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2
offending
cylinder
will
couse
the
fluc-
tuotions
to
become
less
f
requent.
lf
torquing
the cylinder
heod
to
speci{i-
cotions
does not stop
the
leokoge,
the
cylinder
heod gosket
must
be reploced.
Rodiotor Filler Cop
The
rodiotor
cop is on
otmospheric
vented cop. The
otmospheric
vent
volve
closes
only
if
there
is
o
coolont
vopor
flow through the vent volve
of
.4
to
.7
cubic
feet per
minute.
When
the vent volve
closes,
the
system will
become
pressurized
to
1
3
pounds
per
squore
inch.
Pressurizing
the
cooling
system
increoses
the boiling point
of
the coolont
opproximotely
3o
F.
for
every pound
of
pressure.
FIGURE
5
-
Sectionol View
of
Rodiotor Filler Cop
To test
the rodiotor
flller cop
(Fig.
6), first wet the cop rubber
gosket to
insure
on oirtight
seol;
then ottoch
the
cop
to the
tester.
Since
the
rodiotor
cop
is vented
to
otmosphere
until
the
coolont
vopor
flow
through
the
vent
volve
exceeds
.4
to
.7
cubic
feet
per
minute,
it
will
require severol
violent
pump
strokes
to
seot
the volve
when
the cop
is
in the upright
position.
The
cop
should
be copoble
of
retoining
pressure
within
o
ronge
of
12
to
I5
pounds per squore
inch.
FIGURE
6
-
Rodiotor
Pressure
Cop
Test
THERMOSTAT
A I95'
F.
thermostot
is locoted
in
the cylinder
heod
woter
outlet
housing
to
insure
proper engine operoting
tem-
perotures
for
moximum economy
ond
engine
life. AIwoys
use
o
thermostot
os
on
engine moy
be
overcooled
os
well
os
overheoted.
COOLING
NOIE,
Ihe
lhermosiol shou/d
be
checked whenever
lhe
coo/ing
sys-
lem
is
serviced
and porticulorly
ot
the
time
of
instollation
of
ontifreeze
soluiion.
To test the thermostot
for
proper
op-
eroting
temperoture, submerge
the
unit
in
o
contoiner
of
woter os
shown
in
FigureT.
The thermostot os
well
os the
thermometer
should
be
suspended
in
the woter in
such
o
monner
so
thot
they
do
not
rest
on
the
bottom or
con-
toct the
sides
of the
contoiner.
Heot
the woter ond
observe
the
tempero-
ture
ot
which
the
thermostot
begins to
open. The
volve
must
stort
to
open
within
plus
or
minus
2o
F.
ol
its
roting.
t90'F
I
ao'F
Ito'r
FIGURE
7
-
Testing
Thermostot
WATER
TEMPERATURE
GAUGE
The
woter
temperoture
gouge
is
coli-
broted
to
record coolont
temperotures
os
illustroted
in Figure
8.
Coolont temperoture reodings
in
the bond
between
the ']60"
F.
ond
230'
F.
groduotions crre
considered
normol operoting temperoture.
How-
ever,
during exlreme cold weother
op-
erotion, the temperoture
indiccrtion
will
be correspondingly
lower.
n
the
event
the
thermostot
is
held open
with
foreign
porticles,
the
temperoture
indicotor
moy
noi
move
off the cold
indicofion
during cold
weother operotion.
AIso,
under
extreme lood
conditions,
high
ombient temperoture,
or
oltitude
operollon,
woter temperoture
indico-
tion moy
reoch
the
extreme
hot
side
of the
scole.
These
ore
not
considered
obnormol reodings
providing
coolont
loss
does
not
result.
With
the
13 pound
pressure
cop,
the
otmospheric boiling
point
of woter
is roised opproximotely
400
F.
CAUIION, Never
remove
lhe
ro-
diotor cop when lhe woter
temper-
oiure is
to
the
extreme
hof side
of
the sco/e.
fo
do
so
will
depressurize
the
syslem
ond lower lhe
botling
potnt
of
fhe cooion/.
Serious iniury
moy result
from
the
ropid
escope
of
sleom.
To test
the
occurocy
of
the
tempero-
ture gouge on the cor,
it
is
necessory
to
interpret
the
reodings
obtoined
on
the
gouge.
On the cor
tests
ore
limited
to
tem-
perotures
obove thermostot
opening
temperoture. Use
o
Fohrenheit
ther-
morneter
in the
rodiotor
flller
neck
opening.
To test
the
indicotor
through-
out its
entire
rcrnge,
the
temperoture
sending
unit
must
be
removed
from
the
block
or
use
o
known
to
be
good
send-
ing
unit ploced
in
o
pon
of woter
with
o
thermometer.
Heol the woter
to
the
temperoture check points
in
Figure
8.
A
minimum
of two
minutes must
be
ol-
lowed
ot o
constont temperoture for
the
indicotor
to
stobilize.
For electricol
tests, consult
the
Electricol Section
of
this monuol.
FAN
.l95.6
Cubic
lnch
Four
blode fons
ore
used.
Five
blode fons
ore
used
in
con-
iunction
with o
shroud
on the rodiotor,
when
equipped
with
oir
conditioning.
232 Cubic lnch
t2o"r
'l60oF 230'F
260o
F
!
\IR
\
E
FIGURE
8
-
Woter
Temperoture
Gouge
re
vP
n
Six
blode fons
ore
used
\
l
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