recommended oil JEEP CJ 1953 Service Manual
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Page 10 of 376
B
LUBRICATION
B-2.
Special Lubricants
Special
lubricants are required for certain
lubri
cation points on the 'Jeep' Universal vehicles. The
special
lubricants are necessary for proper function ing and maintenance of the vehicle. The
Lubrica
tion
Chart
(Fig. B-l and B-2)
designates
the spe
cial
lubricating points and identifies them by type
or
part number.
B-3.
Applying
Fresh
Lubricant
When
servicing or lubricating the vehicle, it is important that all old lubricant and
dirt
be re moved from the fitting and/or plugs before servic
ing and that the recommended type of lubricant be used for the particular item being serviced.
Force
lubricant through the lube fittings until the lubricant being forced out of the joint is fresh
lubricant,
indicating that all old lubricant has
been removed.
B-4.
Engine
Lubrication
System —
Hurricane
F4 Engine
•
Refer to Fig. B-3.
The
engine
oil pressure system is designed to pro
vide adequate lubrication to all working parts of
the engine. The gear-type oil pump is driven from
the
engine
camshaft. The pump is provided with a
FIG.
B-3—ENGINE
LUBRICATION
SYSTEM
—
HURRICANE
F4
ENGINE
floating, screened intake that prevents the
circula
tion of any sediment that might accumulate in the
oil
pan. By means of this pump, the main bearing
journals
and crankpins are efficiently lubricated through an oil gallery and passages in the cylinder
block.
Oil
is forced under pressure to the main bear
ings and through the cheeks of the crankshaft to
the connecting rod bearings. Oil is also force-fed
to the camshaft bearings, timing gears, and intake valve rocker arms. The oil pressure is controlled by
relief
valve located in the oil pump. The valve is
designed to open when excessive pressure
develops
in
the system, relieving the pressure and returning the
excess
oil to the oil pan. The cylinder walls,
piston pins, and tappets are supplied with oil from
spurt
holes
in the connecting rods. A portion of the oil is continually passed through an oil filter
which
effectively removes any foreign matter sus pended in the oil. A flanged section on the
rear
of
the crankshaft acts as an oil slinger and, in com
bination with the
rear
main bearing upper and lower oil seal, prevents the leakage of oil from the
rear
end of the cylinder block. Leakage of oil from
the front end of the cylinder block is controlled by the crankshaft oil slinger and the front oil seal
installed in the timing gear cover. The oil pressure
indicator
light in the instrument panel and the oil level
gauge
or dip stick in the side of the
engine
provide a means for checking the oil pressure and
oil
level.
B-5.
Oil Pressure Gauge or Indicator
On
early
CJ-3B
vehicles an oil pressure
gauge
is
mounted on the instrument panel.
This
gauge
in dicates the oil pressure within the
engine
lubri
cating system.
On
Models
CJ-5,
CJ-5A,
CJ-6,
CJ-6A,
DJ-5, DJ-6
and
later production vehicles of Model
CJ-3B
a
red
telltale lamp, which operates when the ignition
switch is turned on, is lit when there is insufficient
oil
pressure to properly lubricate the engine. When
it
goes
out, operating pressure is achieved. In
normal
operation, the light is lit when the ignition
is first turned on. It
goes
out after the vehicle is
in
motion.
Failure
of the
gauge
or indicator to register normal
oil
pressure may indicate insufficient supply of oil
in
the
engine
crankcase, low or no oil pump pres
sure,
or a fault in the
gauge
or indicator electrical
circuit.
The
engine
must be stopped immediately to prevent possible damage to
engine
bearings and
the fault corrected before restarting the engine.
B-6.
Engine
Lubrication
System — Dauntless V-6 Engine
The
engine
lubrication system (Fig. B-4) is the
force
feed
type in which oil is supplied under pres
sure
to the crankshaft, connecting rods, camshaft bearings and valve lifters. Oil is supplied under controlled volume to the rocker arm bearings and push
rods.
All other moving parts are lubricated by gravity flow or splash.
The
supply of oil is
carried
in the oil pan which is filled through a filter opening in the right rocker
arm
cover. A removable oil
gauge
rod on the left side of the crankcase is provided to check oil level.
The
oil pump is located in the timing chain cover 10
Page 11 of 376
'Jeep*
UNIVERSAL
SERIES
SERVICE
MANUAL
13330
FIG.
B-4—ENGINE
LUBRICATION
SYSTEM
—
DAUNTLESS
V-6
ENGINE
1—
Rocker
Arm Shaft
2—
Main
Oil
Line
3—
Oil
Inlet where it is connected by a drilled passage in the
cylinder
crankcase to an oil screen housing and
pipe assembly. The screen is submerged in the oil supply and has ample area for all operating condi
tions. If the screen should
become
clogged
for any reason, oil may be drawn into the system over the
top
edge
of the screen, which is held clear of the
sheet
metal screen housing.
Oil
is drawn into the pump through the screen and
pipe assembly and a drilled passage in the
crank
case, which connects to drilled passages in the
timing chain cover. All oil is discharged from the
pump to the oil pump cover assembly. The cover
assembly consists of an oil pressure relief valve,
an
oil filter bypass valve and a nipple for installa
tion of an oil filter. The spring loaded oil pressure
relief
valve limits the oil pressure to a maximum
of 30 pounds [13.607 kg.] per square inch. The
oil
filter bypass valve
opens
when the filter has
become
clogged
to the
extent
that
4V2
to 5 pounds [2.04 a 2.27 kg.] pressure difference exists
between
the filter inlet and exhaust to bypass the oil filter
and
channel unfiltered oil directly to the main oil galleries of the engine.
