Subaru 2009 IMPREZA Service Manual page 1977

(2) Piston stroke calculation
Calculate with A and B dimensions recorded
before. If the calculated value exceeds the ser-
vice limits, replace the drive plate and select
and adjust the retaining plate to be within initial
standard values.
T = A + B
T: Piston stroke
A: Amount of drive plate compression
B: Clearance between retaining plate and snap
ring
Initial standard:
2.0 — 2.3 mm (0.079 — 0.091 in)
Limit thickness:
2.6 mm (0.102 in)
Retaining plate
Part No.
31567AA710
31567AA720
31567AA730
31567AA740
31567AA670
31567AA680
31567AA690
31567AA700
AT Main Case
Thickness mm (in)
4.7 (0.185)
4.8 (0.189)
4.9 (0.193)
5.0 (0.197)
5.1 (0.201)
5.2 (0.205)
5.3 (0.209)
5.4 (0.213)
4AT-121
AUTOMATIC TRANSMISSION
13) Measure the clearance between the high clutch
retaining plate and snap ring. (Turbo model) At this
time, do not press down the retaining plate.
Initial standard:
0.8 — 1.1 mm (0.031 — 0.043 in)
Limit thickness:
1.5 mm (0.059 in)
(A)
(A) Thickness gauge
If the clearance exceeds the service limits, replace
the drive plate, then select and adjust the retaining
plate so that the clearance is within default stan-
dard values.
High clutch retaining plate
Part No.
31567AA710
31567AA720
31567AA730
31567AA740
31567AA670
31567AA680
31567AA690
31567AA700
14) Selection of the reverse clutch retaining plate
(1) Place the dish plate, driven plate, drive plate
and retaining plate neatly in this order on sur-
face table.
(2) Set the dial gauge to retaining plate, and
read its scale.
NOTE:
The value, which is read in the gauge at this time, is
zero point.
(3) Scale and record the weight "Z" of the flat
board that will be placed on the retaining plate.
NOTE:
• Use a stiff board which does not bend against
load as a flat board to be put on retaining plate.
• Use a flat board weighing less than 15.3 kg (33.7 lb).
AT-00249
Thickness mm (in)
4.7 (0.185)
4.8 (0.189)
4.9 (0.193)
5.0 (0.197)
5.1 (0.201)
5.2 (0.205)
5.3 (0.209)
5.4 (0.213)