit
in
an
aluminum
die cast pump
body
The
bearings
are
permanently
lubricated
and sealed
to
prevent loss oflubricant
and entry
of
dirt
The
pump
is
provided
with
an
impeller
which
turns
on
a
steel
shaft
The
steel shaft
rotates
together
with
the
torque
coupling
wheeL The volute
chamber
is
built
in
the
engine
front
cover
assembly
The inlet of
the pump is
connected
to
the radiator
s
lower tank
by
a
hose
i
o
CQ047
Fig
CO 2 Water pump and
engine
front
cover
REMOVAL AND
INSTALLATION
Removal
in to
a
clean
con
assembly
I
CQ048
Fig
CO 3
Removing
water pump
Installation
1
Be
sure
to
clean the
gasket
sur
faces
in contact
with pump and front
cover
Always
use
new
gaskets
when
installing
pump
assembly
Be
sure
to
tighten
bolts
Cooling System
Tightening torque
0
4
to 0 5
kg
m
3
0 to 3
6 ft lb
2
Fill
cooling
system and check for
leaks
at
pump
3
Install fan blade
and
tighten
at
taching
bolts
securely
Install belt and
adjust
for
specified
tension
4
Operate
the
engine
at
fast
idling
and recheck for leaks
5
Install fan shrouds
Note
Ensure that clearance between
shroud and Can
is
even
at any
place
DISASSEMBLY
Water
pump is
made of
aluminum
and
its
bearing
outer
race
is
of
a
press
fit
type
For this
reason
water pump
should
not be
disassembled
INSPECTION AND
ADJUSTMENT
Inspection
Inspect
pump
assembly
for
the
fol
lowing
conditions and
replace
if
nee
essary
1
Badly
rusted
or
corroded
body
as
sembly
and
vane
2
Excessive end
play
or
roughness
of
bearings
in
operation
3 Reduced
cooling
efficiency
due
to
deteriorated silicone oil
4
Oil
leakage
in
torque
coupling
Adjustment
Fan
belt should
be
properly
ad
justed
at
all
times
A
tight
belt
causes
wear
of alternator and
water
pump
bearings
A
loose belt
brings
about
improper
cooling
fan
water
pump
and alternator
operation
Check the belt slack between alter
nator
and fan
pulley by
force of 10
kg
22
lb
Slackness of fan belt
8
to 12
mm
0 31
to
0
4 7
in
If
adjustment
is
necessary
loosen
bolt
retaining
alternator
adjusting
bar
to
alternator
Move
alternator toward
or
away
from
engine
until
the correct
tension is
obtained
TORQUE
COUPLING
Except
air
conditioner
equipped
models
The torque
coupling keeps
the fan
speed
at
2 500 rpm rated
or
below
to
conserve
horsepower
at
high engine
speed
It
also
helps
reduce fan
noise to
a
minimum
during
high speed
opera
tion
This
unit is
filled with
a
special
silicone oil used
as
a
fluid
coupling
which controls
the
fan
speed
Silicone
oil
can
not be
replenished
1
Torque coupling
wheel
2
Torque
coupling
cover
3
Torque coupling bearing
4
Pulley
5
Water pump
C0060
Fig
CO 4 Sectional view
of torque coupling
and water pump
00 3
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