engine JEEP CJ 1953 Owner's Guide

'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL

C

FIG.
C-22—-CHECKING
FUEL
PUMP
PRESSURE
—
DAUNTLESS
V-6
ENGINE a
couple of strokes to be sure the pump is primed.

Using
a half-pint
bottle
or similar measure, pump
Vi
pint [0,24 It] of fuel by cranking the
engine

with
the starter motor. Count the strokes neces­
sary
to
fill
the measure. If more than 20 strokes

are
required, the fuel pump is inefficient, the tank
line is leaking air, or the fuel supply is restricted.

Check
fuel filter in the fuel tank if line is restricted.

C-24.
Check Manifold Vacuum

To
check the intake manifold vacuum on the
Hurri­

cane F4 engine, remove the ventilation valve and

L
fitting from the manifold and install special adapter. On the Dauntless V-6
engine
remove the
pipe plug located in the right
rear
of the intake
FIG.
C-23—CHECKING MANIFOLD VACUUM
—

HURRICANE
F4
ENGINE
manifold and install special adapter. Connect the

vacuum
gauge
tube to the special adapter as shown

in
Fig. C-23 for the
Hurricane
F4 engine.

Start
the engine. Connect a Tachometer
Tool,

C-3896,
from the distributor
primary
terminal to ground and set the
engine
speed at the specified

rpm.
given in Par. C-30. Observe the vacuum
read­

ing and interpret as follows:

a.
A steady reading from 18" to 20" [457 a 508
mm.] of mercury is a normal reading, indicating
that valve and
spark
timing, valve seating, and
piston ring sealing are all satisfactory.
b. A steady but below normal reading indicates

a
condition common to all cylinders such as a

leak
at the carburetor gasket, late ignition or valve
timing, or uniform piston ring and bore wear.

c.
A slowly fluctuating or drifting reading in­ dicates that the carburetor idle mixture is incorrect

Look
for the cause in the fuel system.

d.
A rhythmic pulsating reading is caused by a
condition affecting one or more cylinders, but not

all,
and indicates leaky valve, gasket blowby, re­
stricted intake port, or an electrical miss.
e. An intermittent pulsating reading is caused by

an
occasional malfunction, such as a sticking valve
(all
valves may be
erratic
in operation if the valve
springs are weak), electrical miss caused by insuffi­
cient distributor point tension or low coil
voltage

coupled with inconsistent
spark
plug
gaps
or fouled
plugs, or
dirt
in the fuel system finding its way into
passages of
critical
size or valve
seats
in the
car­

buretor.

f.
A normal reading that quickly falls off (with

engine
running at
2000
rpm.) indicates exhaust
back
pressure caused by a restriction in the exhaust
system.

g.
Make indicated corrections to bring vacuum to 18" to 20" [457 a 508 mm.] of mercury normal

reading.

C-25.
Carburetor Adjustments

•
Refer to Fig. C-24, C-25 and C-26.

Carburetor
adjustments should not be attempted

until
it is known that
engine
ignition and com­
pression are in
good
order. Any attempt to adjust

or
alter the carburetor to compensate for faulty conditions elsewhere
will
result in reduced econ­
omy and overall performance.

Caution:
If an
engine
is idling too slow or rough,
this may be caused by a
clogged
ventilator valve

or
hose;
therefore, never adjust the carburetor idle
without first checking the crankcase ventilator
check valve and
hose.

The
air cleaner must be left in place while making
idle speed and mixture adjustments. All lights and accessories, must be turned off. The positive
crank­

case ventilator system should also be in
good
oper­
ating condition when making carburetor adjust­ ments.
Either
of
these
items noticeably affects the

air
fuel ratio at idle.

•
Hurricane
F4 Engine.
Note:
The idle mixture adjustment procedure for
the late model
YF-4941S
and
YF-6115S
Carter

31

c

TUNE-UP
Carburetor
equipped with the
External
Idle Mix­
ture
Limiter
Cap is the same as outlined below
in
Pars.
"A"
through
"D";
however, because of the
Idle
Limiter
Cap,
the idle mixture screw
CANNOT

be adjusted in the counter-clockwise
(rich)
direc­
tion. The adjustment is made from the
rich
stop
position and the mixture screw is turned in (clock­
wise) approximately 3A turn to
"Lean
Best Idle."

