1995 JEEP YJ oil pressure

the front bumper and radiator support be removed
for access to the cooler lines and attaching bracket.
REVERSE FLUSHING MAIN AND AUXILIARY
COOLERS AND COOLER LINES
Reverse flushing the cooler and lines will prevent
sludge and particles from flowing back into the
transmission after repair. The flushing procedure ap-
plies to standard (in-radiator) coolers and auxiliary
coolers equally.
Pressure equipment is preferred for reverse flush-
ing. However, reverse flushing can be performed us-
ing hand operated equipment as described in the
following procedure.
(1) Disconnect cooler lines at transmission and at
auxiliary cooler (Figs. 48 and 49).
(2) Position drain pan under cooler line to catch
material flushed through coolers and lines.
(3) Reverse flush each cooler using hand operated
suction gun filled with mineral spirits. Insert gun
nozzle (or hose) into cooler inlet (return) line. Then
force mineral spirits through into line and through
cooler.
(4) Continue reverse flushing until fluid exiting in-
let (pressure) line is clear and free of debris/residue.
(5) Replace radiator if fluid cannot be pumped
through main cooler. Replace auxiliary cooler if leaks
are evident, or if fluid cannot be pumped through it.
(6) Clear flushing materials from coolers and lines
with short pulses of compressed air. Insert air gun
nozzle into cooler inlet (return) line and continue
short pulses of air until all fluid is cleared from
cooler and lines.(7) Pump one quart of fresh automatic transmis-
sion fluid through cooler and lines before reconnect-
ing cooler lines.
FLOW TESTING TRANSMISSION MAIN
COOLER
Cooler flow is checked by measuring the amount of
fluid flow through the cooler in a 20 second time pe-
riod. The test is performed with the engine running
and transmission in neutral. Fluid is then pumped
through the cooler by the transmission oil pump.
(1) Disconnect cooler inlet line at transmission fit-
ting.
(2) Securely attach hose to end of inlet line and po-
sition line in a one quart test container.
(3) Add extra quart of fluid to transmission.
(4) Use stopwatch to check flow test time.
(5) Shift transmission into neutral and set parking
brake.
(6) Start and run engine at curb idle speed and im-
mediately note cooler flow. Approximately one quart
of fluid should flow into test container in 20 second
period.
(7) If cooler flow is intermittent, flows less than
one quart in 20 seconds, or does not flow at all,
cooler is faulty and must be replaced.
TRANSMISSION COOLER LINE FITTINGS
Quick connect fittings are used at the transmission
cooler line connections. The fitting seals and guides
are serviceable.
Replace the seals and guides whenever the fittings
exhibit leakage, or will not properly snap into place.
Fig. 49 Auxiliary Cooler Mounting (Right Hand Drive)
JAW-4 IN-VEHICLE SERVICE 21 - 197

AW-4 TRANSMISSION OVERHAUL
INDEX
page page
Cleaning and Inspection................... 214
Direct Clutch Overhaul.................... 228
First-Reverse Brake Piston and Transmission Case
Overhaul............................. 247
Forward Clutch Overhaul................... 232
Front Planetary Gear Overhaul.............. 237
Manual Valve Shaft Overhaul............... 215
Oil Pump Overhaul....................... 216
Overdrive Planetary Gear and Clutch Overhaul . . 218Overdrive Support Overhaul................ 226
Overhaul Service Tools.................... 201
Rear Planetary, No. 2 One-Way Clutch and Output
Shaft Overhaul......................... 244
Second Brake Overhaul................... 241
Sun Gear and No. 1 One-Way Clutch Overhaul . . 238
Transmission Assembly and Adjustment........ 265
Transmission Disassembly................. 201
Transmission Valve Body Overhaul........... 250
OVERHAUL SERVICE TOOLS
The special tools needed to overhaul the AW-4
transmission are provided in Tool Kit 6294. However,
Pressure Test Port Adapter 7554 is not included in
this kit and must be ordered separately. The over-
haul tool kit and test port adapter are available
through the parts division and dealer special tool
program.
TRANSMISSION DISASSEMBLY
(1) Remove torque converter.
(2) Remove lower half of filler tube if not previ-
ously removed.
(3) Remove clamps attaching wire harness and
throttle cable (Fig. 1) to transmission.(4) Remove shift lever from manual valve shaft at
left side of transmission.
(5) Remove park/neutral position switch.
(6) Remove speed sensor (Fig. 2).
Fig. 1 Typical Harness And Cable Clamp Attachment
Fig. 2 Speed Sensor Removal
JAW-4 TRANSMISSION OVERHAUL 21 - 201

