set clock JEEP CJ 1953 Service Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1953, Model line: CJ, Model: JEEP CJ 1953Pages: 376, PDF Size: 19.96 MB
Page 24 of 376
c
TUNE-UP
14011
FIG.
C-8—POSITIVE CRANKCASE VENTILATION VALVE
vacuum
hose
and insert a stiff wire into the valve
body and observe whether or not the plunger can be readily moved (Fig. C-8). The valve may be
cleaned, by soaking in a reliable carburetor clean
ing solution and drying with low pressure dry air.
b.
Hurricane
F4 Engine.
Ventilation
of the
Hurricane
F4
engine
is accom
plished in the same manner as the Dauntless V-6
engine
described above, the differences being that clean air enters the crankcase through a
hose
con nected
between
the top cover of the air cleaner and
the oil filler tube of the engine. The ventilation valve is screwed to a pipe fitting mounted in the
center of the intake manifold
between
number two
and
three cylinder inlet. A
hose
connects the venti
lation valve to a vapor
dome
on the rocker arm
cover. Service procedures are the same as
those
used on the Dauntless V-6 engine. The valve may be checked for vacuum
pull
by removing the
hose
from
the valve while running the
engine
at fast idle speed and placing a finger on the valve opening to
check the vacuum. (Refer to Fig. C-9).
C-7.
Service
Manifold
Heat
Control
Valve
The
Dauntless V-6
engine
is equipped with a manifold heat control valve (Fig. F-6). Test the valve
for free operation. Place a few drops of penetrating
oil
at each end of the shaft where it passes through
the manifold.
Then
move
the valve up and down
a
few times to work the oil into the bushing. When
the
engine
is cold, the valve should be in the closed
position to ensure a fast warm-up of the intake
manifold for better fuel vaporization. When the
valve is closed, the counterweight is in its counter clockwise position. As the
engine
warms the coun
terweight slowly rotates clockwise until the valve is fully open.
C-8.
Check
Valve
Tappet
Clearance
a.
Hurricane
F4 Engine.
With
the
engine
cold, check and adjust the intake
valve to .018"
[0,460
mm.] clearance and the ex
haust valves to .016" [0,406 mm.] clearance. The
intake valves are adjusted by removing the rocker
arm
cover mounted on the cylinder head.
Turn
the
engine
over until No. 1 cylinder piston is on top
dead center on its compression stroke, then using a
feeler
gauge
check the clearance
between
the valve stem and the toe of the rocker arm. If clearance is
less
or greater than .018"
[0,460
mm.] the valve
must be adjusted by turning the rocker arm nut
clockwise to decrease and counterclockwise to in crease the clearance. When No. 1 cylinder intake
valve has been properly set use the same proce
dures to check and reset, if necessary, the remaining
three cylinder valves. The exhaust valves are ad justed by removing the tappet cover located on
the right side of the engine. Place the cylinder to
be adjusted on top dead center (compression stroke) and check the clearance
between
the valve stem and tappet screw with a feeler
gauge.
If the
clearance is
less
or greater than .016" [0,406 mm.]
the valve must be adjusted by loosening the tappet
screw locknut and turning the screw until the proper clearance is obtained, then tighten the lock-
nut.
Note:
Always recheck the valve clearance after
tightening the locknut.
b. Dauntless V-6 Engine.
The
valve tappet clearance of the Dauntless V-6
engine
needs
no adjustment as the lifters are
hydraulic
and require no lash adjustment at time
of assembly or while in service.
C-9.
Check
Engine
Cylinder
Compression
a.
Hurricane
F4 Engine.
To
take the compression readings of the
engine
cylinders
remove all the
spark
plugs and disconnect
the high tension wire from the coil.
With
the throttle and choke open
turn
the
engine
with the
starter
motor while firmly holding the compression
gauge
in the
spark
plug port of the cylinder to be
checked. Allow at least four compression strokes
when checking each cylinder and record the first
and
fourth stroke reading of the
gauge.
When
pressure quickly
comes
up to specified pres
sure
and is uniform
between
all cylinders within 10 psi. [0,7 kg-cm2] it indicates that the
engine
is
operating normally with satisfactory seating of
rings,
valves, valve timing, etc.
