1953 JEEP DJ engine overheat

G
COOLING SYSTEM G-20.
SERVICE DIAGNOSIS

SYMPTOMS
PROBABLE REMEDY

Overheating:
Lack
of Coolant Refill radiator
Thermostat inoperative . Replace thermostat
Water
pump inoperative. Overhaul or replace
Incorrect
ignition or valve timing. Set
engine
timing
Excessive piston blowby Check pistons, rings and cylinder walls
Fan
belt
broken or badly worn Replace
belt

Radiator
clogged
Reverse flush and clean
Air
passages
in core
clogged
Clean with water and air pressure
Excessive carbon formation. Remove carbon from cylinder head(s) Muffler
clogged
or
bent
exhaust
pipe
Replace damaged part

Loss
of Cooling
Liquid:
Loose
hose
connections
Tighten
connections

Damaged
hose
Replace
hose

Leaking
water pump Overhaul or replace

Leak
in radiator Remove and repair
Leaky
cylinder head
gasket
Replace
gasket
Crack
in cylinder block. Small crack can be closed with
Radiator
or Block Sealer

G-21. COOLING SYSTEM SPECIFICATIONS

Radiator
Cap:
Relief
Pressure

Vacuum
Valve Release.
Thermostat:
Rating

Starts to Open

Fully
Open

Water
Pump:
Type.

Drive

Radiator:

Type

Cooling System Capacity: Without Heater

With
Heater..

Fan:
Number of Blades Diameter

Drive
Belt: Angle of V

Length
Width
HURRICANE
F4
7 and 15 psi. [0,5 kg-cm2 and 1,05 kg cm2]
lA to 1 psi. [0,04 a 0,07 kg-cm2]

190°F.
[87,8°C]
180°F.
[82°C]

202°F.
[94°C]

Centrifugal
V-Belt

Tube
8s Fin
11 qt. [10,4 ltr.] 12 qt. [11,5 ltr.]
15" [38 cm.]
38°

42%" [108 cm.] [1,74 cmJ
DAUNTLESS
V-6 15 psi. [1,05 kg-cm2]
1 psi. [0,07 kg-cm2]

190°F.
[87,8°C]
180°F.
[82°C]

202°F.
[94°C]

Centrifugal
V-Belt

Tube
& Fin
9 qt. [8.5 ltr.]
10 qt. [9,4 ltr.]
4

\SbA"
[39,7 cm.]

38°

43.92"
[111,5
cm.] Vg"
[0.952
cm.] G-22. ANTIFREEZE CHERT

Quarts
i
Quarts
Ethylene Glycol

U.S.
Imperial
Liters
Fahr.
Cent.

10-Quart
System

2
m
2

16°
-
8.8°

3
2V2
2%
4°

-15.5°

4
3H
-12°

-24.4°

5 4M -34°

-36.6°

6
5

5Vs
-62°

-52.2°

11-Quart
System

2 2

18° -
7.6°

3 2H
2%
8°

-13.3°

4
3%
-
6°

:
-21.10

5 4M 4M -23°

-30.5°

6
5

SVs
-47°

-43.8°

12-Quart
System

2
1 m 2 1

19° ;
- 7.2°

3
2*A
10°
!
-12.2°

4
I
3H
3M 0°
;
-17.7°

5 !
4M 4^ :
-15°

s
-26.1°

6 1 5
5%
-34°

-36.6°
170

H

ELECTRICAL
SYSTEM
colder plug may be desirable. However, under- or
over-heating is usually caused by factors other than the type of
spark
plugs and the cause should be determined before changing plugs. The design of the
engine
calls for plugs equivalent to Champion

J-8
for F4
engines
and
A.C.
44S or
UJ12Y
Champ­

ion for the V6 engines, (as installed in production)
though any factor that consistently affects
engine
operating temperature may cause this requirement
to change. Overheating may be caused by in­ sufficient tightening of the plug in the head, which interferes with the flow of heat away from the firing

tip.
If this is the case, the plug gasket
will
show very
little flattening. Over-tightening, in
turn,
will
pro­ duce too easy a heat flow path and result in cold
plug operation.
This
will
be evident by excessive
flattening
and
deformation of the gasket.
Prevailing
temperatures, condition of the cooling system, and

air-fuel
mixture can affect the
engine
operating temperature and should be taken into consideration.
H-34.
GENERATOR
— F4
ENGINE

The
generator is an air-cooled, two-brush unit

which
cannot be adjusted to increase or decrease output. For replacement,
voltage
regulator and generator must be matched for
voltage
and capa­

city,
polarity, and common source of manufacture.
Otherwise,
either a
loss
of ampere capacity or a

burned
out generator
will
result. Generators for

these
vehicles are 12-volt. Par. H-l explains the 12-volt system. Refer to the specifications at the
end of this section for information on correct generator rating for a specific model series.
The
circuit
breaker,
voltage
regulator, and current-

limiting
regulator are built into one combination

unit.
Because the regulator and battery are part
of the generator
circuit,
the output of the generator
depends upon the
state
of charge and temperature
of the battery.
With
a discharged battery, the
output
will
be high, decreasing proportionally as the battery
becomes
charged. For service informa­
tion covering current regulator see Par. H-41.