Refer
to Fig. C-25.

The
"Lean
Best Idle" method of idle setting is as follows:

a.
Any scheduled service of ignition system should
precede this adjustment.

b.
Connect tachometer or vacuum
gauge
to engine.

c.
Warm
up
engine
and stabilize temperatures.
d.
Adjust
engine
idle to speed desired, using throt­
tle idle speed adjusting screw.

e.
Carburetors without Idle
Limiter
Cap turn idle
mixture screws out (counterclockwise) until a
loss
of
engine
speed is indicated; then, slowly turn mix­
ture screw in (clockwise-leaner) until maximum speed (RPM) is reached. Continue turning in (clockwise) until speed
begins
to drop; turn mix­
ture adjustment back out (counterclockwise-richer)

until
maximum speed is just regained at a "lean as possible" mixture adjustment. Refer to
Fig.
C-24.
FIG.
C-24—CARBURETOR —
HURRICANE F4 ENGINE,
EARLY
MODEL 1—
Choke
Clamp Bracket
2—
Choke
Shaft and
Lever
Assembly

3—
Fuel
Inlet Elbow
4—
Bowl
Vent Tube 5— idle Air Adjusting
Needle
6—
Throttle
Lever
and Shalt Assembly
7—
Idle
Speed Adjusting Screw
8—
Fast
Idle Connector Rod
FIG.
C-25—CARBURETOR —
F4 ENGINE,
LATE
MODEL 1—
Choke
Clamp Bracket
2—
Throttle
Lever
and Shaft

3—
Choke
Shaft and
Lever

4 Bowl Vent Tube 5—
Fuel
Inlet Elbow 6—
Dash
Pot Bracket 7—
Throttle
Lever
8—
Dash
Pot Plunger
9—
Dash
Pot Assembly
10—
Lock
Nut
11— Stop Pin
12—
Idle
Mixture
Limiter
Cap 13—
Idle
Speed Adjusting Screw
14—
Fast
Idle Connecting Rod
Note:
When adjusting the mixture screw never
seat the screw tight during the adjustment proce­

dure
as this can damage the screw needle.

•
Dauntless V-6 Engine.

The
"Lean
Best Idle" method of idle setting is
as follows:
a.
Any scheduled service of ignition system should
precede this adjustment.
b. Connect tachometer to engine.

c.
Warm
up
engine
and stablize temperatures.
d.
Adjust
engine
idle to speed desired, using throt­
tle idle speed adjusting screw.
Note:
The
Carter
YF-6115S
Carburetor
has a throt­
tle return spring attached from the carburetor

main
body to the carburetor throttle shaft The purpose of this spring is to return the throttle
to idle speed position should a linkage failure
occur.
FIG.
C-26—CARBURETOR —
DAUNTLESS V-6 ENGINE 1—
Fuel
Inlet
2—
-Choke
Housing

3—
Choke
Cable Bracket
4—
Idle
Speed Adjusting Screw
5—
Idle
Fuel-Air
Mixture Screws 32

'Jeep*
UNIVERSAL
SERIES
SERVICE
MANUAL

C

FIG.
C-2
7—FAN
BELT
—
DAUNTLESS
V-6
ENGINE
e. Adjust mixture by turning idle mixture screws
out (counterclockwise) until a loss of engine speed
is indicated; then, slowly
turn
both mixture screws

in
clockwise (leaner) until maximum speed (RPM)
is reached. Continue turning in (clockwise) until a slight drop in speed (RPM) is noted. Make certain
both mixture screws are adjusted equally.
This
will

ensure a "lean as possible" mixture adjustment.

Readjust
idle
stop
screw to idle engine at the
specified
R.P.M.

Note:
This
method of adjusting idle mixture must
be used to keep hydrocarbon and carbon monoxide
emissions to a minimum.

Note:
No fast idle speed adjustment is required.

Fast
idle is controlled by the curb idle speed ad­ justment screw. If the curb idle speed is correctly set, the fast idle speed
will
be correct.
C-26.
Dash
Pot
Adjustment

Refer
to Section
E, Par.
E-44 for proper carburetor

dash
pot adjustment procedure.

