mirror 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 88 of 376
Pi
DAUNTLESS
¥-6
ENGINE
which
would cause rings to seat improperly or have
excessive clearance in
ring
grooves. Damaged or
faulty
pistons should be replaced,
c.
Inspect bearing surfaces of piston pins and check
for
wear by measuring worn and unworn surfaces
with
a micrometer. Rough or worn pins should be
replaced.
Test fit the piston pins in piston
bosses.
Occasionally,
a pin
will
be tight due to gum or
varnish
deposits.
This
may be corrected by remov
ing
the deposit with a suitable solvent. If piston
bosses
are worn out-of-round or oversize, the piston
and
pin assembly must be replaced. Oversize pins
are
not
practical,
since the pin must be a press fit
in
the connecting rod bore. Piston pins must fit the
piston with an easy finger push at
70°F.
[21°C.].
They
should have .0004" to .0007"
[0,0178
a
0,0102
mm.] clearance.
Dl-46.
Piston Fitting
If
cylinder bores are rebored or heavily honed,
new and possibly oversize diameter pistons must be
installed.
A new piston must be fitted to its cylinder
bore.
A satisfactory method of fitting pistons is as
follows.
a.
Expand
a
telescope
gauge
to fit the cylinder bore at right angles to the piston pin and
between
1
Vi"
to 2" [3,7 a 5,1 cm.] from the top.
b.
Measure diameter of the piston to be fitted, as
shown in
Fig.
Dl-15. The piston must be measured
at
right angles to the piston pin, W [6,3 mm.] below the oil
ring
groove. The piston must be be-
FIG.
Dl-15—MEASURING
PISTON
1—90°
tween .001" and .0015" [0,025 a
0,038
mm.]
smaller
than the cylinder bore.
Note:
Both cylinder block and piston must be at
very
nearly the same temperature when measure
ments are made or
errors
due to expansion
will
occur.
A difference of 10°F.
[5,6°C]
between
parts
is sufficient to produce a variation of .0009"
[0,0023
mm.].
The
pistons are cam-ground, which means that the
diameter at a right angle to the piston pin is
greater
than the diameter
parallel
to the piston
pin.
When a piston is checked for size, it must be
measured
with a micrometer applied to the
skirt
along a line
perpendicular
to axis of the piston pin.
Dl-47.
Piston Ring Fitting
When
new piston rings are to be installed without
reboring
cylinders,
the glazed cylinder walls should
be slightly dulled. However, cylinder bore diameter
should
not increase more than necessary.
Cylinder
walls
should be honed with the finest grade of
stone
to remove any glaze.
New compression rings must be checked for clear ance in piston
grooves
and for gap in cylinder bores;
however, the flexible oil rings are not checked for gap. The cylinder bores and piston
grooves
must
be clean, dry, and free of carbon and
burrs.
With
rings installed on piston, check clearance in
grooves
by inserting feeler
gauge
between
each
ring
and
its lower
land.
Any
ring
groove
wear
will
form
a
step
at inner portion of the lower
land.
If the
piston
grooves
have worn enough that relatively
high
steps
exist on the lower lands, the piston
should
be replaced because the
steps
will
interfere
with
proper operation of new rings and the
ring
clearances
will
be excessive. Piston rings are not
furnished
in oversize widths to compensate for
ring
groove
wear.
When
fitting new rings to new pistons, the side
clearance
of the compression rings should be .002" to .0035"
[0,051
a
0,089
mm.] for number one (1)
ring,
.003" to .005" [0,076 a 0,127 mm.] for number
two (2)
ring,
and side clearance of the oil
ring
should
be .0015" to .0085" [0,038 a
0,220
mm.].
To
check the end gap of a compression
ring,
place
it
in the cylinder in which it
will
be used, square
it
in the bore by tapping with the lower end of
a
piston, then measure the gap with a feeler
gauge.
A
compression
ring
should not have
less
than .015"
[0,381
mm.] gap when placed in cylinder
bore.
If gap is
less
than specified value, file the
end of the
ring
carefully with a fine file to obtain
proper
gap.
Dl-48.
Piston and Connecting Rod Assembly
Note:
A connecting rod can spring out of alignment
in
shipping or handling. Always check a new con
necting rod for misalignment before installing pis
ton and pin.
a.
If a new connecting rod is to be installed, check
its alignment with an accurate rod alignment fix
ture.
b.
If the piston and connecting rod assembly is
to be installed in the left cylinder bank, it must be assembled as shown in
Fig.
Dl-16. If the piston and
connecting rod assembly is to be installed in the
right
cylinder bank, it must be assembled as shown
in
Fig. Dl-17.
Note
that
these
two assemblies are
mirror-images
of each other.
c.
Lubricate
piston pin to avoid damage when
pressing
through the connecting rod.
d.
To install piston pin in piston and connecting
rod,
use
Tool
Set W-338.
Install
collar J-6047-5,
spring
J-6047-3, and pilot J-6047-20 into the base
support
J-6047-1 and place in
arbor
press. Using
driver
J-6047-4 press piston pin into piston and 88
Page 351 of 376
'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL
T
BODY
Contents
SUBJECT
PAR.
Brake
and
Clutch
Pedal Pads T-7
Canvas
Tops T-5
Care
of
Fabric
Tops. : T-6
Front
Seat Adjustment. . . T-8
Passenger Seat Safety
Catch
. .T-9
Windshield
T-2, T-3
Windshield
Glass and Weatherstrip T-4
T-1.
GENERAL
The
body
is of
all
steel construction with mountings
that provide a secure attachment to the frame.
All
major panels are of No. 18
gauge
steel. All
open
edges
of the panels are turned under, reinforced
and
flanged to provide strength. These panels are reinforced with
"U"
sections
and welded. All com
ponent
panels are seamed and welded
together.
The
body
is insulated from the frame with insulator shims placed
between
the
body
and frame and
held in position by the
body
bolts.
The
instruments and controls, mounted on the
instrument panel are within clear view and easy
to reach.
Note:
A new floor pan cover plate has
been
released on late CJ-5 and CJ-6 models, that is
identified by a stamped oval-shaped bubble or
relief, located to the right of the accelerator treadle.
FIG.
T-l—MODEL CJ-3B BODY
1—
Rear
Passenger Seat 8—Front Passenger Seat
2—
Left
Side
Panel
9—Right Side
Panel
3—
Driver's
Seat 10—Spare Wheel
Bracket
4—
Rear
View
Mirror
11—Right
Tail
Gate
Chain
5—
Windshield
12—Tail
Gate
6—
Cowl
13—Left
Tail
Gate
Chain
7— Step
351