(b) Mount dial indicator on clutch and position
indicator stylus on clutch piston (Fig. 6).
(c) Apply compressed air through clutch feed hole
in oil pump and note piston stroke length. Stroke
length should be 1.85 - 2.15 mm (0.0728 - 0.0846
in.).
(6) Replace clutch pack if stroke length is incor-
rect.
(7) Remove clutch pack snap ring and remove the
clutch pack.(8) Compress piston return spring with Tool 7538
(Fig. 8). Remove snap ring and remove compressor
tool.
(9) Remove compressor tool and piston return
springs.
(10) Mount oil pump on converter. Then mount
clutch on oil pump (Fig. 9).
(11) Hold clutch piston by hand and apply com-
pressed air through oil pump feed hole to ease piston
out (Fig. 9). Apply only enough air pressure to re-
move piston.
Fig. 6 Checking Overdrive Clutch Piston Stroke
Fig. 7 Removing Clutch Pack Snap Ring
Fig. 8 Removing Clutch Piston Snap Ring
Fig. 9 Removing Overdrive Clutch Piston
21 - 220 AW-4 TRANSMISSION OVERHAULJ

(2) Remove oil strainers (Fig. 2).
(3) Note or mark position of valve retainers and
pressure reducing plug clip for assembly reference
(Fig. 2). Do not remove the retainers at this time.
(4) Remove solenoid No. 1, 2 and 3. Discard sole-
noid O-rings.
(5) Remove 1-2 shift valve retainer (Fig. 3).
(6) Remove 1-2 shift valve plug, valve spring and
valve (Fig. 4).
(7) Remove primary regulator valve as follows:
WARNING: THE PRIMARY REGULATOR VALVE
SLEEVE AND PLUNGER ARE UNDER TENSION
FROM THE VALVE SPRING. EXERT COUNTER-
PRESSURE ON THE SPRING WHILE REMOVING
THE VALVE RETAINER TO PREVENT COMPONENTS
FROM FLYING OUT.(a) Note position of valve retainer for assembly
reference (Fig. 5). Then press valve sleeve inward
with your thumb and remove retainer with magnet.
(b) Slowly release thumb pressure on sleeve and
remove sleeve, spring and washer and valve (Fig.
6). Use magnet to remove valve if necessary.
(8) Remove regulator valve plunger from sleeve
(Fig. 7).
(9) Remove retaining clip and remove pressure re-
ducing plug (Fig. 8). Cover screwdriver blade with
tape to avoid scratching valve body surface.
(10) Remove accumulator control valve retainer
and remove control valve assembly (Fig. 9).
(11) Remove spring and control valve from valve
sleeve (Fig. 10).
(12) Clean lower body valve components with sol-
vent and dry them with compressed air only. Do not
Fig. 2 Valve Retainer And Clip Location
Fig. 3 Removing 1-2 Shift Valve Retainer
Fig. 4 Removing/Installing 1-2 Shift Valve
Fig. 5 Regulator Valve Retainer Position
JAW-4 TRANSMISSION OVERHAUL 21 - 253

