Toyota 4-Runner 1985 Repair Manual page 451

AUTOMATIC TRANSMISSION - Component Groups (Front Clutch)
AT-49
INSPECTION OF FRONT CLUTCH
INSPECT FRONT CLUTCH PISTON
(a) Check that check ball is free by shaking the piston.
(b) Check that the valve does not leak by applying low-
pressure compressed air.
NOTE: Do not allow the discs to dry out. Prepare new
discs by soaking them at least two hours in ATF.
ASSEMBLY OF FRONT CLUTCH
(See page AT-47)
1 .
INSTALL NEW O-RINGS ON PISTON
2. INSTALL PISTON IN FRONT CLUTCH DRUM
Press the piston into the housing with the cup side up
(check ball down).
Be careful not to damage the O-rings.
3. INSTALL EIGHTEEN PISTON RETURN SPRINGS,
SPRING RETAINER AND SNAP RING IN PLACE
4. COMPRESS RETURN SPRINGS AND INSTALL SNAP RING
SST
IN GROOVE
(a) Place SST on the spring retainer, and compress the
spring on a shop press.
SST 09350-20013
(b) Install the snap ring with a screwdriver.
Be sure the end gap of the snap ring is not aligned
with the spring retainer claw.
5. INSTALL DISCS AND PLATES WITHOUT ASSEMBLING
THINNER SNAP RING
6.
(a) Do not assemble the thinner snap ring yet.
(b) Using low-pressure compressed air, blow all excess
A TF from the discs. For measurement of the clutch
pack, install all plates and discs (temporarily without
thinner snap ring):
CAUTION: High-pressure air will damage the discs.
Install in order: Plate-disc-plate-disc-plate-disc-plate-
{no snap ring)-disc
CHECK PISTON STROKE OF FRONT CLUTCH
(a) Install the rear clutch hub and outer snap ring.
(b) Install the front clutch drum onto the overdrive case.
Using a dial indicator, measure the stroke applying and
releasing the compressed air (4 - 8 Kg/cm2,
57 -
114
psi or
392 -
785 kPa).
Standard piston stroke: 1.32-2.66 mm
(0.0520 - 0.1047 in.)
If the stroke exceeds the limit, the clutch pack is probably
worn. If stroke is less than the limit, parts may be misas-
sembled or there may be excess ATF on the discs.