When
pressure is low on the first stroke and builds
up to
less
than specified pressure it indicates com
pression leakage usually attributable to rings or
valves. To determine which is responsible, pour
Vz
oz. [15 cm3] of tune-up oil into each cylinder.
Allow
a few minutes for the oil to leak down past
the rings and then again
test
compression. If com
pression pressures improve over the first
test,
the trouble is probably worn piston rings and bores. If
compression pressures do not improve, the trouble
is probably caused by improper valve seating. If
this condition is noticed on only two cylinders that
are adjacent, it indicates that there is a possible gasket leak
between
these
cylinders. If inspection
of the
spark
plugs from
these
cylinders disclosed
fouling or surface cracking of electrodes, gasket leakage is probable.
When
pressure is higher than normal it indicates
that carbon
deposits
in the combustion chamber have reduced the side of the chamber enough to
give
the
effect
of a raised compression ratio.
This
will
usually cause a pinging sound in the
engine
when under load that cannot be satisfactorily corrected by timing. The carbon must be cleaned out
of the
engine
cylinders to correct this trouble.
Reinstall
the
spark
plugs. Torque with a wrench
to proper setting.
Advise
the vehicle owner if compression is not satisfactory. 24
Page 26 of 376
c
TUNE-UP
C-10.
Distributor
Service
The
distributor cap should be inspected for
cracks,
carbon runners and evidence of arcing. If any
of
these
conditions exists, the cap should be re
placed.
Clean
any corroded high tension terminals. Inspect the rotor for cracks or evidence of
exces
sive burning at the end of the metal strip. After
a
distributor rotor has had normal use the end
of the rotor
will
become
burned. If burning is found
on top of the rotor it indicates the rotor is too
short and
needs
replacing. Usually when this con
dition is found the distributor cap
segment
will
be burned on the horizontal face and the cap
will
also need replacing.
Check
the condenser lead for broken wires or
frayed
insulation.
Clean
and tighten the connec
tions
on the terminal
posts.
Be sure the condenser
is mounted firmly on the distributor for a
good
ground connection. Should a condenser tester be available the capacity
should be checked. In the absence of a tester check
by substituting a new condenser.
Examine
the distributor
points
(Fig.
C-ll).
If
they
show wear, poor mating, transferred metal, or pitting, then new
ones
should be installed.
Clean
the
points
with a suitable solvent and a stiff
bristled brush.
Check
the alignment of the point for a
full,
square
contact. If not correctly aligned, bend the station
ary
contact bracket slightly to provide alignment,
a.
Hurricane F4 Engine (Prestolite).
The
contact gap of the distributor point on the
Hurricane
F4
engine
should be set at .020"
[0,508
mm.],
measured with a wire
gauge.
Adjustment of
the gap is accomplished by
loosening
the lock screw and turning adjusting eccentric screw (Fig.
C-12)
until correct gap is secured. Be sure that the
fiber block on the breaker arm is resting on the
highest point on the cam while the adjustment is being made. Recheck the gap after locking the
adjustment.
Apply
a thin film of cam lubricant to the cam to
lessen fiber block wear. Should a condenser tester be available the capacity
should check from .21 to .25 microfarads. In the
absence of a tester check by substituting a new
condenser.
Check
point contact spring pressure, which should
be
between
17 and 20
ounces
[0,487
a 0,56 kg.].
Check
with a spring scale hooked on the breaker
arm
at the contact and pull at right
angle
to the
breaker
arm. Make the reading just as the
points
separate. Adjust the point pressure by
loosening
the stud holding the end of the contact arm spring
and
slide the end of the spring in or out as neces
sary.
Retighten the stud and recheck the pressure. Too low a pressure
will
cause
engine
missing at
high
speeds.
Too high a pressure
will
cause rapid wear of the cam, block, and points.
b. Dauntless V-6 Engine (Delco).
The
spark advance is fully automatic being con
trolled by built-in centrifugal weights, and by a vacuum advance system (Fig.
C-13).
