1953 JEEP DJ ESP

'Jeep1
UNIVERSAL
SERIES
SERVICE
MANUAL

Dl

FIG.
D1-43—INTAKE
MANIFOLD
SEAL
INSTALLATION

1—Seal 2—Cylinder Head ing
hole
at left side of timing chain cover. If timing

chain
and sprockets have not been removed from
engine, install distributor with rotor in position
noted during distributor removal. Fasten distributor
to timing chain cover with retaining bracket and
mounting screws. If distributor is aligned, torque
screw
18 to 20 lb-ft. [2,5 a 2,8 kg-m.].

Dl-100.
Install Spark Plugs

Install
spark
plugs in cylinder heads. Torque 25
to 33 lb-ft. [3,5 a 4,6 kg-m.].
Install
spark
plug cable retainers on brackets welded to rocker arm
covers. Fit cables into retainers and connect to
spark
plugs, as indicated by cable numbers molded
into distributor cap and by
spark
plug firing order
pressed into each rocker arm cover.

Dl-101.
Install Intake Manifold
and
Carburetor
Assembly

a.
Install
a new rubber intake manifold seal at
front and
rear
rails
of cylinder block. Be sure
pointed ends of seals fit snugly against block and
cylinder
heads. See Fig. Dl-43.

b.
Set intake manifold in place on cylinder block

between
cylinder heads.
Thread
two cap
bolts
through manifold into each cylinder head as guide
bolts.
Lift
the manifold slightly and insert each
of two gaskets into position
between
manifold
and
corresponding cylinder head. Be certain that
the gasket is installed with its three apertures
FIG.
Dl-44—INTAKE
MANIFOLD

GASKET
INSTALLATION

1—Gasket
2—Guides Bolts aligned with ports of the head and manifold. One
gasket should be installed in position on the left
side, as shown in Fig. Dl-44, and its counterpart

reversed
for right side installation.

c.
Install
manifold attaching bolt in open bolt

hole
at right side of intake manifold. See
Fig.
Dl-46.
Open
bolt
hole
is held to
close
tolerances, so that
the bolt in this location serves to locate the mani­
fold front and
rear.

d.
Install
remaining manifold-to-cylinder head bolts, with longer
bolts
at forward location. Begin­
ning
with the number 1 and 2 bolts, see
Fig.
Dl-45,
tighten gradually and equally until both
bolts
are
snug.
This
will
prevent the manifold from shifting due to
full
torque being applied to only one bolt.

Then
continue in the sequence illustrated in Fig.

Dl-45
until the rest of the
bolts
are also snug.

Finally,
using the same sequence, torque all
bolts
to 45 to 55 lb-ft. [6,2 a 7,6 kg-m.].
12750

FIG.
Dl-45—INTAKE
MANIFOLD
BOLT
TIGHTENING
SEQUENCE

103

'Jeep9
UNIVERSAL
SERIES
SERVICE
MANUAL

E
exterior moving parts of a carburetor are
often

responsible for unsatisfactory performance.
For
this

reason,
efficient carburetion depends upon careful cleaning and inspection while servicing.

a.
Thoroughly clean carburetor castings and metal
parts
in carburetor cleaning solvent.

Caution:
Accelerator pump plunger and any fiber

or
rubber parts should never be immersed in
car­

buretor
cleaner. Wash pump plunger in cleaning
solvent.

b.
Blow out all passages in the castings with com­
pressed air. Dry all parts with compressed air.

Make
sure all jets and passages are clean. Do
not use wire to clean fuel passages or air bleeds.

c.
Check
inlet valve
needle
and seat for wear. If

wear
is noted, the assembly must be replaced.

d.
Check
float hinge pin for wear and check float
for damage.

e.
Check
throttle and choke shaft bores for wear

and
out-of-round.
f. Inspect idle mixture adjustment
needles
for
burrs
or
grooves; replace if damaged.
g. Inspect cup of accelerator pump plunger; re­
place if damaged, worn, or hardened. Inspect pump

well
in bowl for wear or scoring.

h.
Check
filter screens for
dirt
or lint.
Clean,
and

if
they remain
clogged,
replace.

i.
If for any reason parts have
become
loose
or
damaged in the cluster assembly, the assembly
must be replaced.