C-27.
Check
Fan
Belt

The
fan belt drives the fan, alternator, and water

pump.
See Fig. C-27.

Inspect
the fan belt for serviceability and proper
tension. The tension should be checked with the
Belt
Tension Gauge, W-283. The correct tension on a used belt is 70 to 80 pounds [31,7 a 36,2 kg.]

and
on a new belt 110 to 120 pounds [49,8 a 54,5 kg.]. When preparing for delivery of new car,
the belt strand tension should be 80 to 110 pounds [36,2 a 49,8 kg.]. When installing a new belt, adjust
the strand tension 110 to 120 pounds [49,8 a 54,5 kg.].

Adjust
the fan belt tension by loosening the clamp
bolt on the alternator brace and swinging the alter­

nator
away from the engine until proper belt ten­
sion is obtained.
Then
tighten the clamp bolt.

Note:
If no
gauge
is available approximate correct
tension is obtained when the thumb pressure mid­
way between the pulleys causes the belt to flex
y%
inch
[IV4
cm.].

C-28.
ROAD TEST VEHICLE

After
completing the tune-up, road
test
the vehicle for power and overall performance. Make neces­
sary
adjustments.

Note:
Engine run on or "dieseling" is a condition

in
which combustion continues to take place after
the normal ignition
spark
from the distributor has
been shut off by turning off the ignition switch. It is generally caused by excessive engine idle speed

in
combination with retarded ignition timing, en­ gine heat soak or the use of low octane fuel.

Should
engine dieseling (engine running after igni­
tion key is turned off) be experienced on V-6 engine equipped vehicles, installation of Idle Stop
Valve
Kit
Part
No. 991722
will
correct the

difficulty.
33

TUNE-UP

C-29.
SERVICE
DIAGNOSIS

POOR
FUEL ECONOMY Ignition Timing Slow or Spark Advance Stuck

Carburetor
Float High
Accelerator Pump Not Properly Adjusted High Fuel Pump Pressure

Fuel
Leakage

Leaky
Fuel Pump Diaphragm Loose Engine Mounting Causing High Fuel Level in Carburetor

Low
Compression
Valves Sticking
Spark
Plugs Bad

Spark
Plug Cables Bad
Weak
Coil
or Condenser Improper Valve Tappet Clearance

Carburetor
Air Cleaner Dirty
High Oil Level in Air Cleaner Dragging Brakes

Front
Wheels Out of Alignment

Tires
Improperly Inflated Inaccurate Odometer

Faulty
Fuel Tank Cap
Clogged
Muffler or Bent Exhaust Pipe Sticking Exhaust Manifold Valve

LACK
OF POWER
Low
Compression Ignition System (Timing Late)
Improper Functioning Carburetor
or Fuel Pump

Fuel
Lines
Clogged

Air
Cleaner Restricted Engine Temperature High Improper Tappet Clearance
Sticking Valves
Valve Timing Late

Leaky
Gaskets
Muffler
Clogged

Bent Exhaust Pipe Sticking Exhaust Manifold Valve —
Dauntless V-6 Engine

LOW
COMPRESSION
Leaky
Valves Poor Piston Ring Seal Sticking Valves
Valve Spring Weak or Broken
Cylinder
Scored or Worn
Tappet Clearance Incorrect Piston Clearance too Large

Leaky
Cylinder Head Gasket

BURNED
VALVES AND SEATS Sticking Valves or too Loose in Guides
Improper Timing
Excessive Carbon Around Valve Head and Seat Overheating
Valve Spring Weak or Broken
Valve Tappet Sticking
Valve Tappet Clearance Incorrect
Clogged
Exhaust System

Defective
Valve
Lifter
— Hydraulic
VALVES
STICKING
Warped Valve Improper Tappet Clearance Carbonized or Scored Valve
Stems

Insufficient Clearance Valve Stem to Guide
Weak or Broken Valve Spring Valve Spring Cocked Contaminated Oil

OVERHEATING
Inoperative Cooling System
Theromstat Inoperative Improper Ignition Timing
Improper Valve Timing
Excessive Carbon Accumulation
Fan
Belt too Loose

Clogged
Muffler or Bent Exhaust Pipe
Oil
System Failure Scored or Leaky Piston Rings
Sticking Exhaust Manifold Valve — Dauntless V-6 Engine