The same
checking procedures are used as (a)
above
except,
the capacity of the condenser must be .18 to .23 microfarads and the contact gap should be set at
.016"
[0,406
mm.]. Adjustment of the gap is made
by rotating the socket head adjustment screw with
a
Vs" [3,86 mm.] Allen wrench (Fig.
C-14).
The
contact spring pressure must be 19 to 23 ozs.
[0,538
a
0,652
gr.] and the cam dwell
angle
is
30°,
with distributor vacuum line disconnected.
The
preferred method of adjusting cam dwell re
quires turning of the adjusting screw until the specific dwell
angle
is obtained as measured by a
dwell
angle
meter. Refer to Par. C-l7. To adjust
the cam dwell by an alternate method, turn the adjusting screw in (clockwise) until the
engine
FIG.
C-12—PRESTOLITE DISTRIBUTOR HURRICANE F4 ENGINE
1— Condenser
2—
Lubricating
Wick
3—
Breaker
Cam
4—
Breaker
Arm Pivot 5—
Distributor
Cap (Rotation &
Firing
Order)
6—
Distributor
Points 7— Adjustment
Lock
Screw
8—
Adjusting
Eccentric
Screw
9—
Oiler
10—Primary
Wire
26
Page 27 of 376
'Jeep*
UNIVERSAL
SERIES SERVICE
MANUAL
C
12763
FIG
C-13—
DELCO
DISTRIBUTOR —
DAUNTLESS V-6 ENGINE
1—
Rotor
8—Access Passage
2—
Breaker
Plate Assembly 9—Shaft Bushing
3—
Lubrication
Reservoir 10—Vacuum Assembly
4—
Primary
Terminal
11—Cam
5—
Distributor
Housing 12—Weight Assembly 6—
Shaft
Bushing 13—Cap
7—
Gear
begins
to misfire, then
give
the wrench one-half
turn
in the
opposite
direction (counterclockwise),
thus giving the approximate cam dwell angle re
quirement
Note:
Prestolite and Delco distributors are inter
changeable on V-6
engine
equipped vehicles.
c.
Dauntless V-6 Engine (Prestolite).
•
Refer to Fig. C-l5.
The
Prestolite distributor installed on the V-6
engine
is similar in construction to the distributor
installed on the F4
engine
except for the addition
of a vacuum advance mechanism.
The
spark advance is fully automatic being con-
FIG.
C-14—ADJUSTING CONTACT POINT GAP —
DAUNTLESS V-6 ENGINE (DELCO) trolled by built-in centrifugal weights, and by a
vacuum
advance system.
The
same service checking procedure outlined
in
Par.
C-lOa,
are used for the Prestolite V-6
distributor
with exception of specifications. 12963
FIG.
C-15—-PRESTOLITE DISTRIBUTOR V-6 ENGINE
1—
Vacuum
Advance Unit
5—Lubricating
Wick
2—
Distributor
Points 6—Condenser
3—
Breaker
Arm Pivot 7—Adjusting
Eccentric
Screw
4—
Distributor
Cap 8—Adjusting
Lock
Screw
(Rotation
&
Firing
Order)
Specifications for the V-6 Prestolite distributor are
as follows. The condenser capacity must be .25 to 28 mfd., contact breaker arm tension 17 to 22
ounces [482 a 624 gr.], and breaker point gap .016" [0,406 mm.]. The cam angle must be set
at 29° ±3° with distributor vacuum line discon
nected.
C-11.
Replacement and Adjustment of Prestolite
Distributor Point
Set — V-6
Engine
Replace
the Prestolite distributor contact set as
follows:
a.
Remove the distributor cap from the distributor.
Remove the rotor.
b. The condenser and primary leads are retained
by breaker point spring tension. Refer to Fig.
C-12
and C-15. Relieve spring tension to remove
the leads.
c. Remove the contact set retaining screw and remove the contact set.
d.
Remove the condenser screw and remove the condenser.
e.
Install
new parts by reversing the removal pro
cedure. Relieve spring tension of the breaker point
spring
to install the primary and condenser leads.
f.