Note:
Use ijew gaskets whenever the carburetor
is disassembled.

E-37.
Throttle Body Assembly
a.
Install
idle mixture adjustment
needles
and
springs in throttle body. Tighten finger-tight, then
unthread
one
turn
as a preliminary adjustment
setting.

Caution:
Do not force idle mixture adjustment
needles
against
seats
or damage may result.

b.
Invert
fuel bowl body and place new throttle
body gasket on bowl. Fasten throttle body to bowl
body with three screws and lockwashers; tighten

securely.

E-38.
Fuel
Bowl Body Assembly

a.
Drop steel discharge check
tall
of accelerator
pump into discharge hole.
Install
pump discharge

spring
and T-shaped retainer. Stake retainer in
place.

Note:
Top of retainer must be flush with flat

surface
of fuel bowl body.

b.
Install
two inserts in main well. Align surface
on lip of insert with flat surface in recess on top
of main well.
Install
venturi cluster with gasket,

and
tighten mounting screws evenly and securely.

Be
certain that center screw is fitted with fiber gasket, and that a special smooth shank screw is
used.
c.
Install
two main metering jets, power valve
gasket and power valve.

d.
Install
small aluminum inlet check
ball
in ac­

celerator
pump inlet at
bottom
of pump well. In­

sert
pump return spring into well, and center by
pressing spring downward with finger.

e.
Install
pump inlet screen in
bottom
of fuel

bowl.

E-39.
Air
Horn Body
Assembly

a.
Install
choke lever and collar on choke shaft.

Prong
on choke lever must face away from air

horn
body and be on top of choke trip lever.
b.
Install
choke shaft and lever assembly into the

air
horn. Choke rod
hole
in the choke lever must
face fuel inlet side of carburetor.

c.
Install
choke valve plate in choke shaft so that
letters RP
will
face upward in finished carburetor.
Install
two new valve plate attaching screws, but
do not tighten securely until valve plate is centered.

To
center choke valve plate on choke shaft, hold
choke valve tightly closed, then slide choke shaft

inward
to obtain approximately .020" [0,508 mm.]

clearance
between
choke trip lever and choke lever

and
collar assembly. Tighten choke valve screws

securely,
and stake lightly in place. Choke valve

will
be perfectly free in all positions when installed
correctly.

d.
Insert
outer accelerator pump lever and shaft as­ sembly into air horn body, with lever pointing to­

ward
choke shaft.
Install
inner pump arm, with plunger
hole
inward,
and tighten set screw securely.
Position pump plunger assembly on inner pump
arm,
with pump shaft pointing
inward,
and install

retainer.

e.
Install
needle
seat screen on inlet valve seat. In­

stall
seat and gasket in air horn body. Tighten seat
securely with a wide-blade screwdriver.
f.
Install
power piston into vacuum cavity.
Lightly
stake piston retainer washer in place. Piston should

travel
freely in cavity.
g.
Install
air horn gasket on air horn body, fitting
gasket over guide pin.

h.
Attach inlet valve
needle
to float.
Carefully

position float and insert float hinge pin. Drop tang
at
rear
of float arm downward toward air horn.

i.
Install
fuel inlet fitting, if removed.

j.
With
air horn assembly inverted, measure the distance from the air horn gasket to top of float
at toe \%£f [27,78 mm.] for standard carburetors

and
\%i [29,36 mm.] for exhaust emission control
equipped carburetors, as shown in Fig. E-23. Use
float level
gauge
J-5127-2. Bend float arm as re­

quired
to adjust float level.

k.
With
air horn body held upright, measure dis­
tance from gasket to
bottom
of float
pontoon
at outer end. Use a l7/s" [47,625 mm.] float drop

gauge.
Bend float tang, as required, to adjust float

drop.
See Fig. E-24.

