7. 3-4 Clutch

3-4 CLUTCH
Preparation





SST

Preinspection
3-4 Clutch Operation





1. Remove the thrust bearing.
2. Install the SST to the 3-4 clutch.
3. Check the 3-4 clutch operation by applying compressed air as shown.

Air pressure: 390 kPa (4.0 kgf/cm2, 57 psi) max.

Clearance





1. Measure the clearance between the retaining plate and the snap ring. Make several measurements and calculate the average value. If the clearance is not within specification, replace parts as necessary.
2. Select and install the correct retaining plate when assembling.

Clearance: 1.3 - 1.5 mm (0.051 - 0.059 inch)

Disassembly/Inspection/Assembly





1. Disassemble in the order shown in the figure, referring to Disassembly Note.
2. Assemble in the reverse order of disassembly, referring to Assembly Procedure.

Disassembly Note
Snap Ring





1. Install the SSTs to the 3-4 clutch as shown.

CAUTION: Depress the piston return spring only enough to remove the snap ring. Overpressing will damage the retainer assembly edges.

2. Compress the spring retainer and the return spring.
3. Remove the snap ring.
4. Remove the SSTs, then remove the spring retainer and the return spring.

3-4 Clutch Piston





Remove the 3-4 clutch piston by using the SST and compressed air.

Air pressure: 390 kPa (4.0 kgf/cm2, 57 psi) max.

Inspection
Drive Plates





1. Measure the facing thickness in three places, and calculate the average value.

Standard: 1.6 mm (0.063 inch)
Minimum: 1.4 mm (0.055 inch)

2. If not within specification, replace the drive plates.

Return Spring





1. Measure the spring free length.





Specifications

2. If not within the specifications, replace the spring.

3-4 Clutch Piston





1. Verify that there is no air leakage when applying compressed air through the oil hole opposite the return spring.
2. Verify that there is air flow when applying compressed air through the oil hole on the return spring side.

Air pressure: 390 kPa (4.0 kgf/cm2, 57 psi) max.

3. Replace the 3-4 clutch piston if damaged or malfunctioning.

Assembly Procedure





1. Install the 3-4 clutch piston.
1. Apply ATF to the inner and outer seals, and install them onto the 3-4 clutch piston.
2. Install the piston by pushing evenly around the circumference, being careful not to damage the seal rings.

Seal ring inner diameter
Inner seal: 59.0 mm (2.32 inch)
Outer seal: 105.5 mm (4.154 inch)





2. Install the return spring and spring retainer.
3. Install the SST to the 3-4 clutch as shown.

CAUTION: Depress the return spring only enough to install the snap ring. Overpressing will damage the retainer assembly edges.

4. Compress the return spring and spring retainer.





5. Install the snap ring.
6. Remove the SST.





7. Install the drive and driven plates in the following order.
Driven-Drive-Driven-Drive-Driven-Drive-Driven-Drive
8. Install the retaining plate.
9. Install the snap ring.





10. Measure the clearance between the retaining plate and the snap ring. Make several measurements and calculate the average value. If the clearance is not within specification, adjust it by selecting a proper retaining plate from below.

3-4 clutch clearance: 1.3 - 1.5 mm (0.051 - 0.059 inch)





Retaining plate





11. Install the SST as shown, and check clutch operation by applying compressed air.

Air pressure: 390 kPa (4.0 kgf/cm2, 57 psi) max.





12. Apply petroleum jelly to the thrust bearings and secure them to both sides of the 3-4 clutch drum.

Thrust bearing outer diameter Carrier hub side: 56.0 mm (2.20 inch)
Bearing race outer diameter Output shell side: 71.0 mm (2.80 inch)