POPPING-SPITTING-DETONATION
Improper Ignition Improper Carburetion
Excessive Carbon
Deposit
in
Combustion Chambers
Poor Valve Seating Sticking Valves
Broken Valve Spring Tappets Adjusted too Close
Spark
Plug Electrodes Burned
Water or Dirt in Fuel
Clogged
Lines Improper Valve Timing

Clogged
Fuel Filter Sticking Exhaust Manifold Valve —
Dauntless V-6 Engine

EXCESSIVE
OIL CONSUMPTION Piston Rings Stuck in Grooves, Worn or Broken Piston Rings Improperly Fitted or Weak Piston Ring Oil Return
Holes
Clogged

Excessive Clearance, Main and
Connecting Rod Bearings

Oil
Leaks at Gaskets or Oil Seals
Excessive Clearance, Valve Stem
to Valve Guide (Intake)

Cylinder
Bores Scored, Out-of-
Round or Tapered
Too Much Clearance, Piston to Cylinder Bore
Misaligned Connecting Rods
High Road
Speeds
or Temperature
Crankcase
Ventilator Not Operating

BEARING
FAILURE
Crankshaft
Bearing Journal Out-of-Round

Crankshaft
Bearing Journal Rough

Lack
of Oil
Oil
Leakage

Dirty
Oil

Low
Oil Pressure or Oil Pump Failure

Drilled
Passages
in Crankcase or Crankshaft
Clogged

Oil
Screen Dirty
Connecting Rod Bent 34

C-30.
TUNE-UP
SPECIFICATIONS

ITEM

BATTERY:
Voltage
Terminal
Ground Specific Gravity:
Fully
Charged Recharge at

Load
Test, minimum:
12-Volt Battery. .

SPARK PLUGS:

Make and Model

Gap

Tightening Torque

COMPRESSION
PRESSURE CRANKING:

VALVES:
Tappet Clearance Cold:
Intake
Exhaust:
Timing (Intake Opens)

DISTRIBUTOR
Model
Dwell
Angle
Point Gap
Arm
Spring Tension

Firing
Order and Direction ....

IGNITION TIMING.
Mark
Location

ENGINE
IDLE
SPEED: W/O
Exhaust Emission Control With Exhaust Emission Control
F4
W/Dist. IAY-4401A

F4
W/Dist. IAY-4401B

FIRING
ORDER HURRICANE
F4

DAUNTLESS
V-6
12 Volts

Negative

1.260 1.225
10 Volts

AC
45 or Champion J-8 .030"
[0,762
mm.]
25 to 33
lb-ft.
[3,5 a 4,6
kg-m.]

120 to 130 psi. [8,4 a 9,2
kg-cm2]

.018"
[0,460
mm.] .016"
[0,406
mm.]
9°
BTC

PRESTOLITE

IAY-4012
IAY-4401A

IAY-4401
IAY-4401B

42°

.020"
[0,508
mm.]
17 to 20 oz.
[0,482
@
0,567
gr.]

1-3-4-2
Counterclockwise

5° BTC
0° TDC
Vibration Damper or Timing Cover
600 rpm.

1-3-4-2
650/700
rpm.

700/750
rpm. 12 Volts

Negative

1.260 1.225
10 Volts

AC
44S or Champion UJ12Y .035"
[0,889
mm.]
25 to 35
lb-ft.
[3,5 a 4,8
kg-m.]

Zero (Hydraulic Lifters)
Zero (Hydraulic Lifters)
DELCO-REMY

1110376
PRESTOLITE

IAT-4501 IAT-4502A
IAT-4502
30°

19 to 23 oz.

[0,538
@
0,652
gr.'

5°
BTC
29°
± 3°
.016"
[0,401
mm.] 17 to 22 oz.
[0,482

1-6-5-4-3-2-
Clockwise
5°
BTC
Timing Cover

650/700
rpm.
650/700
rpm.

1-6-5-4-3-2
%
0,624
gr.]

0°
TDC
NOTE:
FOR
VEHICLES
EQUIPPED WITH EXHAUST
EMISSION
CONTROL, ALSO
REFER
TO
SECTION
Fl (F4-134
ENGINE)
AND
SECTION
F2
(V6-225
ENGINE).
Co O

'Jeep9
UNIVERSAL SERIES SERVICE
MANUAL

D HURRICANE
F4
ENGINE

Contents

SUBJECT
PAR.