A
full flow oil filter is externally mounted to the
oil
filter cover nipple on the right side of the en gine, just below the alternator. Normally, all
engine
oil
passes through the filter element; however, if
the element
becomes
restricted, a spring loaded bypass valve
opens
as mentioned above. The main
oil
galleries run the full length of the crankcase
and
cut into the valve lifter guide
holes
to supply
oil
at full pressure to the lifters. Connecting pas
sages
drilled in the crankcase permit delivery of
oil
at full pressure to all crankshaft and camshaft
bearings.
Holes drilled in the crankshaft
carry
oil from the
crankshaft
bearings to the connecting rod bearings.
Pistons and cylinder walls are lubricated by oil
forced through a small notch in the bearing parting
surface on the connecting rod, which registers with
the
hole
in the crankpin
once
in every revolution. Piston pins are lubricated by splash.
Drilled
holes
in the camshaft connect the front camshaft bearing
journal
to the key slot in the front
of the camshaft. Oil flows from the
journal
into
the keyslot over the woodruff key in the space
between
the key and the camshaft sprocket and fuel pump eccentric.
The
forward end of the fuel pump eccentric in corporates a relief which allows the oil to escape
between
the fuel pump eccentric and the camshaft
distributor
gear. The oil stream strikes the distri
butor shaft gear
once
each camshaft revolution, and provides ample lubrication of the timing chain and
sprockets by splash.
The
rocker arms and valves on each cylinder head
are
supplied with oil from the oil galleries through
holes
drilled in the front of the cylinder block and
cylinder
head. The
hole
drilled in the cylinder
head ends beneath the front rocker
arm
shaft brack et. A notch cast in the base of the rocker arm shaft
bracket
allows the oil to flow up inside the bracket
in
the space
between
the bracket and bolt, to the
hollow rocker arm shaft which is plugged at both
ends.
Each
rocker arm receives oil through a
hole
in
the underside of the shaft. Grooves in the rocker
arm
provide lubrication of the bearing surface. Oil
is metered to the push rod seat and valve stem
through
holes
drilled in the rocker arm. Excess
oil
drains off and returns to the oil pan through
passages in the cylinder head and block. Refer to
the
Lubrication
Chart
for lubrication frequency and
lubrication
type and grade.
B-7.
Chassis
Lubrication
Chassis
and
engine
should be serviced at periodic
intervals.
Most chassis lubricating points, whether
long-life or conventional, have standard lubrication
fittings. Refer to the
Lubrication
Specifications and
Service
Maintenance Schedule for specific points
and
lubricating time intervals. It is not necessary
to disassemble prepacked joints to lubricate them.
Merely
add new lubricant, as described in Par.
B-3,
to remove all old lubricant.
At
the appropriate interval, clean each lubrication
fitting indicated on the Lubrication
Chart
and
Service
Maintenance Schedule. Use a pressure gun
to lubricate. Be sure the grease channels are open
to provide complete lubrication of bearing surfaces.
In
some
cases it may be necessary to disassemble
to clear plugged channels.
When
vehicles are driven primarily in abnormally dusty or wet areas or when a vehicle is subject to
severe operating conditions, perform
these
services
more frequently. Under
these
conditions, no definite interval can be recommended because of the great variety of
uses
and conditions of use. 11
Page 12 of 376
B
LUBRICATION B-3.
SERVICE
MAINTENANCE
SCHEDULE
Perform
the following operations at the mileage shown. Two thousand miles equals
3,200
km.
SERVICE
MAINTENANCE
SCHEDULE
OPERATION
VEHICLE
^ n>
MILEAGE
IN
THOUSANDS
6 8 10 12 24 30
Check Wheel Nut Torque*
Check
Fluid
Level
in Battery X Check
Fluid
Level
in Brake Master Cylinder0. X
Service
Cooling
System X Service Tires X
Lubricate
Distributor
Cam Lubricator (F4-134) X
Lubricate
Steering Linkage X
Lubricate
Propeller Shaft Universal Joints X
Lubricate
Propeller Shaft
Slip
Joints ; X
Lubricate
Tie Rod and Drag
Link
Sockets................................... X Change Engine
Oil
and
Filter,
and Service Air Cleaner (F4 134 Engine)** X
Change Engine Oil and
Filter,
and Service Air Cleaner (V6-225 Engine)**....
Check Brake Operation and Pedal
Free
Play X Check
Clutch
Pedal
Free
Play. .... X
Check all
V-Belt
Tensions X
Check Exhaust Emission System
(If
so equipped)*** \ X
Service Positive
Crankcase
Vent
Valve
and Breather . .' X
Road Test
Including
a Check of all Instrument
Lights
and Controls X Tune-up Engine
Check Operation of
Manifold
Heat
Control
Valve
Clean
Exterior of Radiator
Align
Headlights • Check Brake
Linings
,
Check Exhaust System for Leaks Replace Canister Air
Filter
(F. E. E. C. System)
Check
Axle
U-Bolt
Torque. Check Lubricaunt
Level
of Front
Axle
Universal Joints
Check Shock Absorber Mountings and Bushings Check Front and
Rear
Spring Bushings
Lubricate
Distributor
(V6-225).
Replace Spark, Plugs
Check Charging and Starting Circuits
Lubricate
Tailgate Latch, Supports and Hinges.
Lubricate
Door and
Hood
Hinge Pivots ;
Lubricate
Glove Compartment Door Latch
Lubricate
Heater Controls •
Lubricate
Windshield
Wiper and Washer Controls
Clean,
Repack and
Adjust
Wheel Bearings
Change Transmission and Transfer Lubricant. .
Replace
Dry-Type
Air Cleaner • Check Lubricant
Level
of
Differential
Lubricate
Transfer
Case
Shift
LeArer
Control
C«se.
