Subaru Impreza 2003 Service Manual page 1618

AUTOMATIC TRANSMISSION
3) Using the special tool, measure the distance "B"
between the mating surface of transmission case
and reduction drive gear edge.
ST 398643600 GAUGE
ST
B
B: Measured value
4) Formula:
NOTE:
• Calculation of "T":
When clearances are 0.05 mm (0.0020 in), select
up to four adjusting shims from the table, suitable
for clearance value.
When clearances are 0.05 mm (0.0020 in)
T = A − B + 0.40 mm
[T = A − B + 0.0157 in]
When clearances are 0.25 mm (0.0098 in)
T = A − B + 0.20 mm
[T = A − B + 0.0079 in]
T: Shim clearance
A: Distance between extension case edge and rear
driveshaft edge
B: Distance between transmission case edge and
reduction drive gear edge
T: Shim thickness
0.05 — 0.25 mm (0.0020 — 0.0098 in)
Example:
When, A = 90.50 mm (3.5630 in), B = 90.35 mm
(3.5571 in)
Calculation for 0.05 mm (0.0020 in) of clearance
T = 90.50 − 90.35 + 0.4 = 0.55
[T = 3.5630 − 3.5571 + 0.0157 = 0.0216]
Calculation when clearance is 0.25 mm (0.0098 in)
T = 90.50 − 90.35 + 0.2 = 0.35
[T = 3.5630 − 3.5571 + 0.0079 = 0.0138]
• Calculation formula for "T" is applied when mea-
suring using ST (398643600 GUAGE). When not
using ST, apply
T = (A − α + 0.45 mm) − (B − β) − H
[T = (A − α + 0.0177 in) − (B − β) − H].
T: Thrust needle bearing thickness
A: Distance from end of extension case to end of
reduction drive shaft
B: Distance from end of transmission case to end of
rear drive shaft
TRANSFER CLUTCH
α: Collar thickness used when measuring "A"
β: Collar thickness used when measuring "B"
0.45: Gasket thickness (mm)
H: Shim clearance
After calculation, the value of "T" becomes between
0.35 mm (0.0138 in) and 0.55 mm (0.0216 in),
therefore select two shims with thickness of 0.2 mm
(0.010 in) or one shim with thickness of 0.5 mm
(0.020 in).
AT-01032
4AT-86
Adjusting shim
Part No.
33281AA001
33281AA011
Thickness mm (in)
0.2 (0.008)
0.5 (0.020)