GENERAL...
D-l Description D-2

Engine
Ground Strap D-4

Engine
Mountings D-3

ENGINE REMOVAL
D-5
ENGINE DISASSEMBLY
D-6
Camshaft
.......
D-28
Clutch
D-24

Crankshaft.
D-26
Crankshaft
Pulley. D-l2
Cylinder
Head. .D-17
Distributor.
.D-13

Exhaust
Manifold D-8
Exhaust
Valves and Springs D-2
7

Flywheel.
. D-25
Front
End Plate D-23
Oil
Filler
Tube D-9

Oil
Gallery Plugs D-30

Oil
Pan. . ...D-19

Oil
Pump D-l4
Piston and Connecting Rods. . . D-20
Ream
Cylinder Bore Ridges. D-l8

Rocker
Arm Assemblies D-l6 Thermostat D-ll

Timing
Gear
Cover . . D-21

Timing
Gears D-22

Valve
Tappets D-29
Ventilation Valve D-l5
Water
Outlet Fitting D-10

Water
Pump D-7

ENGINE INSPECTION
AND
REPAIR.
.D-31
Camshaft
and Bearings. D-51
Camshaft
End-Play
. . .D-53

Camshaft
Front Bearing Replacement..... D-52
Checking
Connecting Rod
Crank
Pins D-42

Checking
Crankshaft Alignment .
.
D-40
Checking
Main Bearing Journals. D-41

Cleaning.
. D-33 Connecting Rod Bearing Inspection D-48
Connecting Rod Bearings D-47 Connecting Rod Side Play D-50

Core
Hole Expansion Plug D-72
Crankshaft
.
.
D-38, 39

Crankshaft
Main Bearing Inspection D-44

Crankshaft
Main Bearings D-43

Crankshaft
Rear
Bearing Seal D-63
Cylinder
Block D-32

Cylinder
Bores D-35

Cylinder
Head. . . D-73

Exhaust
Valve Seat Insert Replacement. .
.
D-60
Fitting
Crankshaft Main Bearings

Using
Plastigage
D-45

Fitting
Crankshaft Main Bearings
Using
Shim Stock D-46

Floating
Oil Intake D-64

Flywheel.
. . .D-67

Flywheel
Housing D-71
SUBJECT
FAR.

Flywheel
Inspection. D-6 8

Flywheel
Pilot Bushing D-70 Inspection D-3 4
Inspection of Valves, Springs and Guides. .D-57
Installing
Connecting Rod Bearings....... D-49

Oil
Pan D-66
Oil
Pump D-65
Piston Ring Application
Chart
D-3 7
Pistons, Rings, and Connecting Rods..... D-36

Refacing
Valves
.
D-58

Ring
Gear
Replacement D-69
Rocker
Arm Shaft Disassembly. D-75, 76

Rocker
Arm Shaft Reassembly.
.
D-77
Rocker
Arms D-74
Tappets and Cover. . D-62
Timing
Gears and Cover D-54, 55

Valve
Guide Replacement D-61
Valve
Seat Inspection and Refacing D-59

Valve,
Springs and Guides D-56

ENGINE REASSEMBLY
D-78
Camshaft
and
Thrust
Plate .D-81
Camshaft
Timing
Gear
D-91

Check
Crankshaft
End-Play.
............D-83
Clutch.
...D-89

Crankshaft
and Bearings................ D-82

Crankshaft
Pulley D-96

Crankshaft
Rear
Bearing Seal.. .
.
D-85
Crankshaft
Timing
Gear
D-84

Cylinder
Head D-98
Distributor
D-l
00

Flywheel
®. . .. D-87
Flywheel
Housing D-88

Front
End Plate D-86
Manifold.......
D-101

Oil
Filler
Tube D-102

Oil
Gallery Plug. D-79
Oil
Pan. D-97

Oil
Pump D-93
Pistons and Connecting Rods D-95
Rocker
Arm Assembly D-99

Spark
Plugs. .D-100
Tappets D-80
Timing
Gear
Cover D-94

Timing
Gear
Oil Jet D-92

Valves
and Springs ... D-90

Water
Outlet Fitting D-104
Water
Pump D-103

ENGINE INSTALLATION.
............D-105

FINAL IN-VEHICLE
ADJUSTMENTS.
.D-106
Check
Valve Timing . . D-109
Crankcase
Ventilation Valve. D-l 10