. , . . . . . . . .
Continuing
each
2,000 miles
Continuing
each
6,000 miles
Continuing
each
24,000 miles
X
Continuing
each
30,000 miles
•Check after the
first
200 miles [320
km.
J
of operation.
If
wheel or wheels are changed for any
reason,
have
wheel nut torque rechecked after an additional two hundred miles of operation
••Service mileage shown or every 60 days, whichever occurs
first.
•••Maintenance check on emission system must be performed per
information
in this manual. "See text for brakes.
"Nj
^Miles
2,000
6,000
12,000
18,000
24,000
30,000
Kilometers
3,200
9,600
19,200
28,800
38,400 48,000
B-9.
Engine Oil
For
maximum
engine
protection under all driving conditions encountered during the recommended
oil
change intervals, it is necessary to use only
"MS"
certified
sequence-tested
oils. The term
"MS"
must appear on the oil container singly or
in
conjunction with other designations. "MS" des
ignated oils are heavy-duty detergent oils that are
formulated to withstand all service conditions in
modern powerplants. Engine oils designated only
as
"ML"
and/or
"MM"
are not recommended and should not be used except in an emergency when
"MS"
oil is not available. Certified
sequence-tested
engine
oils are described on their containers by
such
phrases as:
meets,
exceeds,
excels, or has
proven superior in the
test
requirements,
test
sequences, MS Service
tests,
standards, and service
requirements,
of automotive manufacturers, auto
makers,
or car manufacturers for MS service or
Service
MS.
It
may be necessary to change
engine
oil more
frequently than normally recommended, depending upon the type and quality of oil used, the severity
of operation conditions, if the
engine
is used for
short
periods in cold weather, or if the
engine
is allowed to idle for excessive periods.
Always
drain
the crankcase while the
engine
is hot since
dirt
and contaminants are then more
likely
to be held in suspension and therefore
will
drain
out more completely.
Drain
the crankcase as follows:
a.
Position the
drain
receptacle under the
drain
plug.
b.
Remove the
drain
plug using the correct size
wrench.
Be careful of hot oil.
c.
Carefully
clean the
drain
plug. Inspect and
replace
the gasket, if deteriorated.
d.
When the oil has drained, replace and tighten
the crankcase
drain
plug. 12
Page 16 of 376
B
LUBRICATION
Note:
Hard
shifting of the transmission gear in
cold weather is a positive indication that the
lubri
cant
is of the wrong viscosity or of poor quality
which
allows it to congeal.
B-38.
Optional
4-Speed
Transmission
and
Transfer Case
The
four-speed transmission and transfer case re
quire
separate lubrication for each unit as
they
have no cross-over oil passage. At each transmission
service check, the
fill
plugs of
both
four-speed
transmission
and transfer case should be pulled
and
the lubricant refilled to level if necessary.
B-39.
Transfer
Case
Linkage
The
transfer case shift linkage should be lubricated
periodically.
All
bearing surfaces that are assembled
with
studs and cotter pins should be disassembled, cleaned, and coated with a
good
waterproof grease.
The
bearing surfaces that cannot be disassembled
should be lubricated with a lubricant that
will
penetrate the bearing
area.
These bearings include
the two on the cross shaft assembly and the
threaded stud.
The
type
of penetrating lubricant recommended is
DuPont
"PM 7", No. 2911, or its equivalent.
B-40.
Brake Master Cylinder
Clean
the top of the
fill
cap and also the housing
area
around it. Remove the cap and observe the
fluid
level. It should be
half
an inch
below
the top
of the fill-hole. If not, add brake fluid to
half
inch
[1,3 cm.]
below
the top of the fill-hole. Use
only heavy-duty brake fluid conforming to speci
fication
SAE-J-1703.
Be sure to handle the brake
fluid
in clean dispensers and containers that
will
not introduce even the
slightest
amount of other
liquids
or foreign particles. Replace and tighten
the
fill
cap.
B-41.
Adjust Brakes
Refer
to Section P.
B-42.
Brake Linings
Refer
to Section P.
B-43.
Adjust Clutch
Refer
to Section I.
B-44.
Clutch Cross Shaft (Lever Type)
Lubricate
the clutch cross shaft in accordance with
specifications given in the
Lubrication
chart: see
Item
1. Chassis Bearings.
B-45.
Tie Rod and Drag
Link
Sockets
The
tie rod and drag
link
sockets
are equipped
with
lubrication
fittings
and should be lubricated
per
specifications given in the
Lubrication
chart: see Item 1. Chassis Bearings.
B-46.
Front
and
Rear Spring
Bushings
The
condition of the spring bushings is indicated
by the alignment of the spring pivot and spring
shackle
bolts.
Check
the alignment of
these
bolts,
and
check that nuts are
tightened
securely.
B-47.
Spring
Shackles
Rubber
bushings are provided on the spring
shackles.
These rubber bushings have no lubrication
fitting and it is very important that
they
never be lubricated.
B-48.
Shock Absorbers
Visually
check for broken mounts or bolts, worn
or
missing bushings on the shock absorbers. Refer
to Section S.
B-49.
Front and
Rear
Axle
U-Bolts
Torque
the front and
rear
axle U-bolts. Refer to Section S.
B-50. Front
and
Rear
Axle
Differentials
—
Lubricant Levels
The
lubricant
level of all front and
rear
differentials should be at the level of the fill-hole.
B-51.
Front and
Rear
Axle
Differentials
—
Changing
Lubricant
B-52.