I.
Carefully
place air horn body on fuel bowl
body, making certain that the accelerator pump
plunger is properly positioned in the pump well.
Lower
the cover gently, straight down; install air 123

E

FUEL
SYSTEM
taching screws and valve housing from the fuel
pump body.

c.
Remove the two screws in the valve housing
and
separate the filter cover and air
dome
dia­
phragm.

d.
Remove the cam lever return spring, plug,
cam
lever pin, and cam lever from the pump body.

Tap
the cam lever pin out of body, using a drift
inserted through the small
hole
in the pump body.
e. Remove diaphragm from pump body.
f. Under normal service, the pump may be cleaned without further disassembly.

Note:
The oil seal (at top of spring in diaphragm
assembly) seals the spring side of the fuel
dia­
phragm
from the crankcase. Any deposit, in
excess

of a few drops, of oil on the diaphragm indicates leakage past the oil seal. Be sure the seat for the

seal
in the pump body is clean and smooth.

E-63.
Fuel
Pump Cleaning and Inspection

Caution:
Do not immerse valves or diaphragm
in
cleaning solvent; wipe clean.

Clean
all metal parts of the fuel pump in solvent.
Brush
with a stiff-bristled
brush.
Dry with com­
pressed
air.
Check
all parts to see that they are not
cracked
or broken and that the screw threads are
not damaged.

E-64.
Fuel
Pump Reassembly
•
Refer to Fig. E-32.

a.
Assemble the valve housing and filter cover, using a new air
dome
diaphragm. The opening

in
the air
dome
diaphragm is located over the
intake
valve. The filter cover is positioned cor­
rectly
when the inlet passage in the cover aligns

with
the inlet valve. Tighten the attaching screws
alternately and securely.

b.
Lubricate
diaphragm assembly shaft, around

oil
seal, with
engine
oil. Position diaphragm as­ sembly on valve housing and thread all the attach­ ing screws through diaphragm.
(This
helps avoid
damage to the screw
holes
in diaphragm.)

c.
Place diaphragm assembly and valve housing
in
position on pump body (align marks made
before disassembly).
First
start all screws one

or
two threads; then tighten the screws alternately

and
securely.

d.
Lubricate
forked end of cam lever, pin bore
of body, and corresponding
hole
in lever, and the
pin
itself with
engine
oil.

Note:
Forked
end of lever
goes
around diaphragm
shaft. Be sure
loose
bumper washer on diaphragm shaft is on top of lever and
between
lever and fixed
washer
on shaft.
e.
Install
lever and pin. To install pin, use a drift
and
tap pin into the
hole
in the body until it hits
the
stop
on the
bottom
of the hole;
move
the lever while tapping, to align
hole
in lever with the pin;
then install plug.
Install
lever return spring.
f.
Install
a new filter bowl gasket in filter cover.
Place
bail
assembly in ears on cover and swing
to one side.
Install
spring and new filter element in
bowl and install bowl on pump. Position
bail
as­
sembly under bowl; tighten retainer screw.

Caution:
Do not overtighten screw.

E-65.
Fuel
Pump Installation

a.
Make certain mating surfaces of fuel pump and

engine
cylinder case are clean. Cement a new gasket to mounting flange of fuel pump.

b.
Position fuel pump on cylinder block, so that

cam
lever of pump rests on fuel pump cam of cam­
shaft. Secure pump to block with two cap screws
and
lock washers. Torque
bolts
13 to 17 lb-ft. [1,8
a
2,3 kg-m.].

c.
Connect intake and
outlet
fuel lines to fuel
pump.