H-36.
Generator
Maintenance

A
periodic inspection should be made of the charg­
ing
circuit,
Fig. H-l9. The interval
between
these
checks
will
vary
depending upon type of service.
Dust,
dirt
and high speed operation are factors 10541

FIG.
H-19—CHARGING
CIRCUIT

1—
Battery
4-—Starter Switch

2—
Voltage
Regulator 5-—Charge Indicator

3—
Generator
which
contribute to increased wear of bearings

and
brushes.

Under
normal conditions a check should be made
each 6000 miles
[9.600
km.].

A
visual inspection should be made of all wiring,
to be sure there are no broken or damaged wires.

Check
all connections to be sure they are tight and

clean.

Should
the commutator be rough or worn the
armature
should be removed and the commutator

turned
and undercut. See Par. H-37.
The
brushes should slide freely in their holders.

Should
they be oil soaked or if they are worn to

less
than one-half their original length they should
be replaced. When new brushes are installed they should be sanded to provide
full
contact with the
commutator. Generators should not be checked for
output until the brushes are seated.

Brush
spring tension is important. High tension causes
rapid
brush and commutator wear while
low tension causes arcing and reduced output.
Test
the tension with a spring scale.
Check
the
specifications section at end of this section for

correct
spring tension for generator in question.
H-36.
Generator Disassembly
•
Refer to Fig. H-20:
Before beginning disassembly of the generator to

correct
electrical system malfunctions proceed with
inspection and
test
procedures as detailed in Par.

H-46
thru
H-62. If it is definitely determined that trouble exists within the generator, which ne­cessitates dismantling, proceed as follows. Remove the two frame screws in the commutator
end plate and remove the end plate assembly. Next
pull
the armature and drive head complete

from
the generator housing. Remove the generator pulley from the armature by removing the nut

and
washer. Do not
lose
the Woodruff key when
the pulley is removed. After this, remove the drive
end head assembly which includes the oil seal and
bearing.
To remove the bearing, remove the three
screws and lockwashers in the grease retainer and remove the retainer and felt washer, after which,
remove the bearing, oil guard and felt washer.
H-37.
Armature

If
the commutator is rough or worn,
turn
it down

in
a lathe. After turning, the mica insulation be­ tween the
segments
should be undercut to a depth of 34* [0,8 mm.].
To
test
the armature for a ground, connect one

prod
of a
test
lamp to the core or shaft (not on

bearing
surface) and touch each commutator
seg­
ment with the other prod. If the lamp lights, the

armature
segment
is grounded and the armature must be replaced.

To
test
for short in armature coils, a growler,

Fig.
H-21, is necessary. Place the armature on the growler and lay a thin steel strip on the armature

core.
The armature is then rotated slowly by hand

and
if a coil is shorted, the steel strip
will
vibrate.

Should
a coil be shorted the armature must be
replaced.

If
precision
test
equipment is available, the cus­

tomary
accurate
tests
can be made in accordance 188

'Jeep'
UNIVERSAL
SERIES SERVICE
MANUAL

ALPHABETICAL INDEX

SUBJECT PAR.
SUBJECT
PAR.

Abbreviations,
List
U-17 Accelerator Linkage E-70
Air
Cleaner B-25, B-26, B-82, C-21, E-69

Air
Delivery Manifold Fl-4, F2-12
Air
Filter, Pump • F2-3, F2-11

Air
Injection Tubes Fl-5, F2-13
Air
Pump Fl-2, F2-10
Alternator Bearings B-76, H-80
Alternator Brushes H-74, H-75
Alternator Charging System •
•
H-63
Alternator
Diodes
H-69, H-85
Alternator Precautions H-64 Alternator Rotor H-76, H-79
Alternator Tests H-67, H-77 Alternator Specifications H-l 52
Alternator Stator H-84
Anti-Backfire
Valve Fl-6, F2-14
Antifreeze
Chart
• G-22 Antifreeze
Solutions
- G-16
Axle Camber O-l
Axle Caster 0-8

Back-Up
Lights H-135

Ballast
Resistor. H-32 Battery C-3, H-2 Bendix Folo-Thru Drive H-105, H-106
Bleeding Brakes P-7
Body T-l Body Lubrication. B-65 Body Name Plates ' A-7

Brake
Adjustment P-14
Brake
Drums. • .P-17

Brake
Hoses
P-8

Brake
Maintenance . P-5
Brake
Master Cylinder B-40, P-2, P-20

Brake
Service P-6
Brake
Wheel Cylinder • P-21

Camber
Adjustment 0-7
Camshaft D-6, D-51, D-52, D-53, D-81, Dl-26, Dl-33, Dl-55, Dl-80