Conventional Differentials
To
remove the lubricant from the front or
rear
differential,
it is necessary to remove the housing cover. Let the lubricant
drain
out, and then flush
the differential with a flushing oil or light
engine
oil
to clean out the housing
(except
Powr-Lok
or
Trac-Lok
Differentials). Do not use water, steam,
kerosene, or
gasoline
for flushing.
Reinstall
the housing cover, replacing the gasket whenever necessary, torquing the cover
bolts
to 15 to 25 lb-ft. [2,1 a 3,4 kg-m.].
Remove the filler plug, and
refill
the differential
housing as specified in the
Lubrication
Specifica
tions.
B-53.
Powr-Lok
or
Trac-Lok Differential
Some vehicles may be equipped with the
Powr-Lok
or
Trac-Lok
Differential as optional equipment.
Special
lubricant and ordinary multipurpose gear
lubricants
must
not be used. Use only
'Jeep*
Differ
ential
Oil,
Part
No. 94557.
Powr-Lok
or
Trac-Lok
differentials may be cleaned
only by disassembling the unit and wiping with
clean
rags. Do not flush the unit. Refer to Sec
tion N.
B-54.
Front Axle Universal Joint
—
Lube
Check
the level of the front axle universal joint
lubricant
at each front wheel by removing the
fill-hole plug. The lubricant should be level with
the fill-hole. If required, add lubricant as specified
in
Lubrication
Specifications.
B-55.
Front
Axle
Universal
Joint
— Service
On
all 4-wheel drive vehicles the front axle
uni
versal
joint should be serviced by removing the shaft and thoroughly cleaning the universal joints
and
housing. For the correct procedures, refer to
Section M. 16
Page 45 of 376
'Jeep'
UNIVERSAL SERIES SERVICE
MANUAL
D
Remove the screws and lockwashers that attach
the main bearing caps to the cylinder block. Use
a
lifting bar beneath the ends of each bearing cap.
Be
careful not to exert too much pressure to cause
damage to the cap or
dowels
and pry the caps free.
CAUTION:
If main bearing caps are not removed
carefully
by raising both sides of each cap evenly
until
free of the dowels, the
dowels
may be bent.
A
bent main bearing cap dowel can cause misalign ment of the cap and resultant
rapid
bearing wear
necessitating replacement. Therefore, remove each
main
bearing cap carefully. If there is reason to
believe any of the
dowels
have been bent during
the bearing cap removal, remove them and install
new
dowels
as detailed in Par. D-34c.
Remove the upper
half
of the
rear
main bearing
oil
seal from the cylinder block and the lower
half
from
the oil seal
groove
in the
rear
main bearing
cap.
Install
the main bearing caps and bearings on
the cylinder block in their original positions.
Note;
Removal of the crankshaft may be ac
complished only with the
engine
out of the vehicle.
D-27.
Remove
Exhaust
Valves and Springs
Access to the valve chamber is obtained by re moving the attaching parts and the valve spring
cover and gasket from the cylinder block. Use cloths
to block off the three
holes
in the exhaust valve
chamber to prevent the valve retaining locks falling
into the crankcase, should they be accidentally dropped.
With
a valve
/
spring compressor, compress the valve springs on
those
valves which are in the
closed position (valve seated against cylinder
block).
Remove the exhaust valve spring retainer
locks,
the exhaust valve spring retainer, and the exhaust valve spring. Close the other valves by
rotating the camshaft and repeat the above opera
tion for the other valves in the same manner.
Lift
out all the exhaust valves and tag or place them in
a
rack
to indicate the location where each was removed from the cylinder block. If a valve sticks in
the guide and cannot be easily lifted out,
pull
the valve upward as far as possible and remove the
spring.
Lower
the valve and remove any carbon
deposits
from the valve stem.
This
will
permit re moval of the valve.
For
intake valve and spring removal, see
Par.
D-l7.
D-28.
Remove Camshaft
a.
Push the intake and exhaust valve tappets into the cylinder block as far as possible so the ends of
the tappets are not in contact with the camshaft. b. Secure each tappet in the raised position by in
stalling a common clip-type clothes pin on the
shank
of each tappet or tie them up in the valve
chamber.
c. Remove the camshaft thrust plate attaching
screws.
Remove the camshaft thrust plate and
spacer.
d.
Pull
the camshaft forward out of the cylinder
block using care to prevent damage to the cam
shaft bearing surfaces.
D-29.
Remove Valve Tappets
Remove the intake and exhaust valve tappets from
the
bottom
or crankshaft side of the cylinder block
after the camshaft has been removed. Tag each
tappet or place them in a marked
rack
so they may be reassembled in their original positions.
D-30.
Remove Oil
Gallery
Plugs
Remove the plug at each end of the oil gallery in the cylinder block.
This
operation is only applicable
when the
engine
is out of the vehicle and
will
allow access to the oil gallery so it may be cleaned.
D-31. ENGINE INSPECTION
AND
REPAIR
The
inspection and repair procedures detailed here
in
are recommended to be followed when a com
plete
engine
overhaul is to be made with the
engine
out of the vehicle. These instructions can generally be applied individually with the
engine
in the
vehicle. Wherever the procedure differs due to
the
engine
being in the vehicle, the necessary
special
instructions are provided. Inspection and
repair
instructions are included to cover the
cylinder
block, cylinder head, crankshaft and bearings, connecting rods and bearings, oil pump, valves and tappets, pistons and rings, flywheel,
timing gears, and the camshaft and bearings. In addition, fitting operations for
these
engine
com
ponents
are included.
Important:
Before the inspection and repair pro
cedures listed below are begun, the
engine
serial
number must be checked for the presence of
code
letters denoting undersize bearings or oversize
pistons. Refer to Par. D-2.
D-32.
Cylinder
Block
The
cylinder block must be thoroughly cleaned, inspected and repaired as detailed in the following
paragraphs.
