Toyota Sienna Service Manual: Inspection

1. INSPECT UNDERDRIVE PACK CLEARANCE

(a) Install the underdrive clutch to the transaxle case.

NOTICE: Be careful not to damage the oil seal rings.

(b) Install a dial indicator as shown in the illustration.

(c) Measure the underdrive clutch pack clearance while applying and releasing compressed air (392 kPa, 4.0 kgf/cm2, 57 psi).

Pack clearance: 1.51 to 1.71 mm (0.0594 to 0.0673 in.)

If the pack clearance is not as specified, inspect the discs, plates and flange.

HINT: There are 5 flanges in different thickness.

Flange thickness: mm (in.)

2. INSPECT UNDERDRIVE CLUTCH DISC NO.1

(a) Check if the sliding surface of the disc, plate and flange are worn or burnt. If necessary, replace them.

HINT:

• If the lining of the disc comes off or discolors, or if a part of the groove is worn, replace all discs.
• Before installing new discs, immerse them in ATF for at least 15 minutes.

3. INSPECT UNDERDRIVE CLUTCH DRUM SUBASSEMBLY

(a) Using a dial indicator, measure the inside diameter of the underdrive clutch drum bushing.

Standard drum bushing: 37.06 to 37.08 mm (1.4591 to 1.4598 in.) Maximum drum bushing: 37.13 mm (1.4618 in.)

If the inside diameter is greater than the maximum, replace the underdrive clutch drum.

4. INSPECT UNDERDRIVE CLUTCH RETURN SPRING SUB-ASSEMBLY

(a) Using a vernier calipers, measure the free length of the spring together with the spring seat.

Standard free length: 17.14 mm (0.6752 in.)