Rotate the crankshaft until the distributor cam
holds the distributor points to a wide-open position.
Check
the gap
between
the points. Then slightly
loosen
the contact set mounting screw and adjust
the contact point gap to the proper dimension.
Tighten
the mounting screw when correct gap is attained.
C-12. Breaker
Lever
Spring Tension
One
of the most important items to check is the
breaker
lever spring tension.
This
is checked with
a
spring scale hooked immediately behind the
breaker
lever contact. Spring tension required to
open the contact points are given in Par. C-10. 27
Page 28 of 376
c
TUNE-UP
C-13. Replacement and Adjustment of
Delco
Distributor Point Set
When
inspection of the contact points show re placement to be advisable, the following procedure
should be used. See Fig. C-13.
Note:
The service replacement contact point set
has the breaker spring tension and point alignment
adjusted at the factory.
Removal
of
Contact Point
Set
a.
Remove distributor cap by inserting a screw
driver
in upper slotted end of cap retainers,
press
down and turn 90° counterclockwise. Push distri
butor cap aside and remove rotor. Disconnect the condenser and primary leads from their terminal
by loosening the retaining screw. If there is no
retaining
screw, simply slip leads out.
b. Loosen two screws and lock
washers
which hold
the contact point set in place. Then remove point
set.
Installation
of
Contact Point
Set.
a.
Slide contact point set over
boss
on breaker
plate and under the two screw heads. Tighten two
screws and lock washers.
b.
Install
condenser and primary leads.
Note:
Leads must be properly positioned so they
will
not
come
in contact with
bottom
of weight
base or rotor.
c.
If
engine
does
not start readily, position contact
arm
rubbing block on peak of cam lobe, insert
V%"
[3,86 mm.] Allen wrench in adjusting screw and
turn
screw in (clockwise) until contact points
just
close. Then back screw out (counterclockwise)
V2
turn
(180°)
to obtain a point gap of approxi
mately .016" [0,406 mm.] for a preliminary setting.
Adjustment
of
Contact Points
—
Engine Running
Note:
When adjusting contact point dwell angle,
always follow the instructions which
come
with the
dwell
meter.
a.
Connect dwell tester leads: red to distributor
side of coil, black to ground.
b. Turn
selector switch to position for
6-lobe
cam.
Turn
ignition switch on.
c.
Start engine.
Lift
adjustment window and insert
Vs"
[3,86 mm.] Allen wrench in adjusting screw.
Set dwell angle at 30 degrees. See Fig. C-14.
d.
After adjusting dwell angle, always check
ignition timing.
C-14.
Check
Ignition
Timing
a.
Hurricane F4 Engine.
If
a neon timing light is available, use it to check
igntion timing following the instructions of the
timing light manufacturer.
In
the absence of a timing light, remove No. 1
spark
plug and turn the
engine
over until No. 1
piston is on compression stroke as indicated by
air
being forced from No. 1 spark plug opening.
Turn
the
engine
slowly until the specified
degree
mark
on the timing gear cover is in alignment with
FIG.
C-l6—HURRICANE
F4
ENGINE
TIMING
MARKS
the notch on the crankshaft pulley. Fig. C-l6 shows
the timing pointer arrangement of the Hurricane
F4
engine. Refer to Ignition Timing Specifications
Par.
C-30. When the piston is positioned 5°
BTC,
timing is correctly set if the distributor rotor arm
points to No. 1 terminal in the distributor cap and
the distributor points are just ready to break. See
Fig.
C-12. Timing may be altered by loosening the
distributor
mounting clamp and turning the distri
butor.
Turn
the distributor clockwise to advance
the timing and counterclockwise to retard the tim
ing.
Do not overtighten the mounting clamp screw.
FIG.
C-l7—DISTRIBUTOR ROTATION
AND
FIRING
ORDER,
F4
ENGINE b.
Dauntless V-6 Engine.
Check
timing with a timing light connected to the
spark
plug of No. 1 cylinder (front cylinder, left
bank).
Yellow timing
mark
on the vibration damper must align with the specified
degree
mark
on the timing indicator (Fig.