D-33.
Cleaning
The
cylinder block may be steam cleaned or cleaned
with
a suitable solvent. A scraper is recommended
to remove
hard
deposits, except on highly finished surfaces. Special attention must be directed to the
cleaning of the oil passages, valve chamber,
crank
case, and cylinder walls to remove all sludge,
dirt
and
carbon deposits. After cleaning, use air pressure to dry the block thoroughly.
D-34. Inspection
Examine
the cylinder block for minute cracks and
fractures.
Rusted valve springs or evidence of rust
in
the valve chamber or the cylinder walls is a
good
indication of a possible
crack
in the block,
a.
Examine all machined surfaces of the cylinder block for
burrs
and scores.
Check
for cylinder block
distortion by placing a straight
edge
along the
length of the cylinder head surface of the block.
With
a feeler
gauge,
check for clearance
between
the straight
edge
and the block, particularly be
tween adjacent cylinders. Maximum permissible
out of line for service is .010"
[0,254
mm.] over the
full
length of the block. 45
Page 47 of 376
'Jeep*
UNIVERSAL
SERIES SERVICE
MANUAL
D
straight
in the hole, then tap the dowel lightly
with
a hammer until it
bottoms.
d.
When installing bearing eaps, be sure to tighten
the
bolts
evenly in each cap to
pull
it into place
without bending the
dowels
or distorting the
bearing
cap.
e. Other parts of the block which require inspec tion
and
possible
repair,
but which are directly
related
to other
engine
components (such as tappets, pistons, camshaft, valves, crankshaft, and
oil
pump) are covered later in this section.
D-35.
Cylinder
Bores
The
cylinder bores may be reconditioned by honing
or
reboring. Use oil-soaked rags to protect
crank
shaft
journals
and other
engine
parts from abrasive
dust during all reconditioning operations.
Both
honing and reboring of the cylinders must be
done
carefully to fit the pistons and to obtain
specified clearances. If reboring of the cylinder bores is not required but the walls are glazed, use
a
finishing
hone
to remove the glaze. Reboring the cylinders must not be attempted unless ade
quate facilities and experienced service technicians
are
available. The amount of material to be removed is determined from the original diameter
of the cylinder bores (3.125" to 3.127") [79,375 a
79,426
mm.] plus the amount of oversize in diameter
of the oversize pistons to be fitted. Pistons are
available
in the following oversizes.
.010"
[0,254
mm.] .030" [0,762 mm.] .020" [0,508 mm.] .040" [1,016 mm.}
The
largest cylinder bore
will
determine the over
size to which all cylinders must be rebored, since the size and weight of all pistons must be uniform
to maintain proper
engine
balance. The maximum rebore should not exceed .040" [1,016 mm.] from
standard.
Measure
the cylinder diameters by making mea
surements both parallel to and at right angles to
crankshaft
over entire piston travel and at
bottom
of cylinder. Proceed as follows:
a.
If bores are scored; if out-of-round
exceeds
.005
"
[0,127 mm.]; if diameters differ more than .005";
or
if taper
exceeds
.005
"
on diameter, it is generally
recommended that cylinders be reconditioned by
reboring
and honing to the next oversize using new
pistons of the proper size.
Note:
If reboring is performed, allow .0015"
[0,0381
mm.] for final honing.
All
cylinder bore diameters must be within .002
"
[0,0508
mm.] after reconditioning.
b.
If bore measurements are within the above
limits,
but indicate hollows or waviness, cylinders should be honed with 250 grit
stone
hone. Pump
hone
up and down in cylinder while it is rotating
to produce a satin-finish, diamond cross-hatched
pattern
approximately 30° with horizontal. Hone
only enough to correct waviness.
c. If cylinder bore correction is unnecessary, break the glaze on cylinder walls with a 250 grit
stone
hone
or with a suitable deglazing tool. Operate the
hone
or deglazer to obtain diamond cross-hatched
pattern
previously mentioned.
d.
Regardless of type of correction on cylinder
walls,
wash out bores thoroughly afterwards and
apply
a light coat of
engine
oil. If cylinders have
been rebored or honed heavily, measure cylinder
diameters again to assure proper selection of piston
size.
D-36.
Pistons, Rings, and Connecting Rods
Pistons are each fitted with three rings, two com pression rings and one oil control
ring.
The pistons have an extra
groove
above the top ring which acts as a heat dam or insulating
groove
to protect
against sealing of the top ring in the ring
groove
with
hard
carbon. The piston pin is secured by the lock screw.
The
pistons and connecting rods were removed from
the
engine
as assemblies. If cylinders were rebored,
new oversized pistons and rings
will
have to be in
stalled.
Disassemble the pistons and rods. Remove the
two compression rings, the oil control
ring,
and the oil control ring expander from each piston. Do not remove the
bolts
from the lower end of the
connecting rods unless the
bolts
are damaged.
Clamp
each connecting rod and piston assembly
in
a padded bench vise and remove the piston pin
lock
screw and lockwasher. Press the piston pin
out of the piston and connecting rod.
Clean
all
carbon,
gum, and lacquer
deposits
from both the
inner
and outer surfaces of each piston, connecting
rod,
and piston pin. Use a ring
groove
cleaner or a
broken
ring filed to a sharp square
edge
to clean
the carbon from the piston ring
grooves
and the
insulator
groove. Use care not to scrape metal from
the sides of the
grooves
or make
burrs
on ring
groove
surfaces. Run a length of wire through the
oil
spray
hole
near the lower end of the connecting
rod
to clear the
hole
of hardened oil
deposits
or
foreign matter.