use shop towels or rags. Lint or foreign material from
towels or rags can interfere with valve operation.
(13) Inspect condition of lower body components.
Replace lower body if any bores are scored or cor-
roded. Replace valves, plugs or sleeves that are
scored or worn. Replace oil strainers if cut, torn or
damaged in any way.
(14) Inspect valve body springs. Replace any spring
having rusted, distorted, or collapsed coils. Measure
length of each valve body spring. Replace any spring
if free length is less than length specified in following
chart (Fig. 11).
LOWER BODY ASSEMBLY
(1) Lubricate lower body components with auto-
matic transmission fluid.
(2) Install spring and accumulator control valve in
sleeve (Fig. 11). Then install assembled components
in lower body (Fig. 9).(3) Press accumulator control valve assembly into
valve bore and install retainer (Fig. 9).
(4) Install pressure reducing plug in plug bore.
Then secure plug with retaining clip (Fig. 8).
(5) Install washer on primary regulator valve
plunger (Fig. 12).
(6) Install primary regulator valve plunger in valve
sleeve (Fig. 7).
(7) Install valve spring and regulator valve sleeve
and plunger.
(8) Press regulator valve sleeve into bore and in-
stall retainer (Fig. 5 and 6). Be sure retainer is posi-
tioned in sleeve lugs as shown.
(9) Install 1-2 shift valve, spring and plug (Fig. 4).
Then press valve assembly into bore and install re-
tainer.
(10) Install replacement O-rings on solenoids and
install solenoids on valve body. Tighten solenoid at-
taching bolts to 10 Nzm (7 ft-lbs) torque.
(11) Install oil strainers (Fig. 13).Identify strain-
ers before installation. The three strainers are
all the same diameter but are different lengths.
Two strainers are 11.0 mm (0.443 in.) long while
one strainer is 19.5 mm (0.76 in.) long (Fig. 14).
(12) Install check valve and spring (Fig. 13).
(13) Install check ball and seat (Fig. 13).
(14) Install pressure relief valve and spring (Fig.
13).
Fig. 6 Removing/Installing Primary Pressure
Regulator Valve
Fig. 7 Removing/Installing Regulator Valve Plunger
Fig. 8 Removing/Installing Pressure Reducing Plug
21 - 254 AW-4 TRANSMISSION OVERHAULJ

(7) Remove second coast modulator valve retainer
and remove valve plug, spring and valve.
(8) Remove lock-up relay valve retainer and re-
move relay valve and sleeve assembly (Fig. 8).
(9) Remove relay valve, spring and plunger from
valve sleeve (Fig. 9).
(10) Remove secondary pressure regulator valve re-
tainer and remove plug, regulator valve and spring
(Fig. 10).
(11) Remove cut-back valve retainer and remove
plug, cut-back valve and spring (Fig. 11).
(12) Remove 2-3 shift valve retainer and remove
plug, spring and 2-3 shift valve (Fig. 12).
(13) Remove low coast modulator valve retainer
and remove valve plug, spring and low coast modula-
tor valve (Fig. 13).
(14) Clean the upper body components with solvent
and dry them with compressed air only. Do not use
shop towels or rags. Lint or foreign material from
towels or rags can interfere with valve operation.
(15) Inspect condition of the upper body compo-
nents. Replace the upper body if any of the bores are
scored or corroded. Replace any valves, plugs or
sleeves if scored or worn. Replace the oil strainer if
cut, torn or damaged in any way.
Fig. 7 Removing/Installing Second Coast Modulator
Valve
Fig. 8 Removing/Installing Converter Clutch Relay
Valve
Fig. 9 Relay Valve Components
21 - 258 AW-4 TRANSMISSION OVERHAULJ