Oil
Filter
, . .
...D-lll

Valve
Adjustment D-107

Valve
Adjustment Procedure D-l08

SERVICE
DIAGNOSIS
D-112

SPECIFICATIONS D-l
13 37

HURRICANE
F4
ENGINE

D-1.
GENERAL

This
section describes service and repair of the
F4
engine. The
engine
code
number shown in Fig.
A-3
is provided to identify the four cylinder engine.
The
meaning of the coded letters and numbers that

are
stamped on the water pump boss, at the front of the cylinder block, is given below.
Letter
to
Designate
Market

M
—
Military
E
—
Export

D
— Domestic
I
—
Industrial
&
Marine

Letter
to
Designate
Engine
Letter
to
Designate
Year
Built
R
— 1969

S
— 1970

T
— 1971
U—
1972

V
— 1973

W
— 1974

Numbers
to Designate
Compression
Ratio

F
— F4-134
Engine
63
67
•

71
-
6.3 to 1

•
6.7 to 1

-
7.1 to 1

Market
-
D
S F

(Domestic)

(1970)

Engine-
EXAMPLE

123 A B S
(F4-134)

Day- "L

Compression
Ratio

(6.7)
-
Service Engine (S)
Short
Block
(R)

-.010*
Oversize Pistons

(123rd)
-.010*
Undersize
Main

and
Rod Bearings
All
disassembly and assembly procedures are
presented in logical order, assuming a complete

engine
overhaul with
engine
removed from the vehicle. However, many of
these
procedures can
also be performed as on-vehicle services if vehicle
or
engine
components are removed to gain access
to parts involved.

Note:
Some
engines
are equipped with an exhaust
emission control system. Service information on
the components of this system is given in Section

F-l.
D-2.
Description

The
Hurricane
F4-134
engine
is an F-head, four-
cyiinder
engine
of combination valve-in-head and valve-in-block construction.
Large
intake valves
mounted in the head allow
rapid,
unobstructed
flow of fuel and air to the combustion chambers through short, water-jacketed intake passages.The
intake valves are operated by push rods through

rocker
arms. The exhaust valves are mounted

in
the block with through water jacketing to provide
effective
cooling. The exhaust valves are
operated by conventional valve tappets.
The
engine
is pressure lubricated. An oil pump

driven
from the camshaft forces the lubricant
through oil channels and drilled passages in the

crankshaft
to efficiently lubricate the main and
connecting rod bearings.
Lubricant
is also force
fed to the camshaft bearings, rocker arms, timing
gears, etc.
Cylinder
walls and piston pins are

lubricated
from spurt
holes
in the "follow" side of
the connecting rods.
Circulation
of the coolant is controlled by a
thermostat in the water
outlet
elbow cast as part
of the cylinder head.

The
cylinder head assembly when installed on the

engine
consists of the inlet valve guides, inlet valves, inlet valve springs, rocker arm and shaft assemblies, spark plugs, temperature indicator
fitting, water
outlet
fitting, and other assembled

parts.
The carburetor and air cleaner assembly
bolt to the top of the cylinder head. The rocker

arm
cover is attached to the top of the head to
enclose
the inlet valve mechanism.
The
engine
is equipped with a fully counterbalanced
crankshaft
supported by three main bearings. To better control balance, the counterweights are in­
dependently forged and permanently attached to
the crankshaft with dowels and cap screws that are tack-welded.
Crankshaft
end play is adjusted by
shims placed
between
the crankshaft thrust washer

and
the shoulder on the crankshaft.
The
exhaust manifold is a separate unit. The intake
manifold is cast as an integral part of the cylinder
head and is completely water jacketed.
This
con­
struction transfers heat from the cooling system
to the intake passages and assists in vaporizing
the fuel when the
engine
is cold. Therefore, there
is no heat control valve required in the exhaust manifold. Individual exhaust ports in the cylinder
block direct
gasses
into the exhaust manifold for unobstructed flow through the exhaust system.