E-66.
Fuel
Pump Testing

Whenever
the fuel pump is to be checked for pres­

sure
or volume, follow the procedure outline in

Par.
C-23 of this manual.
Fuel
pump pressure is
important
for low pressure
will
seriously affect en­

gine
operation and high pressure can cause exces­
sive fuel consumption and flooding of the carbure­
tor.
Should there be any doubt of normal opera­
tion, check the procedure as outlined in Par. C-23.
In
addition to proper fuel pressure, volume of the
pump is also important. When testing for proper
pump pressure, be certain to also
test
for volume
as the pump may build up sufficient pressure, but
fail
to produce sufficient volume.

E-67. FUEL
PUMP
—
DAUNTLESS
V-6
ENGINE

Jeep vehicles equipped with the Dauntless V6-225

engine
have a special fuel pump which has a metering
outlet
for a vapor return system. Any

vapor
which forms is returned to the fuel tank
along with hot fuel through a separate line along­
side the fuel supply line.
This
greatly reduces any
FIG.
E-33—FUEL PUMP—DAUNTLESS V-6 ENGINE
1
—Fuel
Outlet 2—Vapor
Return
3—Fuel
Inlet

130

'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL

E
portant that
these
lines are not accidentally re­
versed.

When
installing the fuel tank on late model vehicles, position the tank
between
the frame
rail

to allow space to connect the fuel line(s), vent
hose

and
sending unit wire. After connecting
these
items, align and secure tank to frame brackets.
Position filler
hose
on tank filler neck and tighten
hose
clamp.
Fill
tank with fuel and check for leaks.

When
installing the fuel tank on early model vehicles, reverse the order of removal as given in

Par.
E-73.

E-75.
Fuel
Tank
Cap

A
surge pressure type fuel tank filler cap is used on

all
models.
This
is necessary to prevent fuel leakage
from
the cap vent opening when the vehicle is on a
side slope. Two spring loaded relief valves which
open when venting is required are built into the
cap.
Should the pressure valve
fail
to open, pressure
in
the tank may force fuel by the carburetor inlet
valve causing flooding.
Failure
of the vacuum valve may prevent flow of fuel to the carburetor. Should
the valves
fail
to vent install a new cap.

Note:
Vehicles having a
Fuel
Evaporative
Emis­

sion System are equipped with a non-vent sealed gas cap. The sealed cap is designed to allow no
vapors to discharge to the atmosphere. No other type of cap is to be used on vehicles having this
type system.

E-76.
Fuel
Gauge Float Unit

The
fuel tank
gauge
float unit is mounted in the top
of the fuel tank and consists of a housing enclosing
a
rheostat that is actuated by the float arm, and a
float
which
moves
with the fuel level in the tank.
On
V-6 and current production F4
engine
equipped vehicles, the fuel
outlet
pipe is integral with the
float
unit.
The fuel
outlet
pipe has a mesh filter on the inner end.

Note:
Under no circumstances should a fuel tank

gauge
be installed without a mesh filter element.

The
filter,
outlet
pipe, and float unit are locked as

an
assembly to the top of the fuel tank. To remove,

turn
the lock plate that secures the float unit
assembly.

E-77.
Fuel
Lines

Check
lines and connections occasionally for leaks,
and
for severe kinks that might restrict the flow of
fuel. If an excessive amount of
dirt
is found in the
carburetor
or fuel pump, the fuel tank should be
drained
and the fuel lines blown out with com­
pressed air.

All
rubber fuel lines and their respective clamps should be checked occasionally to be certain they
are
correctly positioned and not leaking. 133

Fl

EXHAUST
EMISSION
CONTROL
SYSTEMS
IMPORTANT
NOTICE

The
Exhaust
Emission Systems covered
in
this publication
meet
State and

Federal
requirements for hydrocarbon and carbon
monoxide
emissions.

To
assure continued proper operation,
these
systems
must
be
inspected

regularly,
parts must be replaced
at
factory-recommended intervals and
engine

tune-up services performed at intervals specified in the
Exhaust
Emission
Con­
trol
System Maintenance charts.

