Forward and Over Run Clutches

DISASSEMBLY AND ASSEMBLY
Service procedures for forward and overrun clutches are essentially the same as those for reverse clutch, with the following exception:





- Check of forward clutch operation.





- Check of overrun clutch operation.





- Removal of forward clutch drum.
Remove forward clutch drum from transmission case by holding snap ring.





- Removal of forward clutch and overrun clutch pistons.
1. While holding overrun clutch piston, gradually apply compressed air to oil hole.





2. Remove overrun clutch from forward clutch.





- Removal and installation of return springs.








- Inspection of forward clutch and overrun clutch return springs Refer to the illustration for the inspection standard.





- Inspection of forward clutch drive plates.
Thickness of drive plate:
Standard: 1.52 - 1.67 mm (0.0598 - 0.0657 inch)
Wear limit: 1.40 mm (0.0551 inch)





- Inspection of overrun clutch drive plates.
Thickness of drive plate:
Standard: 1.90 - 2.05 mm (0.0748 - 0.0807 inch)
Wear limit: 1.80 mm (0.0709 inch)





- Installation of forward clutch piston and overrun clutch piston.
1. Install forward clutch piston by turning it slowly and evenly.
- Apply ATF to inner surface of clutch drum.
- Align notch in forward clutch piston with groove in forward clutch drum.





2. Install overrun clutch by turning it slowly and evenly.
- Apply ATF to inner surface of forward clutch piston.





- Measurement of clearance between retaining plate and snap ring of overrun clutch.
Specified clearance:
Standard: 1.0 - 1.4 mm (0.039 - 0.055 inch)
Allowable limit: 2.0 mm (0.079 inch)
Part No. and thickness of retaining plate:
31537-41X80: 4.2 mm (0.165 inch)
31537-41X81: 4.4 mm (0.173 inch)
31537-41X82: 4.6 mm (0.181 inch)
31537-41X83: 4.8 mm (0.189 inch)
31537-41X84: 5.0 mm (0.197 inch)





- Measurement of clearance between retaining plate and snap ring of forward clutch.
Specified clearance:
Standard: 0.35 - 0.75 mm (0.0138 - 0.0295 inch)
Allowable limit: 1.85 mm (0.728 inch)
Part No. and thickness of retaining plate:
31537-41X00: 8.0 mm (0.315 inch)
31537-41X01: 8.2 mm (0.323 inch)
31537-41X02: 8.4 mm (0.331 inch)
31537-41X03: 8.6 mm (0.339 inch)
31537-41X04: 8.8 mm (0.346 inch)
31537-41X05: 9.0 mm (0.354 inch)
31537-41X06: 9.2 mm (0.362 inch)