Carburetor
E-10, E-25

Carburetor
Adjustment C-25, E-14, E-40,
Fl-13,
F2-16
Carburetor
Specifications .Fl-38, F2-34, E-79

Caster
Adjustment 0-8

Charging
System Service. .H-34, H-63

Chassis
Lubrication B-7, B-83

Chassis
Torque Specifications U-14

Clutch
1-4, MO
Clutch
Adjustment 1-3
Clutch
Linkage B-44, 1-3

Clutch
Maintenance .. 1-2
Clutch
Release Bearing B-74, 1-25

Coil
C-20, H-19, H-31 Connecting Rod Bearings D-47, D-48, D-49, Dl-49 Connecting Rod
Crank
Pins D-42
Connecting Rods... .D-20, D-50, D-95, Dl-31, Dl-45, Dl-75
Controls B-59, B-62
Cooling System B-28, G-l Cooling System Filling G-2

Core
Hole Expansion Plugs D-72

Crankcase
Ventilating System B-13, C-6, D-110

Crankshaft
D-26, D-38, D-39, Dl-38, Dl-73
Crankshaft
End Play. D-83, Dl-74

Crankshaft
Main Bearing D-43, D-44, Dl-32, Dl-40, Dl-73

Crankshaft
Oil Seal, Front Dl-21, Dl-85
Crankshaft
Oil Seal, Rear D-63, D-85, Dl-72

Cylinder
Block D-32, Dl-34

Cylinder
Bores D-35, Dl-36

Cylinder
Head D-17, D-73, D-98, Dl-24, Dl-63, Dl-82

Cylinder
Head Torque. C-5
Dash Pot Adjustment C-26, E-44
Differential B-51 thru B-53, N-9 Differential Adjustments N-16, N-18
Differential, Powr-Lok N-20
Differential,
Trac-Lok
N-24
Directional Signal Lights. . H-138
Distributor B-14, B-15, C-10, D-13, Dl-9, H-9, H-20 Distributor Check H-l7, H-28
Distributor Point Dwell C-17 Distributor Resistance Test C-16

Drawbar
.R-6, U-16
Dual
Brake System P-l thru P-26

Electrical
Instruments H-l22

Electrical
Specifications .H-l52

Electrical
System H-l Engine .
..D-l,
Dl-1
Engine Code Number A-6
Engine Compression .
.
C-9 Engine Disassembly . • .D-6, Dl-5 Engine Installation D-105, Dl-102
Engine Lubrication System B-4, B-6 Engine Mountings D-3, Dl-3
Engine Oil B-9
Engine Oil Filter B-10, B-ll,
D-lll,
Dl-13, Dl-93
Engine Oil Pan D-l9, D-66, D-97, Dl-29, Dl-51, Dl-77 Engine Oil Pump. . .D-14, D-65, D-93, Dl-19, Dl-50, Dl-87
Engine Overheating. G-l9 Engine Removal D-5, Dl-4.

Exhaust
Emission Control — F4 Fl-1 thru Fl-30
Exhaust
Emission Control — V6 F2-1 thru F2-36
Exhaust
Manifold, Install F-6

Exhaust
Pipe -
•
F-8

Exhaust
System F-2, F-3

Exhaust
System Maintenance F-4

Fan
Belt C-27, Dl-11, Dl-96, G-18
Floating Oil Intake. D-64, Dl-30, Dl-50, Dl-76 Flywheel D-25, D-67, D-87, Dl-28, Dl-52, Dl-78
Flywheel Housing. D-71, D-88, Dl-27, Dl-54, Dl-79
Flywheel Pilot Bushing D-70, 1-8

Frame
R-l

Frame
Alignment. R-2
Frame
Dimensions R-3
Frame
Straightening R-4

Front
Bumper Weight. • U-9
Front
Axle B-50, M-2

Front
Axle Alignment R-5

Front
Axle Installation • M-12
Front
Axle Maintenance M-3

Front
Axle Shaft Removal M-5

Front
Axle U-Joint B-54, B-55, M-7

Front
Axle Steering Knuckle M-&

Front
Wheel Alignment 0-4

Front
Wheel Bearings B-56, B-57, Q-4
Front
Wheel Toe-in 0-5, 0-6

Front
Wheel Turning Angle 0-9
Fuel
Gauge Float Unit F-76

Fuel
Lines - E-77

Fuel
Pump E-45, E-54, E-60, E-67
Fuel
Pump Check C-23

Fuel
Tank
E-72

G

Gauges, Testing H-l24

General
Specifications A-8
Generator B-16, H-34 thru H-40

Glass
Replacement • T-4
Governor. . .
•.
• U-3
Guides, Valve D"61

H

Hazard
Warning Lights H-139
Head Lamp Aiming H-131, H-132 Head Lamp Replacement H-130
Headlight Dimmer Switch H-l
2
7

Heat Control Valve C-7, F-7 Heated Air System • •
•
F2-2
Heater U-10
Horns.....
....H-137 371