3-4 Clutch

SST:

Preparation

Preinspection




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

Air pressure: 392 kPa 4.0 kg/sq.cm, 57 psi max.




Clutch clearance
1. Measure the clearance between the snap ring and the retaining plate of the 3-4 clutch.
2. If the clearance is not within specification, adjust it by selecting a proper snap ring.

3-4 clutch clearance: 1.3 - 1.6 mm {0.051 - 0.063 in}




Disassembly / Inspection / Assembly
1. Disassemble in the order shown in the figure, referring to Disassembly Note.
2. Inspect all parts and repair or replace as necessary.
3. Assemble in the reverse order of disassembly, referring to Assembly Procedure.




Disassembly note

Snap ring
1. Install the SST to the 3-4 clutch as shown.
2. Compress the spring and retainer assembly.
3. Remove the snap ring.
4. Remove the SST, then remove the spring and retainer.




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

Inspection




Drive plates
1. Measure the facing thickness in three places, and determine the average of the three readings.

Standard: 1.6 mm {0.063 in}
Minimum: 1.4 mm {0.055 in}

2. If not within specification, replace the drive plate(s).

Specifications:

Return spring
1. Measure the spring free length.
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 kg/sq.cm, 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.




2. Install the spring and retainer.




3. Install the SST to the 3-4 clutch as shown.
4. Compress the spring and retainer.
5. Install the snap ring.
6. Remove the SST.






NOTE:
- Installation order: Driven-Drive-Driven-Drive-Driven-Drive-Driven-Drive

7. Install the drive and driven plates.
8. Install the retaining plate.
9. Install the snap ring.

Snap Ring Sizes:

10. Measure the 3-4 clutch clearance.
1. Measure the clearance between the snap ring and the retaining plate of the 3-4 clutch.
2. If the clearance is not within specification, adjust it by selecting a proper snap ring.

3-4 clutch clearance: 1.3 - 1.6 mm {0.051 - 0.063 in}




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

Air pressure: 392 kPa {4.0 kg/sq.cm, 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}