C-18).
Refer to
Igni
tion Timing Specifications Par. C-30. With the
engine
running at correct idle speed and the vacu
um
advance
hose
disconnected from the distributor
and
the line plugged, check for correct timing
set
ting. If necessary,
loosen
the distributor clamp bolt
and
rotate the distributor until proper alignment of timing marks is attained. Tighten mounting
screw.
After correct setting is made, unplug the
vacuum
line and reconnect it, operate the
engine
and
check operation of the vacuum advance.
Note:
Turn
the distributor counterclockwise to ad
vance timing; turn clockwise to retard timing. 28
Page 32 of 376
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
Page 33 of 376
'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
Page 42 of 376
D
HURRICANE
F4
ENGINE
D-7.
Remove Water Pump
Remove the
bolts
and lockwashers that attach the
water pump to the cylinder block. Remove the water pump.
D-8.
Remove
Exhaust
Manifold
Remove the five nuts from the manifold studs.
Pull
the manifold off the mounting studs. Remove the center and two end gaskets from the cylinder
block. See Section Fl for exhaust emission con trolled engines.
D-9.
Remove Oil
Filler
Tube
Loop
a piece of wire several times around the tube
below the top and make a
loop
through which a
pry
bar may be used to pry over the top of the
engine
water
outlet
fitting.
Pull
on the tube, tapping it just above where it enters the crankcase.
D-10.
Remove Water Outlet Fitting
Remove the nuts and lockwashers that attach the
water
outlet
fitting to the cylinder head.
Lift
the
outlet
fitting from the cylinder head.
D-11.
Remove Thermostat
With
the water
outlet
fitting removed, the thermo
stat can be lifted from the water
outlet
elbow on the cylinder head.
D-12.
Remove
Crankshaft
Pulley
Remove the crankshaft nut.
Install
a puller and
pull
the pulley from the crankshaft.
D-13.
Remove Distributor
a.
Remove
spark
plug cables from the distributor
cap,
noting the order in which they are assembled to ensure correct reassembly. No. 1
spark
plug
terminal
is in the 5 o'clock position. Starting with this tower the cables are installed in a counterclockwise direction in
1-3-4-2
firing order.
b.
Remove the
primary
lead from the terminal
post
at the side of the distributor.
c. Remove the screw holding the distributor to the crankcase and lift the assembly from the engine.
D-14. Remove Oil Pump
The
oil pump is located externally on the left side
of the engine. If only the oil pump is being removed
with
the
engine
in the vehicle, set No. 1 piston at
TDC
for reference for reinstalling the oil pump
without greatly disturbing the ignition timing.
First
remove the distributor cover and
note
the
position of the distributor rotor.
If
the distributor is already removed, sight through
the distributor
hole
before removing the oil pump.
The
slot should be near vertical. Remove the capscrews and lockwashers attaching the oil pump
to the cylinder block.
Carefully
slide the oil pump
and
its drive shaft out of the cylinder block.
D-1S.
Remove
Crankcase
Ventilation Valve
To
remove the crankcase ventilation valve from
the elbow fitting screwed into the inlet manifold of the cylinder head, first remove the
hose
and
clamp from the valve (Fig. D-32), then using a
wrench
carefully unscrew the valve from the
elbow.
D-l6.
Remove Rooker Arm Assemblies
The
rocker arm cover was previously removed as
a
step
of the
engine
removal (Par. D-5).
Remove the nuts from the rocker arm shaft support
studs, and lift the rocker arm assembly off the studs.
Lift
the intake valve push rods out of the
cylinder
block.
D-17.
Remove
Cylinder
Head
a.
Removal.
Disconnect the oil line from the flared tube con
nector and remove the rocker arm attaching stud nuts, and rocker arm shaft assembly if not pre
viously removed. Two end head
bolts
cannot be removed until the rocker arm shaft is removed.
Remove the cylinder head bolts.
There
is one
cylinder
head bolt located below the carburetor
mounting, inside the intake manifold, that must
not be overlooked.
Carefully
lift the cylinder head off the block.
Remove the valve push rods and the valve lifters.