For
the
above
reasons,
these
systems
must not, under any circumstances,
be

altered
to anything other than
required
specifications provided in this publication.

Further,
the
Exhaust
Emission
Control
System, or any
of
its components, must
not be physically altered or modified in any respect.

DHTfl
TAG

For
the serviceman's guidance, each vehicle equipped with exhaust emission

control
will
have data
tag
permanently affixed
to the
radiator shroud—-in
example:

VEHICLE
EMISSION
CONTROL
INFORMATION
MODEL
F4-134
C.I.D.

•
ENGINE
AT
NORMAL
OPERATING
TEMPERATURE

•
LIGHTS
AND
ALL
ACCESSORIES OFF

•
IDLE
MIXTURE
. . .
LEAN
BEST
IDLE

•
IGNITION
TIMING
0*
(TDC)
•
SPARK
PLUG
GAP
. . . .030

•
DWELL
...
42* (.020
POINT
GAP)
•
IDLE
SPEED
. . .
700-750 RPM
TRANSMISSION
IN
NEUTRAL
DURING
TUNE
UP

SEE SERVICE MANUAL
FOR
ADDITIONAL INFORMATION
THIS VEHICLE CONFORMS
TO U.S.
DEPT.
OF
H.E.W.
REGULATIONS APPLICABLE
TO
1971 MODEL YEAR NEW MOTOR VEHICLES

Jeep
CORPORATION
14401

Important:
Always refer
to
the data tag when checking or re-adjusting ignition

timing,
idle speed, and idle mixture. 148

'Jeep'
UNIVERSAL SERIES SERVICE
MANUAL

Fl
EXHAUST
EMISSION
CONTROL
SYSTEM

Contents

DAUNTLESS
V-6
ENGINE
SUBJECT
PAR.

GENERAL
.F2-1
HEATED
AIR
SYSTEM.
. F2-2
Testing
Thermo
Air
Cleaner
F2-4
Positive
Crankcase
Ventilation
Valve.
. . .F2-6

Vacuum
Motor Replacement . .F2-8
Air
Cleaner Sensor Replacement F2-9
Replacement Procedures F2-7

AIR
PUMP
.F2-10

AIR
FILTER.
F2-11

AIR
DELIVERY
MANIFOLD.
F2-12

AIR INJECTION TUBES.
F2-13

ANTI-BACKFIRE
VALVE..
.F2-14
ENGINE COMPONENTS
.F2-15
MAINTENANCE
.F2-3
Carburetor
F2-16, F2-17

Distributor
F2-18

Anti-Backfire
Valve . . F2-19
Check
Valve..
F2-20

F2-1.
GENERAL
—V-6
Engine

The
Dauntless V-6
engine
Exhaust
Emission
Con­

trol
System consists of a belt-driven air pump

which
directs compressed air through connecting
hoses
to a steel distribution manifold into stainless steel injection
tubes
in the exhaust port adjacent
to each exhaust valve.
This
air, with its normal
oxygen
content, reacts with the hot but incom­
pletely burned exhaust
gases
and permits further combustion in the exhaust port or manifold.

The
Exhaust
Emission System on V6-225
engines

limits
the hydrocarbon and carbonmonoxide emis­sions from the exhaust system. The system includes

an
engine
designed for low emissions and lean
carburetor
calibration at idle and part throttle.

The
lean carburetion is possible because of the
heated air system that is part of the Emission
System.
See Fig. F2-2.
With
the heated air system
operating, inlet air temperature is around
115°F.
[46°C],
after the first few minutes of operation.

This
makes the use of lean (hot weather)
cali­
bration
possible, and the vehicle
still
responds and

drives
well in cold weather.