Carefully
inspect the pistons and
replace
any that are broken or cracked. Replace
pistons if any of the ring lands are chipped, broken,
or
rounded on the
edges;
or if the piston is scored,
scratched,
or burned so seriously that the imperfec
tions cannot be removed with a hand honing
stone
or
crocus cloth.
Replace
the pistons as follows:
a.
After cylinder bores have been carefully checked for out-of-round and taper (Par. D-35), check fit
of each piston to cylinder bore with block and
pistons clean and dry and at approximately 70
°F.
[21°C]
by using Piston Fitting Gauge And Scale
Tool
No. C-690 as shown in Fig. D-7. Use a .003"
[0,0762
mm.] thickness
gauge
%" [19 mm.] wide.
The
piston is fitted upside down in the block to
facilitate the operation. The
gauge
must extend the
full
length of the piston on the thrust side
(opposite
side from slot in piston
skirt).
Scale should register
5
to 10 pounds [2,3 a 4,5 kg.]
pull
to remove the
thickness
gauge
from
between
cylinder
wall
and piston. Excessive
pull
indicates need for a slightly
smaller
piston or additional honing of cylinder. In sufficient
pull
indicates need for fitting a larger piston. 47
Page 48 of 376
D
HURRICANE
F4
ENGINE
FIG.
D-7—PISTON
FITTING
b.
Check
and if necessary correct connecting rod
alignment using a connecting rod aligning fixture,
such
as the one shown in Fig. D-8, in accordance
with
the instructions furnished with the fixture.
c.
Check
the piston pin fit. The piston pins are fitted
with
a clearance of .0001" to .0003" [0,0025
a
0,0076
mm.] which approximates a light thumb
push
fit at room temperature. See Fig. D-9. The piston pins are anchored in the rods with lock
screws.
Installation of oversize pins in this
engine
is not recommended as experience has shown that
should a pin be worn sufficiently to require replace ment, the piston should also be replaced.
Clamp
the connecting rod in a vise using
jaw
shields
of
soft
metal or two pieces of hardwood, one on
each side of the rod and positioned approximately
3" [76 mm.] from the piston pin end.
Start
,
.. . | 10278 j
FIG.
D-8—CHECKING
CONNECTING
ROD
ALIGNMENT
1
—Feeler
Gauge
2—Fixture
FIG.
D-9—PISTON PIN
FITTING
the piston pin in the piston with the lock
screw
groove
facing down. Assemble piston to connecting rod with the piston
skirt
T-slot on
FIG.
D-10—CONNECTING ROD AND
PISTON
1—
Oil
Spray
Hole
2—
Piston
Skirt
T-slot
3—
Relative
Position
of
Camshaft
48
Page 51 of 376
-Jeep*
UNIVERSAL
SERIES SERVICE
MANUAL
E>
[5,928 a
5,926
cm.] for all main bearings. Allowable
taper or out-of-round of the journals is .001"
[0,0254
mm.].
D-42.
Checking Connecting Rod
Crankpins
Check
the crankpin diameters with a micrometer
to ensure that they are not out-of-round or tapered more than .001"
[0,0254
mm.] The standard
crank-
pin
diameter is
1.9383*
to
1.9375"
[4,9233
a
4,9213
cm.].
D-43.
Crankshaft
Main
Bearings
The
crankshaft rotates on three main bearings
with
a running clearance of .0003" to .0029"
[0,0076
a
0,0736
mm.].
These
bearings are positioned and prevented from
rotating in their supports in the cylinder block by
dowel pins. Dowel pins are used in both the center
and
the
rear
bearing caps. No dowel pins are used
in
the front bearing cap because the bearing has
a
flange. The front main bearing takes the end
thrust
of the crankshaft. The main bearings are of premium type which provides long bearing life.
They
are replaceable and when correctly installed, provide proper clearance without filing, boring,
scraping,
or shimming. Crankshaft bearings can
be removed from this
engine
only with the
engine
out of the vehicle. Crankshaft bearings must be replaced as a complete set of three bearings, each
bearing consisting of two halves.
Main
bearings
are
available in the standard size and the following
undersizes:
.001" [0,025mm.] .012" [0,305 mm.] .002" [0,051mm.] .020" [0,508 mm.] .010" [0,254mm.] .030" [0,762 mm.]
The
.001" and .002" undersize main bearings are
for use with standard size crankshafts having
slightly worn
journals.
The .010", .020", and .030" undersize bearings are for use with undersize
crankshafts
in
those
sizes. The .012" undersize
bearings are for use with .010" undersize
crank
shafts having slightly worn journals. Bearing sizes
are
rubber stamped on the reverse side of each
bearing half.
D-44. Crankshaft
Main
Bearing Inspection
The
crankshaft
journals
must be carefully inspected
as detailed previously in Par. D-41. Worn journals
will
require undersize bearings. Scored, flaked, or
worn
bearings must be replaced. Measure the main
bearing bores in the cylinder block using a
telescope
gauge
and micrometer. Measure the bores at right
angles to the split line and at 45° to the split line.
The
bores should not be over .001"
[0,0254
mm.]
out-of-round or .001" in taper from end to end.
Also,
the bores should not be more then .001"
oversize, considering the average diameter of the
bore.
D-45.
Fitting Crankshaft
Main
Bearings
Using
Plastigage
After
wiping and carefully inspecting the bearing bore, install the proper bearing. See that the oil
hole
in the bearing upper half registers properly
with
the oil
hole
in the block, and that the bearing
lock fits properly in the notch in the block.
Install
the crankshaft if replacing bearings with the
engine
out of the vehicle. The desired running fit (dif
ference
between
the diameter of the crankshaft
journal
and the inside diameter of the fitted bear ing) for a main bearing is .0003" to .0029"
[0,0076
a
0,0736
mm.]. With a dimension in
excess
of this
standard
running fit, a satisfactory bearing replacement cannot be made and it
will
be necessary to
regrind
the crankshaft.