FIG.
D-3—REMOVING
RIDGE
WITH
REAMER
Remove and discard the cylinder head gasket,
b. Disassembly.
Disassemble the parts of the cylinder head as
follows:
With
a spring compressor tool remove the
two-piece
locks recessed in the valve spring re
tainers.
Pull
the
O-ring,
valve spring, and valve out
of the cylinder head. Identify the valves for return to the same
guides
from which they are removed.
42
Page 67 of 376
'Jeep'
UNIVERSAL
SERIES SERVICE
MANUAL
D
Lubricate
the connecting rod bearing surfaces
generously with
engine
oil and install the bearing
cap with the numbered side matched to the num
bered side of the connecting rod. Torque the nuts
evenly 35 to 45 lb-ft. [4,8 a 6,2 kg-m.]. The con
necting rod cap nuts are locked with stamped nuts.
Used
stamped nuts should be discarded and re
placed with new
ones.
These locking stamped nuts
should be installed with the flat face toward the
connecting rod nut.
Turn
the locking nut finger
tight and then 34
turn
more with a wrench. Refer
to Par. D-36 for detailed information on fitting pistons and rings in the cylinder bores.
D-96.
Install
Crankshaft
Pulley
Align
the keyway in the pulley with the woodruff key installed in the crankshaft. Drive the pulley
onto
the crankshaft and secure it in place with
the crankshaft pulley nut. Insert a block of wood
between
one of the counterweights on the
crank
shaft and the side of the cylinder block to prevent the crankshaft from turning, then tighten the nut.
D-97.
Install
Oil Pan
Before installing the oil pan, make a final internal
inspection particularly making certain that the
inside of the cylinder block is clean. Apply a thin
coat of gasket paste on the oil pan. Place the new
oil
pan gasket in position. Set the oil pan in posi
tion on the cylinder block and install the oil pan.
Torque
the attaching
bolts
12 to 15 lb-ft. [1,7 a 2,1
kg-m.].
Install
the oil pan
drain
plug and gasket
and
tighten the plug securely.
D-98.
Install
Cylinder
Head
Make
certain that the entire top of the cylinder
block
assembly, the lower surface of the cylinder
head,
and the cylinder head gasket are clean. Blow
all
dirt
or carbon out of the blind tapped bolt
holes
in
the cylinder block before the cylinder head and gasket are installed. Using aerosol spray sealer
Part
No. 994757, spray a thincoat on both surfaces
of the head gasket, position the new cylinder head gasket with the crimped
edges
of the gasket metal down (See Fig. D-31).
This
gasket position allows a
positive seal along the narrow surfaces of the
cylin
der
head
between
the combustion chambers and
eliminates the possibility of burning combustion
10102
FIG.
D-41—CYLINDER
HEAD
BOLT
TIGHTENING
SEQUENCE
gases
reaching
an
asbestos
portion of the cylinder
head gasket.
Install
the cylinder head bolts. Tighten
the
bolts
with a torque wrench to 60 to 70 lb-ft. 8,3 a 9,7
kg-m.]
in the sequence shown in
Fig.
D-41.
Do not overlook installing the cylinder head bolt
in
the intake
manifold
directly under the
car
buretor
opening.
D-99.
Install
Rocker Arm Assembly
a.
Insert
ball
ends of the intake valve push rods through the cylinder head and cylinder block and
seat them in the cupped head of the intake valve
tappets.
b.
Install
the
rocker-arm
assembly on the 'four
rocker-arm-mounting
studs. Align the rocker arms
so that the
ball
ends of the intake valve tappet
adjusting
screws fit into the cup ends of the push
rods.
c.
Install
the four rocker-arm-attaching nuts.
Thread
each nut down evenly in sequence, one
turn
at a time, until the torque is 30 to 36 lb-ft. [4,1 a 5,0 kg-m.].
d.
Cement a new gasket on the rocker arm cover.
Install
the cover placing an oil seal then a flat
washer
and nut on each cover stud. Cement a new gasket on the exhaust valve cover.
Install
the cover and crankcase ventilation fittings using a
new gasket back of the vent cover and new copper
ring
gaskets under the attaching screw heads.
