Automatic Transmission Unit Inspection

Remove the magnets and use them to collect steel particles.

Carefully look at the foreign matter and particles in the pan and on the magnets to anticipate the type of wear you will find in the transmission.

1. Steel (magnetic): bearing, gear and clutch plate wear.
   
2. Brass (non-magnetic): bush wear.
   

Hold the overdrive direct clutch drum and turn the input shaft. Check that the input shaft can be turned clockwise freely and locks when turned counterclockwise.

Text in Illustration

	Lock
	Free

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

15.8 mm (0.622 in.)

Check that the check ball is free by shaking the piston.

Check that the valve does not have leaks by applying low-pressure compressed air.
If the result is not as specified, replace the overdrive direct clutch piston sub-assembly.

Using a dial indicator, measure the inside diameter of the clutch drum bushes.

Standard inside diameter:

27.037 to 27.063 mm (1.0645 to 1.0654 in.)

Using a dial indicator, measure the inside diameter of the planetary gear bush.

Standard inside diameter:

11.200 to 11.221 mm (0.4409 to 0.4417 in.)

Using a feeler gauge, measure the planetary pinion gear thrust clearance.

Standard clearance:

0.20 to 0.60 mm (0.00788 to 0.0236 in.)

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Place the overdrive support assembly onto the direct clutch assembly.

Apply compressed air (392 kPa (4.0 kgf/cm², 57 psi)) into the oil passage and check that the overdrive brake piston moves smoothly.

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

17.03 mm (0.671 in.)

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

21.32 mm (0.839 in.)

Check that the check ball is free by shaking the piston.

Check that the valve does not have leaks by applying low-pressure compressed air.

Using a dial indicator, measure the inside diameter of the clutch drum bush.

Standard inside diameter:

53.915 to 53.94 mm (2.1227 to 2.1236 in.)

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Check that the check ball is free by shaking the piston.

Check that the valve does not have leaks by applying low-pressure compressed air.

Using a dial indicator, measure the inside diameter of the input shaft bush.

Standard inside diameter:

24.000 to 24.026 mm (0.9449 to 0.9459 in.)

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

19.47 mm (0.767 in.)

Check the piston rod length.

HINT:

There are 2 different standard lengths for the piston rod.

Piston Rod Length:

Groove Mark	Length
Without	78.3 to 78.5 mm (3.083 to 3.090 in.)
With	79.8 to 80.0 mm (3.142 to 3.149 in.)

Using a dial indicator, measure the inside diameter of the planetary ring gear bush.

Standard inside diameter:

24.000 to 24.026 mm (0.9449 to 0.9459 in.)

Using a feeler gauge, measure the pinion gear thrust clearance.

Standard clearance:

0.20 to 0.60 mm (0.00788 to 0.0236 in.)

Hold the planetary sun gear and turn the 1-way clutch assembly. Check that the 1-way clutch hub can be turned clockwise freely and locks when turned counterclockwise.

Text in Illustration

	Lock
	Free

Using a dial indicator, measure the inside diameter of the planetary sun gear bushes.

Standard inside diameter:

27.000 to 27.026 mm (1.0630 to 1.0640 in.)

Check that the second brake piston moves smoothly when applying compressed air to and releasing low-pressure compressed air from the second brake drum.

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

16.05 mm (0.632 in.)

Replace all the discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt, 2) the lining of a disc is peeled off or discolored, or 3) the grooves or printed numbers have even a little bit of damage.

NOTICE:

When assembling new discs, soak them in ATF for at least 15 minutes.

Hold the planetary gear and turn the 1-way clutch inner race. Check that the 1-way clutch inner race can be turned counterclockwise freely and locks when turned clockwise.

Text in Illustration

	Lock
	Free

Using a feeler gauge, measure the thrust clearance.

Standard clearance:

0.20 to 0.60 mm (0.00788 to 0.0236 in.)

Using a vernier caliper, measure the free length of the spring together with the spring seat.

Standard free length:

12.902 mm (0.508 in.)

Using a cylinder gauge, measure the inside diameter of the transmission case rear bush.

Standard inside diameter:

38.113 to 38.138 mm (1.50051 to 1.50149 in.)

Make sure the first and reverse brake pistons move smoothly when compressed air is applied into the transmission case.

Place a mark on the second coast brake piston rod.

Using SST, measure the stroke while applying and releasing compressed air (392 kPa (4.0 kgf/cm², 57 psi)).

SST

09240-00020

Standard piston stroke:

1.5 to 3.0 mm (0.0591 to 0.118 in.)

Using a dial indicator, measure the end play of the output shaft while moving it by hand.

Standard end play:

0.30 to 1.04 mm (0.0119 to 0.0409 in.)

Check that the output shaft rotates smoothly.