3-4 Clutch
3-4 CLUTCHPreparation
SST
Preinspection
3-4 clutch operation
1. Install the SST to the 3-4 clutch.
2. Check the 3-4 clutch operation by applying compressed air as shown.
Air pressure:
392 kPa (4.0 kgf/cm2, 57 psi) max.
Clearance
Note: Make several measurements and calculate the average value.
1. Measure the clearance between the retaining plate and the snap ring.
Clearance:
1.3 - 1.6 mm (0.051 - 0.063 in)
2. If not as specified, replace parts as necessary.
3. Select and install the correct snap ring when assembling.
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.
3-4 Clutch:
Disassembly note
Snap ring
1. Install the SSTs to the 3-4 clutch as shown.
2. Depress the spring retainer and return spring.
3. Remove the snap ring.
4. Remove the SSTs and remove the spring retainer and return spring.
3-4 clutch piston
Remove the 3-4 clutch piston by using the SST and compressed air.
Air pressure:
392 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 in)
Minimum: 1.4 mm (0.055 in)
2. If not within specification, replace the drive plate.
Return spring
Note: Do not compress the spring when measuring it with vernier calipers.
1. Measure the spring free length.
Specifications
2. If not within specification, 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 return spring side.
Air pressure:
392 kPa (4.0 kgf/cm2, 57 psi) max.
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: 53.5 mm (2.106 in)
Outer seal: 98.0 mm (3.858 in)
2. Install the return spring and spring retainer.
3. Install the SSTs to the 3-4 clutch as shown.
Caution: Depress the return spring only enough to install the snap ring.
4. Depress the return spring and spring retainer.
Caution:
^ Do not align the snap ring end gap with the return spring stop.
^ Do not deform the snap ring when installing it.
5. Install the snap ring.
6. Remove the SSTs.
Caution: Installation order: Driven-Drive-Driven-Drive-Driven-Drive
7. Install the drive and driven plates.
8. Install the retaining plate.
Caution:
^ Do not align the snap ring end gap with the return spring stop.
^ Do not deform the snap ring when installing it.
9. Install the snap ring.
10. Measure the 3-4 clutch clearance.
Note: Make several measurements and calculate the average value.
1) Measure the clearance between the snap ring and the retaining plate.
3-4 clutch clearance:
1.3 - 1.6 mm (0.051 - 0.063 in)
2) If the clearance is not within specification, adjust it by selecting a proper snap ring from below.
Snap ring sizes
11. Install the SST as shown, and check clutch operation by applying compressed air.
Air pressure:
392 kPa (4.0 kgf/cm2, 57 psi) max.
12. Apply petroleum jelly to the thrust bearings and secure them to each side of the 3-4 clutch drum.
Thrust bearing outer diameter
Carrier hub side: 56.1 mm (2.21 in)
Output shell side: 72.1 mm (2.84 in)