Torque
the valve tappet cover nuts 7 to 10 lb-ft. [1,0 a 1,4 kg-m.].
D-100.
Install
Distributor and
Spark
Plugs
To
correctly install the distributor, it
will
be neces
sary
to place No. 1 piston in the firing position.
To
locate the firing position of No. 1 piston, first
turn
the
engine
until No. 1 piston is moving up on
the compression stroke as indicated by compression
pressure
being forced through the
spark
plug open
ing.
Turn
the
engine
slowly until the 5° before top
center
mark
on the timing gear cover is in align
ment with the
mark
on the crankshaft pulley. Oil
the distributor housing where it bears on the
cylin
der
block and install the distributor. Mount the
rotor
on distributor shaft and
turn
the shaft until
the rotor points towards No. 1
spark
plug terminal
tower position (when cap is installed, about 5
o'clock) with the contact points just breaking.
Move the rotor back and forth slightly until the
driving
lug on the end of the shaft enters the slot cut in the oil pump gear and slide the distributor
assembly down into place. Rotate the distributor body until the contact points are just breaking.
Install
the hold down screw.
Connect
the core
primary
wire to the distributor.
Clean
and adjust the
spark
plugs, setting the elec
trode
gaps
at .030" [0,762 mm.].
Install
the plugs
to prevent any foreign matter entering the com
bustion chambers during the remaining operations.
Torque
the
spark
plugs 25 to 30 lb-ft. [3,5 a 4,6
kg-m.].
Install
spark
plug cables, placing them in the dis
tributor
cap terminal towers starting with No. 1
and
installing in a counter clockwise direction of
the firing order sequence (1-3-4-2). 67
Page 69 of 376
'Jeep9
UNIVERSAL
SERIES
SERVICE
MANUAL
h.
Check
ignition (distributor) timing; reset if
necessary.
i.
Check
carburetor
adjustments; reset if necessary,
j.
With
engine
fully warmed up, tighten cylinder
head and manifold
bolts
and nuts to specified
torque.
Check
cylinder head gaskets and
bolts
for
air
or coolant leaks.
Note:
Tightness of cylinder head
bolts
should be
checked and corrected after 500 to 600 miles [800
a
960 km.] of normal operation.
k.
Check
fan belt tension; adjust if necessary.
I.
Check
for and correct any oil leak, fuel leak or
coolant leak.
D-107.
VALVE
ADJUSTMENT
Proper
valve adjustment is important to prevent
burning
of valves and poor
engine
performance.
This
adjustment consists of obtaining a specified
lash
in the valve mechanism. The exhaust valve
tappets and the intake valve rocker arms should be adjusted to the proper clearance with the
engine
cold (at room temperature). Valve clearance can
be properly adjusted only when the tappet is on the
heel or low portion of the cam.
INTAKE
OPENS
9°
BTC?
FIG.
D-43-
10270
-VALVE
TIMING
D-108. Valve Adjustment Procedure
The
exhaust valve tappets are adjusted by turning
the adjusting screw in or out of the tappet as neces
sary
to obtain the proper clearance. Where special
wrenches can be obtained, they should be used to facilitate the adjustment. The proper clearance is .016" [0,406 mm.]
between
the end of the adjusting
screw and the
bottom
of the exhaust valve.
Crank
the
engine
over to
close
a valve and check
the clearance with a feeler
gauge.
To adjust, hold
the tappet with one wrench and
turn
the adjusting
screw,
with the other.
Check
and adjust each of
the tappets in proper sequence.
Adjust
each intake valve by adjusting the rocker
arm
screw at the push rod to obtain .018" [0,457 mm.] clearance
between
the rocker arm and the
valve stem with tappet on the heel of the cam.
D-109.
Check
Valve
Timing
To
check the valve timing, carefully set the intake
valve rocker arm adjustment for No. 1 cylinder to .026"
[0,6604
mm.]
between
the rocker arm and the
valve stem. Rotate the crankshaft clockwise until
the piston in No. 1 cylinder is ready for the intake stroke. The intake valve
opens
9° before top center
(BTC).
