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(3)
ne
unit seal mu,t
b. replaced as
a
whol. ifwa!er
leakage
from
it
has
been com plained
by
the
use
r.
Referring to
the
sectional
\'iew
of
the unit
~al
,
examine
floating seat
(carbon) (I)
and
seal ring
(ceramic) (2)
particularly carefully
fo
r we:u.
If the
wear
is
found excessive
,
replace
the
unit
seal
.
Unit:
mill
(i
n.)
Item
Standard
Wear
limit
Free·state
height
2
1.8
±
I
of
unit
seaJ
(0.8
58
±
0.04)
Flo.ting
seat height
I.S
(0.059)
0
(4)
Check
the
fi
t
of
pump shaft in
the
bea
ring
inner
race
for lightness,
If
t
he fit
is
loose
or
if
the mating
faces
are
badly
damaged,
replace shaft
Or
bearing
or
both
.
Unit:
min (in.I
Item
Standard
O.GO
lT-O.Oln
Fit of
pump
shaft
in
(G.OOOO4T -
O.a0067T)(front)
bearing.
.inner race
a
.DOIT
-0.017T
(O.OOOO4T
- 0.OO067T)(rear)
(5)
Inspect the
bore provided
in
the water pump case
for
receiving the
bearing.
outer
races
lo
See
if the
bore
is
damaged
;
if
so
,
replace the cast or the
whole
pump
assembly.
Be
sur< that
the
bore
admits
the
bearing races with a tight
fit.
Unit
:
mm (i
n
J
Item
Standard
I
0.0
II
L
-
0.02
5T
([ront)
I
Fit
or
bearirlg
outer
(O.OOO4L
-
O.OOIOT)
races
in pump case
0.0
IlL -
O.025T
·
(rear)
bare
(0 .OOO4L - 0.00 lOT)
(6)
Inspec'
'
he threaded
portion
of
the impeller
for
danuge
.
Thermostat
inspection
Test
the remo· . . . ed
thermos.tat
to see
if
jt
starts
opening
at
76's°C
±
2'C(169
.7°F
±
3.6°F)
of
rising
,emperature
and
becomes fuUy open
.,90·e!
2°C(194°F ±
3.6°F
).
If the
difference between
these
temperature
levels
is
too
large, replace
the
thennostat.
The tes1.
is
carried
ou
t
by
immerSing
the
rhennostat in
water
contained
in
an
appropriately
sized
pan and
by
heatin
g
the water
with such
as
an
electric
stm'e_
Check
the
rising
temperature with
a
thermometer.
MA tNTENANCE
AND
AD JUSTM ENT
Inspection o[
fan
belt
and
fan
(1) Inspec' the
belt
for
signs
of
deterioration
such
as
c;racks,
and check
it
for permanent
stretch.
An
excessively stretched or
cracked belt
mus
t
be
replaced
.
(2)
lnspec! the
fan
blade,
for
distortion and crack'
and replac.e the
fan
as necessary.
Electrical
equ ipment
Starter
senrices
(I) Inspection before
disassembly
(a)
Checking
the starting
circuit
for
operation
With
the
starle
r
Ln
place,
check
to
be
sure
that
-
1.
The
battery
is
in
good condition, with
its
cell
plates. shOwing
.no evidence of
"sulhtioo"
or
any other
faulty
condition,
and
is
in
fuUy
cha rged state.
2.
The
battery terminal
connections
are dean and
tight.
3.
TIle
starter
tcnninal connections
ace tight,
4.
The
wires are
se curely
connected
to terminals.
and
arc:
free
of any insulaUon stripping due'
fraying
t
thefe
being
no
sig.ns
of
grounding
or
breakiI,g.
S.
The
s.tarter switch closes and opens the circuit
positively at each pos.ition.
Do not
jump
in to a
conclusion
that the starte
r
is
in
trouble when
the engine refuses
to
fire up
upon
cranking: the engine
could be
in
lrouble.
(b) No·load te,t
If the
starter
is
suspected of
trouble.
take
it
down
from the
engine :md run a no-load lest
on it
to
fmd out
if
it
is
really
in
trouble
.
W11en removing (he starter, be sUre to have the
battery switch ,umed
ofr.
Switeh
W
(AJ----,
v
No-load
test
ci
rcuit
-9
Battt!t'y
I
I
-e
Here's how to
car
ry
ou
t
the
no-load
test
:
Form
3.
lest circuit with
iI
voltmete
r
and an ammeter,
as 'hown
,
using a fully ch arged 24-volt battery
;
close
the
s.witch
to
run the
starter
un
til
its
79
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