Install
the bearing lower
half
and the bearing cap and draw the nuts down
equally and only slightly tight. Rotate the
crank
shaft by hand to be sure it turns freely without
drag.
Pull
the nuts tighter, first one then the other,
a
little at a time, intermittently rotating the
crank
shaft by hand until the recommended torque of
35 to 45 lb-ft. [4,8 a 6,2 kg-m.] is reached. If the
bearings are of the correct size, and lubricated with
light oil before installation, the crankshaft should
turn
freely in the bearings. If the crankshaft cannot
be turned, a larger bearing is
required.
If there is no binding or tightness, it is still necessary to check
clearance to guard against too
loose
a fit. Never file
either the bearing cap or the bearing to compensate
for too much clearance. Do not use shims under a
bearing cap or behind a bearing shell. Do not run a
new bearing half with a worn bearing half. The use
of "Plastigage" of the proper size to measure .001" [0,025 mm.] clearance is recommended for check
ing crankshaft main bearing clearance. The method
of checking clearance is as follows:
a.
Remove the bearing cap and carefully wipe
all
oil from the bearing and the
journal.
b.
Lay a piece of "Plastigage" y%" [3 mm.]
shorter than the width of the bearing across the
journal
(lengthwise of the crankshaft).
c.
Install
the bearing and cap and tighten first
one nut, then the other, a little at a time to the specified torque. As the bearing
tightens
down
around
the
journal,
the "Plastigage" flattens to a
width that indicates the bearing clearance.
d.
Remove the cap and measure the width of
the flattened "Plastigage," using the scale printed
on the
edge
of the envelope. The proper size "Plasti
gage"
will
accurately measure clearance down to .001".
e. If the flattened "Plastigage" tapers toward the middle, or toward the end, or both ends, there
is a difference in clearance, indicating a taper, a
low
spot,
or other irregularity of the bearing or
journal.
D-46.
Fitting Crankshaft
Main
Bearings
Using
Shim Stock
Thin
feeler or shim stock may be used instead of "Plastigage" to check bearing clearances. The
method is simple, but care must be taken to protect
the bearing metal surface from
injury
by too much pressure against the feeler stock,
a.
Cut a piece of .001" [0,025 mm.] thick, by Yl [12,7 mm.] wide, feeler stock }4" [3 mm.]
shorter than the width of the bearing. Coat this 51
Page 52 of 376
D
HURRICANE
F4
ENGINE
10442
FIG.
D-l6—SHIM
STOCK
IN
POSITION
ON
MAIN
BEARING
1—0.001"
Feeler Stock H' Wide feeler stock with light
engine
oil and lay it on the
bearing
in the cap, as shown in
Fig.
D-16.
With
the
shim
in this position, install the bearing and cap
on the crankshaft.
b.
Tighten the bearing cap nuts, first one and
then the other, a little at a time to 35 to 45 lb-ft. torque [4,8 a 6,2 kg-m.].
c.
Turn
the crankshaft by hand not more than
one inch in either direction.
Caution:
Turning
the crankshaft more may imbed the shim stock in the bearing, giving a false indica
tion of fit and damaging the bearing.
If
the bearing clearance is correct, the piece of .001"
feeler stock should produce a light to heavy drag.
If
there is little or no drag the bearing fit is too
loose.
If the crankshaft
will
not
turn
there is not
enough clearance. In either case another bearing must be selected to provide the proper fit.
d.
After the bearing has been correctly fitted, remove the shim stock, wipe the bearing and
journal
carefully and apply clean
engine
oil to the
surfaces.
Replace the cap and tighten the nuts first one, then the other, a little at a time, to the
prescribed
torque. The crankshaft should now
turn
freely without drag.
FIG.
D-l
7—CONNECTING
ROD
OFFSET
D-47.
Connecting Rod Bearings
The
connecting rod bearings, like the crankshaft
main
bearings, are of the replaceable type. When
correctly
installed, the bearings provide proper
clearance
without filing, boring, scraping, or
shimming.
Main
bearings with maximum wearing surfaces
are
obtained through the use of
offset
connecting
rods.
When the rods are installed, the
offset
"A"
in
Fig. D-l7 is placed away from the nearest main
bearing
"B".
The
oil spray
hole
should be on the "follow" side
or
away from the camshaft, toward the right side
of the vehicle. Because of the
offset
and oil spray
hole, No. 1 and 2 or No. 3 and 4 connecting rods cannot be interchanged for if they are reversed,
the oil spray
hole
will
be on the wrong side. No. 1
and
3 or No. 2 and 4 can be interchanged.
Connecting
rod bearings should be replaced as a complete set.
Each
bearing consists of two halves.
Connecting
rod bearing
sets
are available in stand
ard
size and the following undersize:
.001" [0,025 mm.] .012" [0,305 mm.]
.002"
[0,051
mm.] .020" [0,508 mm.] .010"
[0,254
mm.] .030" [0,762 mm.]
The
.001" and .002" undersize bearings are for use
with
standard size crankshafts having slightly
worn
crankpins that do not require grinding. The .012" undersize bearings are for use with slightly
worn
crankshafts that have been previously ground for .010" undersize bearings.
Should
it be necessary to replace the bearings due to wear, replacement of piston rings and piston
pins is also recommended.
NOTE:
Should it be necessary to replace a scored
or
burned No. 1 connecting rod bearing, see Par. D-92 regarding timing gear oil jet.
D-48.
