Forward and Overrun Clutches

FORWARD AND OVERRUN CLUTCHES:

FORWARD AND OVERRUN CLUTCHES / Disassembly and Assembly
Forward and overrun clutches are serviced essentially the same way as reverse clutch is serviced. However, note the following exceptions.

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
While holding overrun clutch piston, gradually apply compressed air to oil hole.

Remove overrun clutch from forward clutch.

Removal and installation of return springs

Return Springs:

Inspection of forward clutch and overrun clutch return springs

Inspection of forward clutch drive plates

FORWARD CLUTCH:

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

OVERRUN CLUTCH:

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
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.

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

OVERRUN CLUTCH:

Specified clearance:
Standard 1.0 - 1.4 mm (0.039 - 0.055 inch)
Allowable limit : 2.4 mm (0.094 inch)

Measurement of clearance between retaining plate and snap ring of forward clutch

FORWARD CLUTCH:

Specified clearance:
Standard 0.35 - 0.75 mm (0.0138 - 0.0295 inch)

Allowable limit:
VG33E : Model 4FXOO (2WD) 2.15 mm (0.085 inch)
VG33E : Model 4FX01 (4WD) 2.15 mm (0.085 inch)

VG33ER : Model 4FX02 (2WD) 2.15 mm (0.085 inch)
VG33ER : Model 4FX03 (4WD) 2.35 mm (0.093 inch)