Suzuki Wagon R Manual page 798

4) Remove rear clutch balancer (1) and rear clutch return spring
seat (2).
5) Remove rear clutch piston (3).
If piston does not pop out, blow compressed air through input
shaft oil hole to remove piston.
6) Remove D-ring, and oil seals from input shaft subass'y (4).
INSPECTION
Clutch Discs, Plates and Flange
Check that sliding surfaces of discs, plates and flanges are not worn
or burnt. If necessary, replace.
NOTE:
D If disc lining is exfoliated or discolored, replace all discs.
D Before assembling new discs, soak them in A/T fluid for at
least two hours.
Rear Clutch Return Spring Seat
Measure height of overdrive clutch return spring.
Specified value: 22.01 mm (0.867 in.)
NOTE:
D Do not apply excessive force when measuring spring height.
D Perform measurement at several points.
AUTOMATIC TRANSMISSION (4 A / T) 7B-87