Reduction Drive Gear: Adjustment

Install the transmission case, and secure it with four or five bolts.
Tightening torque:

22 N.m (2.2 kgf-m, 16.2 ft-lb)
Measure depth "A" from the ST upper face to the reduction drive gear end face.
ST 499575400 GAUGE

Fig 1: Measuring Depth "A" From ST Upper Face To Reduction Drive Gear End Face Using Gauge
Courtesy of SUBARU OF AMERICA, INC.
Raise and hold the reduction drive gear.

Fig 2: Raising Reduction Drive Gear
Courtesy of SUBARU OF AMERICA, INC.
Measure depth "B" from the ST upper face to the reduction drive gear end face.
ST 499575400 GAUGE

Fig 3: Measuring Depth "B" From ST Upper Face To Reduction Drive Gear End Face Using Gauge
Courtesy of SUBARU OF AMERICA, INC.

Obtain the thickness of reduction drive gear shim using the following formula to select one to three reduction drive gear shims.

T (mm) = A - B - (0.05 - 0.25)

[T (in) = A - B - (0.002 - 0.01)]

T: Reduction drive gear shim thickness

A: Depth from the ST upper face to the reduction drive gear end surface

B: Depth from the ST upper face to the reduction drive gear end surface 0.05 - 0.25 mm (0.002 - 0.01 in): Clearance

Part No.	Reduction drive gear shim thickness mm (in)
31288AA260	0.3 (0.012)
31288AA270	0.4 (0.016)
31288AA280	0.5 (0.020)
31288AA290	0.6 (0.024)