Connecting Rod Bearing Inspection
The
bearing fits may be roughly checked by shaking the connecting rod by hand,
prior
to removal of
the bearing cap, to determine if it is
loose
on the
crankshaft.
The crankpins must be carefully in
spected as detailed previously in Par. D-41.
Worn
crankpins
will
require undersize bearings. Scored,
flaked,
or
worn bearings must be replaced.
D-49.
Installing Connecting Rod Bearings
New bearings must be installed so that the oil
spray
hole
in the upper bearing
half
aligns with
the oil spray
hole
in the connecting rod.
Each
bearing
cap must be installed to seat evenly on the connecting rod from which it was removed, and in
the same position. After wiping and carefully in specting the bearing bore in the connecting rod,
install
the proper bearing. Never file either the
bearing
cap or the bearing to compensate for too
much
clearance. Do not use shims under a bearing
cap or behind a bearing shell. Do not run a new
bearing
half
with a worn half.
The
desired running fit (difference
between
the diameter of the
crankpin
and the inside diameter
of the fitted bearing) for a connecting rod bearing
is .0003" to .0025"
[0,0076
a
0,0635
mm.].
With
a dimension in
excess
of this standard running fit, a 52
Page 53 of 376
'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL
D
satisfactory bearing replacement cannot be made
and
it
will
be necessary to regrind the crankshaft.
Install
the bearing lower
half
and the connecting
rod
cap and draw the cap bolt nuts down equally
and
only slightly tight. Move the connecting rod
endwise, one way or the other, on the crankshaft to be sure the bearing is not tight.
Pull
the nuts tighter, first one then the other, a little at a time,
and
keep trying the fit of the rod on the crankshaft by hand until the recommended torque of 35 to 45 lb-ft. [4,8 a 6,2 kg-m.] is reached. If the
bearings are of the correct size, and have been
properly
lubricated with light
engine
oil before in
stallation,
the connecting rod should be easy to
slide back and forth parallel to the
crankpin.
If
the connecting rod is tight on the crankshaft, a
larger
bearing is required. If there is no binding
or
tightness, it is
still
necessary to check clearance
to guard against too
loose
a fit. The use of "Plasti
gage"
or shim stock of the proper size to measure .001" [0,025 mm.] clearance is recommended for
checking
connecting rod bearing clearances.
This
is the same material recommended for checking
crankshaft
main bearings and the method of check
ing is
similar.
Refer to
Par.
D-45 or D-46. Connect
ing rod bearings are fitted to the same clearance as the main bearings but the torque specified for con
necting rod cap
bolts
is different.
D-50.
Connecting
Rod
Side Play
Check
the connecting rod side play with a feeler
gauge
as shown in Fig. D-l8. The side clearance is .004" to .010"
[0,101
a
0,254
mm.].
D-51.
Camshaft and Bearings
The
camshaft is supported at four points in the
cylinder
block. The front is supported in a re placeable, steel-shell, babbit-lined bearing. The
bearing
is pressed into place The other three bear-
FIG.
D-18—CONNECTING
ROD
SIDE
PLAY
ing surfaces are precision machined in the cylinder
block. The camshaft bearings are pressure
lubri
cated through drilled passages in the crankcase.
End
thrust of the camshaft is taken by a thrust plate bolted to the crankcase. The camshaft is
driven
by a silent helical-cut
tooth
timing gear at
the front of the engine. A worm gear, integral with
the camshaft, drives the oil pump and distributor.
The
fuel pump is actuated by an eccentric forged
onto
the camshaft.
Clean
the camshaft thoroughly in cleaning solvent.
Inspect
all camshaft bearing surfaces to determine
if
they are scored or rough. The cam faces must be
perfectly smooth throughout their contact face
and
must not be scored or worn.
D-52.
Camshaft
Front Bearing Replacement
Use
a suitable driver to remove the camshaft front
bearing
from the cylinder block. To install a new
bearing,
align the oil
hole
in the bearing with the
bored oil
hole
in the cylinder block and drive the
bearing
in until the front end of the bearing is
flush
with the front surface of the cylinder block.
Make
sure the oil
hole
is open and clear. It is not
necessary to line-ream the bearing after installation because bearings for replacement are precision
reamed
to the finished size. Do not stake the
bearing.
D-53-
Camshaft End Play
End
play of the camshaft is determined by running
clearance
between
the
rear
face of the camshaft gear and the thrust plate and is established by the
spacer
thickness. The standard clearance is .004"
to .007"
[0,101
a 0,178 mm.] and can be measured by a
dial
indicator. As a general rule this clearance
will
change but little through wear or when a new gear is installed. To predetermine the correct end
float with the gear, spacer, and thrust plate re
moved, measure the thickness of both the thrust
plate and spacer with a micrometer. The thickness
of the spacer should be approximately .006" [0,152 mm.] greater than that of the thrust plate.
When
this is correct and the parts are assembled
and
drawn tightly
together
by the gear retaining
screw,
the end play should
come
within standard
limits.
D-54.
Timing Gears
and
Cover
The
timing gears are mounted at the front of the
engine. Camshaft drive is through helical-cut
timing gears; a steel gear on the crankshaft and a
pressed fiber gear on the camshaft. The gears are keyed to their respective shafts. The camshaft
driven
gear is secured on the front end of the
camshaft by means of a capscrew and a plain
washer.
The crankshaft gear is secured on the
front end of the crankshaft by a nut threaded
onto
the front end of the crankshaft holding the
crank
shaft pulley, crankshaft oil slinger, and the
crank
shaft drive gear spacer. The timing gears are
lubricated
through a jet threaded into the
crank
case directly above the gear contact and oil supplied
through a drilled passage from the front main
bearing.
The timing gears are enclosed by the
sealed timing cover. The oil seal in the cover bears 53