TIRE CHAINS
Tire snow chains may be used on certain models.
Refer to Owner's Manual for more information.
CLEANING OF TIRES
Steam cleaning may be used for cleaning.
DO NOT use gasoline or wire brush for cleaning.
DO NOT use mineral oil or an oil-based solvent.
PRESSURE GAUGES
High-quality, dial-type, air-pressure gauges are rec-
ommended. After checking with the gauge, replace
valve cap and finger tight.
TIRE INFLATION PRESSURES
Under inflation (Fig. 2) causes rapid shoulder wear
and tire flexing.
Over inflation (Fig. 3) causes rapid center wear and
loss of the tire's ability to cushion shocks.
Improper inflation can cause;
²Uneven wear patterns
²Reduced tread life
²Reduced fuel economy
²Unsatisfactory ride
²Cause the vehicle to drift
Refer to the Owner's Manual for information re-
garding proper tire inflation pressure.
This pressure has been carefully selected to provide
for safe vehicle operation. Tire pressure should becheckedcoldonce per month. Tire pressure de-
creases when the outside temperature drops.
Inflation pressures specified on the placards are al-
wayscold inflation pressure. Cold inflation pres-
sure is obtained after the vehicle has not been
operated for at least 3 hours. Tire inflation pressures
may increase from 2 to 6 pounds per square inch
(psi) during operation.Do notreduce this normal
pressure build-up.
Vehicles loaded to the maximum capacity should
not be driven at continuous speeds above 75 mph
(120 km/h).
WARNING: OVER OR UNDER INFLATED TIRES CAN
AFFECT VEHICLE HANDLING AND CAN FAIL SUD-
DENLY, RESULTING IN LOSS OF VEHICLE CON-
TROL.
REPLACEMENT TIRES
OEM tires provide a proper balance of many fea-
tures such as;
²Ride
Fig. 1 Tire Size Identification
Fig. 2 Under Inflation Wear
Fig. 3 Over Inflation Wear
22 - 2 WHEELS AND TIRESJ

LIFTGATE SUPPORT ROD CYLINDER DISPOSALÐ
XJ
WARNING: SAFETY GOGGLES MUST BE WORN
DURING THE DISPOSAL PROCEDURE. THE HIGH
PRESSURE GAS CHARGE IN THE SUPPORT ROD
CYLINDERS WILL BE RELEASED DURING THE
PROCEDURE.
(1) Remove the support rod cylinder(s) from the
liftgate.
(2) Position the support rod cylinder horizontally
in a vise and clamp the cylinder securely.
(3) Wrap the cylinder with 4-5 layers of shop tow-
els.
(4) Measure 1 and 1/2 inches inward from the end
of the cylinder. Mark this location on the towels with
chalk. The cylinder will be punctured at this location
to release the gas charge.
(5) Use a punch and hammer to puncture cylinder.
Force the punch through towels and into the cylinder
with a hammer. Continue striking the punch until
the gas begins to escapebut do not remove the
punch.
(6) Hold the towels and punch in position until all
the gas has escaped. Complete de-pressurization will
require about 4 to 10 seconds. After all the gas has
escaped, slowly remove the punch.
(7) Hold a towel over the hole in cylinder and press
the support rod piston all the way into the cylinder
to purge remaining oil.
(8) Remove the support rod cylinder from the vise
and discard it.
(9) If both support rod cylinders are being re-
placed, repeat this procedure for the remaining cylin-
der.
LIFTGATE SUPPORT ROD BALL STUD
REPLACEMENTÐXJ
REMOVAL
(1) Open the liftgate.
(2) Support the liftgate in the open position.
(3) Remove the retainer clip that attaches the sup-
port rod and cylinder to the ball stud.
(4) Disconnect the support rod from the ball stud.
(5) Remove the ball stud from the liftgate with a
T-30 Torx-head socket wrench (Fig. 3).
INSTALLATION
(1) Install the replacement ball stud in the liftgate
with a T-30 Torx-head socket wrench. Tighten the
ball stud to 7 Nzm (62 in-lbs) torque.
(2) Connect the support rod to the ball stud.
(3) Secure the support rod to the ball stud with the
clip.
(4) Remove the support from the liftgate and test
the operation of support rod.
LIFTGATE ADJUSTMENTÐXJ
SERVICE INFORMATION
The position of the liftgate can be adjusted upward
or downward, and inward or outward by the use of
hinge shims. The liftgate stop bumpers must also be
adjusted if liftgate hinges are adjusted. The inward/
outward position of each stop bumper is adjusted by
the use of shims (Fig. 4).
ADJUSTMENT PROCEDURE
(1) To move the position of the liftgate inward or
outward, remove or add shims between the hinge-
halves and liftgate.
(2) To move the position of the liftgate upward or
downward, remove or add shims between the hinge-
halves and roof panel.
Fig. 2 Support Rod, Retainer Clips and Ball Studs
Fig. 3 Support Rod Ball Studs
JDOORSÐXJ 23 - 63