Procedure In Replacement Of Primary And Secondary Pulley, Or In Replacement Of Primary Pulley, Secondary Pulley And Variator Chain

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Measure depth "Lp" from the ST upper face to the primary pulley bearing catch surface at several points and calculate the average.
Preparation tool:

ST: GAUGE (499575400)

Courtesy of SUBARU OF AMERICA, INC.
Measure the depth "Ls" from the ST upper face to the secondary pulley bearing catch surface at several points and calculate the average.
Preparation tool:

ST: GAUGE (499575400)

Courtesy of SUBARU OF AMERICA, INC.

Calculate the following formula.

Calculation formula:

T (mm) = B - A + Lp - Ls -31.079

[T (in) = B - A + Lp - Ls - 1.224]

T: Pulley alignment

A: Specified primary pulley dimension

B: Specified secondary pulley dimension

Lp: Depth from the ST upper face to the primary pulley bearing catch surface

Ls: Depth from the ST upper face to the secondary pulley bearing catch surface

31.079 mm (1.224 in): Constant

Pulley alignment T mm (in)	Thickness of shim mm (in)
-0.034 - 0.049 (-0.002 - 0.002)	No shims
0.050 - 0.149 (0.002 - 0.006)	0.1 (0.004)
0.150 - 0.249 (0.006 - 0.010)	0.2 (0.008)
0.250 - 0.349 (0.010 - 0.014)	0.3 (0.012)
0.350 - 0.449 (0.014 - 0.018)	0.4 (0.016)
0.450 - 0.549 (0.018 - 0.022)	0.5 (0.020)
0.550 - 0.649 (0.022 - 0.026)	0.6 (0.024)
0.650 - 0.749 (0.026 - 0.029)	0.7 (0.028)
0.750 - 0.849 (0.029 - 0.033)	0.8 (0.031)
0.850 - 0.949 (0.033 - 0.037)	0.9 (0.035)
0.950 - 1.049 (0.037 - 0.041)	1.0 (0.039)
1.050 - 1.149 (0.041 - 0.045)	1.1 (0.043)
1.150 - 1.191 (0.045 - 0.047)	1.2 (0.047)

Select one to two shims so that the total thickness meets the value obtained from step 3).

Part No.	Shim thickness mm (in)
32451AA050	0.1 (0.004)
32451AA060	0.2 (0.008)
32451AA070	0.3 (0.012)
32451AA080	0.4 (0.016)
32451AA090	0.5 (0.020)
32451AA100	0.6 (0.024)