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OIL PUMP OVERHAUL
(1) Remove pump body O-ring (Fig. 1).
(2) Remove pump seal rings (Fig. 1).
(3) Remove bolts attaching stator shaft to pump
body and separate components.
(4) Remove drive gear and driven gear from pump
body (Fig. 1).
(5) Measure inside diameter of pump body bushing
with bore gauge or inside micrometer (Fig. 2). Diameter
should be maximum of 38.19 mm (1.5035 in.). Replace
pump body if bushing I.D. is greater than specified.
(6) Measure inside diameter of stator shaft bush-
ing (Fig. 2). Take measurements at front and rear of
bushing. Diameter should be maximum of 21.58 mm
(0.08496 in.) at front and 27.08 mm (1.0661 in.) at
Fig. 1 Oil Pump Components
Fig. 5 Installing Manual Shaft And Sector
Fig. 2 Checking Pump/Stator Shaft Bushings
21 - 216 AW-4 TRANSMISSION OVERHAULJ
Page 1594 of 2198
rear. Replace stator shaft if bushing diameter is
greater than specified.
(7) Measure oil pump clearances (Fig. 3).
²Clearance between pump driven gear and pump
body should be maximum of 0.3 mm (0.012 in).
²Clearance between tips of pump gear teeth should
be maximum of 0.3 mm (0.012 in).
²
Clearance between rear surface of pump housing and
pump gears should be maximum of 0.1 mm (0.004 in.).
(8) Replace pump body and gears if any clearance
is greater than specified.
(9) Remove old pump seal. Install new seal with
Seal Installer 7549 (Fig. 4).
(10) Lubricate and install gears in pump body.
(11) Assemble stator shaft and pump body. Tighten
shaft-to-body bolts to 10 Nzm (7 ft. lbs.) torque.
(12) Install new O-ring on pump body and new
seal rings on stator shaft.
Fig. 3 Checking Pump Gear ClearancesFig. 5 Checking Pump Gear Rotation
Fig. 4 Installing Pump Seal
JAW-4 TRANSMISSION OVERHAUL 21 - 217
Page 1595 of 2198
(13) Install pump in torque converter and check
pump gear rotation. Gears must rotate smoothly
when turned clockwise and counterclockwise.
(14) Lubricate pump O-ring and seal rings with pe-
troleum jelly.
OVERDRIVE PLANETARY GEAR AND CLUTCH
OVERHAUL
GEAR AND CLUTCH DISASSEMBLY
(1) Check operation of one-way clutch in clutch
drum. Hold drum and turn planetary shaft clockwise
and counterclockwise. Shaft should turn clockwise
freely but lock when turned counterclockwise. Re-
place one-way clutch if necessary.(2) Replace overdrive brake clutch pack if discs are
worn below thickness of 1.84 mm (0.0724 in.). This is
clutch pack that fits on clutch drum and in case.
Fig. 1 Overdrive Planetary Gear And Clutch Components
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Page 1596 of 2198
(3) Remove overdrive clutch from planetary gear
(Fig. 3).(4) Remove thrust bearing and race assembly from
clutch drum (Fig. 4).
(5) Measure stroke length of clutch piston as fol-
lows:
(a) Mount oil pump on torque converter. Then
mount clutch on oil pump (Fig. 5).
Fig. 2 Checking One-Way Clutch
Fig. 3 Removing Overdrive Clutch From Gear
Fig. 4 Removing Clutch Drum Bearing And Race
Fig. 5 Assembling Converter, Pump And Clutch For
Test
JAW-4 TRANSMISSION OVERHAUL 21 - 219
Page 1597 of 2198
(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
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(12) Remove bearing and race from ring gear (Fig.
10).
(13) Remove snap ring from ring gear and remove
ring gear hub (Fig. 11).(14) Remove race from planetary gear (Fig. 12).
(15) Remove snap ring and remove retaining plate
(Fig. 13).
Fig. 10 Removing Ring Gear Bearing And Race
Fig. 11 Removing Ring Gear Hub
Fig. 12 Remove Planetary Gear Race
Fig. 13 Removing Snap Ring And Retaining Plate
JAW-4 TRANSMISSION OVERHAUL 21 - 221
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(16) Remove one-way clutch and outer race as as-
sembly. Then separate race from clutch (Fig. 14).
(17) Remove planetary thrust washer (Fig. 15).
(18) Check overdrive clutch disc thickness. Mini-
mum allowable thickness is 1.84 mm (0.0724 in.).(19) Measure free length of piston return springs
with springs in retainer (Fig. 16). Length should be
16.8 mm (0.661 in.).
(20) Check clutch piston check ball (Fig. 17). Shake
piston to see if ball moves freely. Then check ball
sealing by applying low pressure compressed air to
ball inlet as shown. Air should not leak past check
ball.
Fig. 14 Removing One-Way Clutch
Fig. 15 Removing Planetary Thrust Washer
Fig. 16 Checking Piston Return Spring Length
Fig. 17 Testing Clutch Piston Check Ball
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(21) Check inside diameter of clutch drum bush-
ings with bore gauge or inside micrometer (Fig. 18).
Maximum inside diameter is 27.11 mm (1.0673 in.).
Replace drum if bushing inside diameter is greater
than specified.
(22) Check inside diameter of planetary gear bush-
ing (Fig. 19). Maximum inside diameter is 11.27 mm
(0.4437 in.). Replace planetary gear if bushing inside
diameter is greater then specified.
Assembling Gear And Clutch
(1) Install thrust washer in planetary gear (Fig.
20).Grooved side of washer faces up and to-
ward front.(2) Install one-way clutch in race (Fig. 21). Flanged
side of clutch must face upward as shown.
(3) Install assembled one-way clutch and outer
race in planetary gear. Be sure flanged side of clutch
is facing upward.
(4) Install clutch pack retaining plate and snap
ring in planetary gear.
(5) Coat planetary race with petroleum jelly and
install it on planetary gear. Outside diameter of race
is 41.8 mm (1.646 in.); inside diameter is 27.1 mm
(1.067 in.).
Fig. 18 Checking Clutch Drum Bushings
Fig. 19 Checking Planetary Bushing
Fig. 20 Install Planetary Thrust Washer
Fig. 21 Assembling One-Way Clutch And Race
JAW-4 TRANSMISSION OVERHAUL 21 - 223