The
engine
has a "ported"
spark
advance, with the

vacuum
take-off just above the throttle valve, so that there is no vacuum advance at closed throttle,
but there is vacuum advance as
soon
as the throttle is opened slightly. To reduce emissions at idle and
at lower
engine
speeds, the
engine
timing is such
that the distributor
will
not have centrifugal ad­
vance until about 900 RPM.
F2-2.
HEATED
AIR
SYSTEM

The
heated air system on late model V6 engines,
consists of a manifold heat collector, a heated-air
SUBJECT
PAR.

Air
Pump F2-21
Intake
Manifold F2-22
Carburetor
Air Cleaner F2-5, F2-23

REMOVAL PROCEDURES
F2-24
Air
Pump. F2-25
Anti-Backfire
Valve..
. . .F2-26
Air
Distribution Manifold,

And
Air Injection Tubes F2-27

REQUIRED
EQUIPMENT..
. F2-28
REPLACEMENT
PARTS..
.F2-29

WARRANTY
F2-30
DIAGNOSIS GUIDE
F2-31
MAINTENANCE CHART.
F2-32
GENERAL
SPECIFICATIONS
F2-33

CARBURETOR SPECIFICATIONS.
.... .F2-34

DISTRIBUTOR SPECIFICATIONS
. .F2-35
SPARK PLUG GAP
F2-36
pipe, a adapter elbow and an air cleaner contain­ing temperature control doors operated by vacuum
through a temperature sensor. The heat
stove
is a
sheet
metal cover, shaped to and bolted on with
the right exhaust manifold. Air drawn in along the lower
edge
of the
stove
passes across the mani­
fold surface, picking-up heat. The heated air is
drawn
out from the front of the manifold, through
the heated air pipe and adapter elbow into the
snorkel
of the air cleaner.

The
temperature control air cleaner is designed to mix this heated air with cold air from under the
hood so that carburetor inlet air temperature aver­
ages
about
115°F.
[46°C.].
This
mixing is
done
by two air doors, a cold air door and a hot air door,

which
move
together
so that when the cold air door is closed, the hot air door is open and vice
versa.
Most of the time, both doors
will
be partially
open as required to control the temperature. When
the underhood temperature reaches about 135
°F
[57°C]
the cold air door
will
open wide and the
hot air door
will
close
tight See Fig. F2-3. Ob­ viously, if underhood temperatures rise above
135°F.
[57°C]
the air cleaner
will
no longer be
able to control temperatures and the inlet air tem­

perature
will
rise with underhood temperature.
The
temperature doors are moved by a diaphragm
type vacuum door. When there is no vacuum pres­ ent in the motor, the diaphragm spring forces the
cold air door open and the hot air door closed.

Whenever
the
engine
is running, the amount of
vacuum
present in the vacuum motor depends on
the temperature sensor in the air cleaner which is located in the vacuum line
between
the intake
manifold and the vacuum motor. In the sensor, a 149

'Jeep'
UNIVERSAL SERIES SERVICE
MANUAL

F2
F2-35.
EXHAUST EMISSION CONTOL SYSTEM
DISTRIBUTOR SPECIFICATIONS

Distributor:
Make
Delco-Remy Prestolite Prestolite
Model...
1110376
IAT-4501 or IAT-4502 IAT-4502A

Breaker
Point Gap .016"
[0,406
mm.] .016"
[0,406
mm.] .016"
[0,406
mm.]

Breaker
Arm Tension 19 to 23 oz. [538 a 652 gr.] 17 to 22 oz. [482 a 623 gr.] 17 to 22 oz. [482 a 623 gr.]

Cam
Angle. 29° to 31° 29° + 3° 29° ± 3°

Max.
Auto Advance
(Crankshaft
Degrees). 13° to 15° at 1,950 rpm. 16° (& 1800 rpm. 21° @ 1800 rpm.
26°
@
4200
rpm. (Max.) 32° @
4200
rpm. (Max.)