Note
the distance
between
the
"TC"
and
"5°"
marks on the indicator on the timing gear
cover and estimate the 9° before top center position.
See
Fig.
D-43.
With
the crankshaft in this position, timing is correct if the rocker arm is just tight
against the intake valve stem. Do not overlook resetting the rocker arm adjustment to the correct
running
clearance.
D-110. Positive
Crankcase
Ventilation
Be
sure there are no air leaks at the tube connec
tions
between
the air cleaner and the oil filler tube,
and
that the oil filler tube cap gasket is in
good
condition. Always keep the cap locked securely in
place. When tuning the
engine
or grinding valves, remove the control valve and clean it thoroughly.
If
the valve is blocked with carbon, the ventilating
system
will
not operate and, should the valve
fail
to seat, it
will
be impossible to make the
engine
idle satisfactorily. Refer to Par. C-6 for servicing.
D-111. Oil
Filter
The
engine
is equipped with a throw-away type
oil
filter.
This
oil filter must be serviced periodi
cally
as outlined in the
Lubrication
Section. 69
Page 115 of 376
'Jeep*
UNIVERSAL
SERIES
SERVICE
MANUAL
E
FIG.
E-9—LOW-SPEED
SYSTEM
1—
Body
Flange 6—Idle Air Bleed
2—
-Idle
Adjustment Screw Port
7—Air
By-pass
3—
Idle
Port 8—Economizer
4—
Idle
Well
9—Metering Rod Jet
5—
Low
Speed Jet 10—Idle Adjustment Screw
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 %
turn
to
"Lean
Best
Idle."
Refer
to Fig. E-6.
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 throttle 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
mixture
adjustment back out (counterclockwise
-rich)
until
maximum
speed
is just regained at a "lean as
possible" mixture adjustment.
E-15.
High-Speed System
Fuel
for part-throttle and full-throttle operation
is supplied through the high-speed system shown
in
Fig. E-10. A metering rod and metering rod
jet
control the amount of fuel admitted through the nozzle for high-speed operation. The lower
end of the metering rod is calibrated in size to
accurately
meter the fuel required. As the rod
|
13346
FIG.
E-10—HIGH-SPEED
SYSTEM
1—Nozzle 7—Pump Diaphragm
Spring
2
—Metering
Rod 8—Diaphragm Assembly
3—
Pump
Lifter
Link
9—Chamber
4—
Metering
Rod Arm Assembly
10—Metering
Rod Jet 5—
Diaphragm
Shaft
11—Carburetor
Casting
6—
Upper
Pump Spring 12—Carburetor Bore is automatically raised and lowered in the jet,
the opening in the jet is varied in size to supply
fuel
proportionate to the requirements through the
higher
speed
and power range. The metering rod
is both mechanically and vacuum controlled and is
attached to the metering rod arm assembly.
During
part-throttle operation, vacuum in chamber
pulls
diaphragm down, holding metering arm
assembly against pump lifter
link.
Movement of the metering rod is controlled by the
pump lifter
link
which is attached to the carburetor
throttle shaft. At all
times
vacuum in the chamber
is strong
enough
to overcome the tension of pump
diaphragm
spring. Upper pump spring serves as
a
bumper upon deceleration and as a delayed
action spring upon acceleration. Under any operat ing condition, when the pump diaphragm spring
overcomes vacuum in the chamber, the metering
rod
will
move
toward the wide throttle (power) position.
Note:
Nozzle is pressed in and should not be
removed.
E-16.
Metering Rod Adjustment
Check
metering rod adjustment each time the
carburetor
is reassembled. Before adjustment is
made, be sure that the flat of metering rod arm
is parallel to the flat of pump lifter
link
as shown
(Fig.
E-10.).
With
the throttle valve
seated
in
car
buretor
bore, press down on the upper end of
diaphragm
shaft until the diaphragm
bottoms
in
the vacuum chamber. The metering rod should
now
seat
on casting with the metering rod
arm
flat against the pump lifter
link.
If the meter
ing rod
does
not
seat
on the casting (check by 115