The
pistons have an extra
groove
directly above
the top ring which acts as a heat dam or insulator.
As
is common practice with manufacturers,
some

engines
are built with oversize cylinder bores or undersize crankshaft journals. These
engines
are
considered standard as replacement parts of the

correct
sizes are supplied. Before ordering parts or
doing any work with a particular engine, it is important to check the
engine
code
number to
determine if oversize or undersize parts are re­

quired.
Definite identification is given by a letter
stamped after the
engine
code
number. See Fig.

A-5
for location. The letters used and their mean­ ings are given here:

A
— .010*
[0,254
mm.] undersize main and
connecting rod bearings.

B
— .010"
[0,254
mm.] oversize pistons.

AB
—
Combination
of A and B.

S
—
Service
engine.

R
—
Short
Block.
Detailed specifications for the
Hurricane
F4
engine

are
at the end of this section.
Torque
specifications
for
engine
service are at the end of this manual in Section U. When adjustments are necessary, refer to
these
specifications so that factory clearances

are
maintained.

D-3.
Engine Mountings

The
front of the
engine
is supported by two rubber
Text continued on
page
41. 38

'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL

FIG.
D-l—HURRICANE
F4-ENGINE
— END
SECTION
VIEW

1— Intake Valve Spring Retainer

2—
Adjusting
Screw
3—
Nut

4— Rocker Arm
5—
Push
Rod
6— Intake Valve Guide 7— Intake Valve
8— Exhaust Valve
9—
Cylinder
Head
Gasket

10— Exhaust Valve Guide
11— Exhaust
Manifold

12—
Exhaust Valve Spring

13—
Valve
Spring Cover
14—
Oil
Pump
Gear

15— Camshaft

16—
Oil
Pump
17—
Relief
Plunger

18—
Relief
Plunger Spring

19—
Relief
Spring Retainer

20—
Oil
Pan
21—
Drain
Plug

22—
Oil
Float Support

23—
Oil
Float

24—
Crankshaft

25—
Engine
Rear
Plate
26—
Cylinder
Block

27—
Connecting Rod

28—
Oil
Filler
Tube

29—
Piston

30—
Cylinder
Head

31—
Intake Valve Spring
.12—Carburetor 39

D
HURRICANE
F4
ENGINE ®
® ® ® ®

®
® @> ® ® ®® ® (§) 11759

FIG.
D-2—HURRICANE F4-ENGINE
—
SIDE SECTIONAL VIEW

1— Fan
2— Water Pump
3— Pipe Plug
4— Water Outlet Fitting 5— Thermostat
6— Piston
7— Rocker Shaft Bracket
8— Rocker Arm Shaft
9— Rocker Shaft Spring
10—
Spark
Plug
11— Rocker Shaft Lock Screw
12—
Exhaust
Valve 13— Intake Valve
14— Intake Valve Spring
15— Intake Valve Guide
16— Rocker Arm
17— Intake Tappet Adjusting Screw
18— Rocker Arm Cover 19—
Oil
Line
20—
Cylinder
Head
21— Intake Valve Push Rod
22—
Exhaust
Valve Guide
23—
Exhaust
Manifold
24—
Exhaust
Valve Spring
25—
Cylinder
Block
26— Piston Pin 27—
Exhaust
Tappet Adjusting Screw 28—
Engine
Rear
Plate

29— Camshaft
30— Flywheel 31—
Crankshaft
Rear Bearing Seal
32—
Crankshaft
Rear Bearing
33— Intake Valve Tappet
34—
Crankshaft

35—
Crankshaft
Bearing Dowel
36—
Oil
Float Support
37—
Oil
Float
38—
Crankshaft
Center Bearing
39— Connecting Rod Bearing
40—
Oil
Pan
41— Connecting Rod
42—
Crankshaft
Front Bearing
43— Engine Front Plate
44—
Crankshaft
Gear
45—
Crankshaft
Oil Seal
46— Drive Pulley
47—
Crankshaft
Gear Spacer 48—
Oil
Jet
49— Bolt 50— Camshaft Gear Thrust Plate Spacer

51—
Camshaft Thrust Plate
52— Camshaft Gear
53— Fan-and-Generator Belt 40