Max.
Vac. Advance
(Distributor
Degrees) 8° 8° 8°
Condenser Capacity. .18 to .23 mfd. .25 to .28 mfd. .25 to .28 mfd.

Timing:
Crankshaft
5°
(BTC)
@ Idle 5°
(BTC)
© Idle 0°
(TDC)
© Idle

Mark
Location Crankshaft Pulley Crankshaft Pulley Crankshaft Pulley

Firing
Order
1-6-5-4-3-2 1-6-5-4-3-2 1-6-5-4-3-2

F2-36.
SPARK PLUG
GAP

Spark
Plug Gap. .035"
[0,889
mm.]

IMPORTANT
NOTICE
The
Exhaust Emission Systems covered in this publication
meet
State and Federal
requirements for hydrocarbon and carbon
monoxide
emissions.

To
assure continued proper operation,
these
systems
must be inspected regularly,
parts must be replaced at factory-recommended intervals and
engine
tune-up services
performed at intervals specified in the Exhaust Emission Control System Maintenance
charts.

For
the
above
reasons,
these
systems
must not, under any circumstances, be altered
to anything other than required specifications provided in this publication.
Further,

the Exhaust Emission Control System, or any of its components, must not be physi­
cally
altered or modified in any respect.

DATA
TAG

For
the serviceman's guidance, each vehicle equipped with exhaust emission control

will
have data tag permanently affixed to the radiator shroud — in example:

VEHICLE EMISSION CONTROL INFORMATION MODEL V6-225 C.I.D.

•
ENGINE
AT
NORMAL OPERATING TEMPERATURE

•
LIGHTS
AND ALL
ACCESSORIES
OFF

•
IDLE MIXTURE
.. .
LEAN BEST IDLE

•
IGNITION TIMING
0*
(TDC)
*
SPARK PLUG
GAP 035
•
DWELL
. . . 30* (.016
POINT
GAP) •
IDLE SPEED
. . .
650- 700
RPM
TRANSMISSION
IN
NEUTRAL DURING TUNE
UP

SEE
SERVICE MANUAL FOR ADDITIONAL INFORMATION

THIS VEHICLE CONFORMS
TO U.S. DEPT. OF H.E.W.
REGULATIONS APPLICABLE
TO
1971
MODEL YEAR
NEW
MOTOR VEHICLES
Jeep
CORPORATION
14400
NOTE:
The
above
tag applies to vehicles equipped with Distributor Model
IAT-4502A.

On
vehicles equipped with Distributor Models
1110376,
IAT-4501 and IAT-4502 the tag is the same

except
that Ignition Timing is 5°
T.D.C.

Always
refer to the data tag when checking or re-adjusting ignition timing, idle speed, and idle mixture.
159

'Jeep*
UNIVERSAL
SERIES SERVICE
MANUAL

G and
scale, especially when used with a flushing
solution. A cleaning solution should be used to

loosen
the rust and scale before reverse flushing
the cooling system.

Flushing
is accomplished through the system in a direction
opposite
to the normal coolant flow.
This

action causes the water to get behind the corrosion

deposits
and force them out. To do this, remove
the upper and lower radiator
hoses.
Then
attach a
drain
hose
at the top of the radiator. Attach a new
piece of
hose
to the radiator
outlet
at the
bottom
and
insert the flushing gun. Connect the water
hose

to the flushing gun to a water
outlet
and the air
hose
to an air line.
Turn
on the water and when
the radiator is
full,
apply the air in short blasts,
allowing the radiator to
fill
between
blasts.
Con­
tinue this flushing operation until the water runs

clear
through the top
hose.

With
the thermostat removed, attach a leadaway
hose
to the water
hose
inlet. Also attach a length
of new
hose
to the water
outlet
connection at the
top of the engine.
Turn
the water on and
fill
the
water jacket and then apply air in short blasts.
Continue
this flushing until the water runs clear.

Also
do the hot water heater. Remove heater water

outlet
hose
from heater core. Remove inlet from 163