High Clutch And Reverse Clutch

WARNING: This page is about a different variant/trim than selected.

Install the seal ring and lip seal to the high clutch piston and reverse clutch piston.
Install the high clutch piston to the reverse clutch piston.

Fig 1: Identifying High Clutch Piston
Courtesy of SUBARU OF AMERICA, INC.
Install the reverse clutch piston to the high clutch drum. Align the groove on reverse clutch piston with the groove on high clutch drum during installation.

Fig 2: Identifying Reverse Clutch Piston
Courtesy of SUBARU OF AMERICA, INC.
Install the spring retainer to the high clutch piston.

Fig 3: Identifying Spring Retainer
Courtesy of SUBARU OF AMERICA, INC.
Attach the ST to the high clutch piston.
ST 498437000 HIGH CLUTCH PISTON GUIDE

Fig 4: Identifying ST 498437000 High Clutch Piston Guide
Courtesy of SUBARU OF AMERICA, INC.
Install the cover to the high clutch piston while making sure not to bend the high clutch piston seal.
Install the snap ring using ST1 and ST2.
ST1 398673600 COMPRESSOR

ST2 498627100 SEAT

ST3 498437000 HIGH CLUTCH PISTON GUIDE

Fig 5: Identifying Snap Ring, ST 1, 2, And 3
Courtesy of SUBARU OF AMERICA, INC.
Place the dish plate, driven plate, drive plate and retaining plate neatly in this order on surface table.
Set the micro gauge to retaining plate, and read its scale.
NOTE: The value, which is read in the gauge at this time, is zero point.
Scale and record the weight "Z" of a flat board which will be put on 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 250 N (25.5 kgf, 56.2 lb).
Put the flat board on retaining plate.

Fig 6: Putting Flat Board On Retaining Plate
Courtesy of SUBARU OF AMERICA, INC.
Using the following formula, read the push/pull gauge, and calculate "N".
N = 250 N (25.5 kgf, 56.2 lb) - Z

N: Value indicated on push/pull gauge

250 N (25.5 kgf, 56.2 lb) : Load applied to clutch plate

Z: Flat board weight
Press the center of retaining plate by applying a force of N using push/pull gauge, and then measure and record the height A. Measure at three locations or more spaced by equal distances and take the average value.
NOTE: If measuring in three locations, measure every 120°. If measuring in four locations, measure every 90°.

Fig 7: Measuring Flat Board Weight
Courtesy of SUBARU OF AMERICA, INC.
Install the thickest driven plate to piston side, and then install the driven plate, drive plate, retaining plate to high clutch drum.

Fig 8: Identifying Driven Plate, Drive Plate And Retaining Plate
Courtesy of SUBARU OF AMERICA, INC.
Install the snap ring to high clutch drum.
Apply compressed air intermittently to check for operation.

Fig 9: Installing Snap Ring
Courtesy of SUBARU OF AMERICA, INC.
Measure and record the clearance B between the retaining plate and snap ring. (High clutch) At this time, do not press down the retaining plate.

Fig 10: Measuring Clearance Between Retaining Plate And Snap Ring
Courtesy of SUBARU OF AMERICA, INC.

Piston stroke calculation

Calculate with A and B dimensions recorded before. If the calculated value exceeds the service limit, replace the drive plate with a new part and adjust it within the initial specification.

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)

THICKNESS SPECIFICATIONS

High clutch retaining plate
Part number	Thickness mm (in)
31567AA710	4.7 (0.185)
31567AA720	4.8 (0.189)
31567AA730	4.9 (0.193)
31567AA740	5.0 (0.197)
31567AA670	5.1 (0.201)
31567AA680	5.2 (0.205)
31567AA690	5.3 (0.209)
31567AA700	5.4 (0.213)

Place the dish plate, driven plate, drive plate and retaining plate neatly in this order on surface table.
Set the micro gauge to retaining plate, and read its scale.
NOTE: The value, which is read in the gauge at this time, is zero point.
Scale and record the weight "Z" of a flat board which will be put on 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 of its weight less than 150 N (15.3 kgf, 33.7 lb).
Put the flat board on retaining plate.

Fig 11: Putting Flat Board On Retaining Plate
Courtesy of SUBARU OF AMERICA, INC.
Using the following formula, read the push/pull gauge, and calculate "N".
N =150 N (15.3 kgf, 33.7 lb) - Z

N: Value indicated on push/pull gauge

150 N (15.3 kgf, 33.7 lb) : Load applied to clutch plate

Z: Flat board weight
Press the center of retaining plate by applying a force of N using push/pull gauge, and then measure and record the height A. Measure at three locations or more spaced by equal distances and take the average value.
NOTE: If measuring in three locations, measure every 120°. If measuring in four locations, measure every 90°.

Fig 12: Measuring Flat Board Weight
Courtesy of SUBARU OF AMERICA, INC.
Install the driven plate, drive plate, retaining plate and snap ring.

Fig 13: Installing Driven Plate, Drive Plate, Retaining Plate And Snap Ring
Courtesy of SUBARU OF AMERICA, INC.
Apply compressed air intermittently to check for operation.

Fig 14: Applying Compressed Air
Courtesy of SUBARU OF AMERICA, INC.
Measure and record the clearance B between the retaining plate and snap ring. (Reverse clutch) At this time, do not press down the retaining plate.

Fig 15: Measuring Clearance Between Retaining Plate And Snap Ring
Courtesy of SUBARU OF AMERICA, INC.