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RADIATOR
PRESSURE CAP
FAN BELT
The pressure cap hetF
to pre
vent loss of coolant by ewaporatlon.
It should never be rcplaced bY a
nonpressure tYPe. The
Pressure
cap, which maintairc pressure in
the cooling system up to 7 Psi
[0,492 kg-cm?] makes the engine
more emcient bv
permitting
a
sliehtly higher opetating tempera-
ture. Vacuum in the radiator is
relieved bv a valve in the cap
which opds at % to L psi. [0,0ss a
u,u/u k g-c m!t v acu um,
To remove the radiator pressure
cap wheD the ensine coolant tem
peratuft is high or boiling, Place a
cloth over the pressure cap and
turn
counterclockwise
about
Za
turn
until
the fi.st
(pressure re-
lease) stop is reached. KeeP the
cap in this position until all Pres
sure is released. Then, Push cap
down and turn still further until
caP can be removed.
To instalt the pressurc cap, Place
it in position and tu.n it clockwise
as far as it will eo.
The fan aDd gencrator are driven
by a V-belt. The drive of the V-belt
is on the sides of the V. A fan belt
that is
^too
tight will cause rapid
wear or the generator and water
pump bearinss. If the belt is too
loose, it oay
slip preventiDg th€
water puop
from properly cooling
the engine or the geDerator from
prope.ly
chargins
the
el€ctricat
circuit. The fan belt is properly
adjusted when it can be den€cted
%" Ir3 r.rr..l with strons thumb
pressure midway bet\'€en the fan
and senerato. pulleys. Check this
adjustment and inspect the con-
dition
of the fan belt at each
engme lubrication
p€riod. It
is
good preventive maintenance to
replace a badly frayed, worn, or
cracked fan belt before it breaks
To .eplace the fan belt, Ioosen
the attaching bolts at each genei-
ator brace-to-engine mountirle and
pivot
the eenerato.
towa.d
the
engine to gaiD slack needed to in,
stall the new belt. Remove the otd
belt. Position the new belt over
the fan pultey, over the crankshaft
pulley, then over the generator
pulley. Pull the generato. away
rrom the ensine untiL rhe belt
tension is fiim. Ther tighten the
gelerator
mounting
bolts
and
check the
tension as indicated
above. Reset the
gene.ator as
necessary for coffect belt tension.
Finally,
if
a torque
wrcnch
is
available,
toque
the
gererator
mounting
bolts 25 to 35 lb-ft.
[3,4 a 4,8 ks-m.l.
FIG, 12 RADIATOR CAP
DRAINING
THE COOLING SYSTEM
Two drain cock
are provided
to completely drain the coolins
systeD. When &ainilg
the system,
to guard asainst freezins damage.
use carc
that
both
cocks
are
opened. One drain is located at
the bottom of the radiator, the
other in the cylinder
block under
the generator. Remove the radiator
cap to break any vacuum which
might prcvent tho.oueh dminioe.
COLD WEATI{ER
PRECAUTIONS
A thermostat, figure 10, No. 5,
i$ located in the water outlet in the
top of the cytinder head to Provide
quick wsrming and to Prevent
overcooling durins normal vehicle
oDeration. The valvc starts to open
ai app.oxim'tely 163"F. U3'C.l
and is fully ope'ed at 188"F.
[87'C.!. Th€ temperature at
which the unit operates is set bY
the manufacturer and cannot be
alt€.cd. Should sudden heating oc'
cu., the the.mostat
should b€
checked first as failure of this unit
will n€arly block the water circula-
tion. As a check, reDove the ther'
mostat
and
if
overheating
is
climinated, install a n€w one.
In regions where winter tempeia-
tures can be eyoected to droD be-
low 32" F. [ 0"C . i pre caut ions m usr
be taken to prevent freezing of the
water in the cooling system. With-
out the protection ofsumoent anti-
freeze sotutioD added to it, water in
the cooling system witl freeze and
expaDd, possibly buftting the radi-
ator and the cylinder block.
It is important that the cooling
system be made leak-pioof before
installing
any antifteeze
solution.
Be sure that hose connections a.e
tight and that the hoses arc in
good coDdition. Should there be
doubt regarding the condition of
either radiator
hoses or heater
hoses, replace them.
The base for the two most com
mon aDtifre€ze solutions is either
methyl alcohol or ethytene glycol.
Do nor mix these two tFes in rhe
cooiing system as a hyd.ometer will
not grve an acclrrate reading of the
Methyt
alcohol
has
a lower
evaporation point than ethytene
glycol.
For
this
reason, when
alcohol base solution is used it
should b€ checked at least once a
week. Use of ethyleDe glycol (per-
manent)
is mandatory
when
a
high-temperatu.e thermostat has
Immediately after adding anti-
freeze, run the ensine a few mo-
Dents to thoroughly mix the sotu,
The following
tables show the
degree of protection
obtained from
adding different amounts of anti-
THERMOSTAT
WATER PUMP
The water pump assembly is a
centrilugal imp€ller tl,?e of lerge
capacity to circlrlate the water in
the entire cooling system.
The sealed t}?e double-row ball
bcari'g is intesral with thc ahaft
and b-pacl€d at th€ time of a.!€m-
bly with a special hieh meltine
point $ease, so requires no lubri
The pump is designed to give
maximuo service without adjust-
ments. Should trouble develoP,
consult your 'Jeep' vehicle dealer'
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