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Home >> Lexus >> 2010 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Component Tests and General Diagnostics >> Clutch Drum and Input Shaft Assembly

Clutch Drum and Input Shaft Assembly





A761E AUTOMATIC TRANSMISSION: CLUTCH DRUM AND INPUT SHAFT ASSEMBLY: INSPECTION

1. INSPECT UNDERDRIVE 1-WAY CLUTCH ASSEMBLY

(a) Hold the coast clutch hub and turn the 1-way clutch.





(b) Check that the 1-way clutch turns freely counterclockwise and locks clockwise.

If there is a problem with the 1-way clutch, replace it.

2. INSPECT DIRECT CLUTCH RETURN SPRING SUB-ASSEMBLY

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





Standard free length:

19.51 mm (0.768 in.)

(a) If the free length is not as specified, replace the clutch return spring sub-assembly.

3. INSPECT REVERSE CLUTCH RETURN SPRING SUB-ASSEMBLY

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





Standard free length:

21.04 mm (0.828 in.)

(a) If the free length is not as specified, replace the clutch return spring sub-assembly.

4. INSPECT DIRECT CLUTCH DISC

(a) Replace all 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) grooves or printed numbers have even a little bit of damage.





NOTICE:
Before assembling new discs, soak them in ATF for at least 15 minutes.

5. INSPECT PACK CLEARANCE OF DIRECT CLUTCH

(a) Inspect the pack clearance of the direct clutch.





(1) Using a dial indicator, measure the moving distance (distance A) of the clutch flange at both ends across the diameter while blowing air into the oil hole as shown in the illustration, and calculate the average.

HINT
Flange moving distance A = 0.26 to 1.14 mm (0.010 to 0.045 in.)

Pack clearance = Flange moving distance A - 0.05 mm (0.002 in.)

Standard pack clearance:

0.5 to 0.8 mm (0.020 to 0.031 in.)

NOTICE:
When measuring the moving distance, install a standard flange (thickness: 3.4 mm, 0.134 in.) to the position of the shaded area shown in the illustration.

(2) If the pack clearance is not as specified, select and install a clutch flange that brings the pack clearance within the standard.

HINT
There are 9 types of flanges that can be used to adjust the pack clearance. Select the one with the most appropriate thickness.

Flange thickness:





6. INSPECT PACK CLEARANCE OF REVERSE CLUTCH

(a) Inspect the pack clearance of the reverse clutch hub.

(1) Using a dial indicator, measure the reverse clutch piston stroke (distance A) and moving distance (distance B) of the reverse clutch flange at both ends across the diameter while blowing air (392 kPa, 4 kgf/cm2, 57 psi) into the oil hole as shown in the illustration, and calculate the average.





HINT
Piston stroke A = 1.05 to 2.15 mm (0.041 to 0.085 in.)

Flange moving distance B = 0.72 to 1.08 mm (0.028 to 0.043 in.)

Pack clearance = Piston stroke A - Flange moving distance B - 0.06 mm (0.002 in.)

Standard pack clearance:

0.5 to 0.8 mm (0.020 to 0.031 in.)

NOTICE:
When measuring the moving distance, install a standard flange (thickness: 3.3 mm, 0.130 in.) to the position of the shaded area shown in the illustration.

(2) If the pack clearance is outside the standard, select and install a clutch flange that brings the pack clearance within the standard.

HINT
There are 11 types of flanges that can be used to adjust the pack clearance. Select the one with the most appropriate thickness.

Standard flange thickness:





7. INSPECT FORWARD CLUTCH RETURN SPRING SUB-ASSEMBLY

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





Standard free length:

24.64 mm (0.9701 in.)

(a) If the free length is not as specified, replace the clutch return spring sub-assembly.

8. INSPECT COAST CLUTCH DISC

(a) Replace all 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) grooves or printed numbers have even a little bit of damage.





NOTICE:
Before assembling new discs, soak them in ATF for at least 15 minutes.

9. INSPECT PACK CLEARANCE OF COAST CLUTCH

(a) Inspect the pack clearance of the coast clutch hub.





(1) Using a dial indicator, measure the moving distance (distance A) of the clutch flange at both ends across the diameter while blowing air into the oil hole as shown in the illustration, and calculate the average.

HINT
Flange moving distance A = 0.38 to 1.48 mm (0.01496 to 0.0583 in.)

Pack clearance = Flange moving distance A - 0.02 mm (0.0008 in.)

Standard pack clearance:

0.3 to 0.6 mm (0.012 to 0.024 in.)

NOTICE:
When measuring the moving distance, install a standard flange (thickness: 3.0 mm, 0.018 in.) to the position of the shaded area shown in the illustration.

(2) If the pack clearance is not as specified, select and install a clutch flange that brings the pack clearance within the standard.

HINT
There are 10 types of flanges that can be used to adjust the pack clearance. Select the one with the most appropriate thickness.

Standard flange thickness:





10. INSPECT FORWARD CLUTCH HUB CLUTCH DISC

(a) Replace all 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) grooves or printed numbers have even a little bit of damage.





NOTICE:
Before assembling new discs, soak them in ATF for at least 15 minutes.

11. INSPECT PACK CLEARANCE OF FORWARD CLUTCH

(a) Inspect the pack clearance of the forward clutch.

(1) Using a dial indicator, measure the moving distance (distance A) of the clutch flange at both ends across the diameter while blowing air into the oil hole as shown in the illustration, and calculate the average.





HINT
Flange moving distance A = 0.36 to 1.50 mm (0.142 to 0.0591 in.)

Pack clearance = Flange moving distance A - 0.11 mm (0.0043 in.)

Standard pack clearance:

0.56 to 0.86 mm (0.0220 to 0.0339 in.)

NOTICE:
When measuring the moving distance, install a standard flange (thickness: 3.4 mm, 0.134 in.) to the position of the shaded area shown in the illustration.

(2) If the pack clearance is not as specified, select and install a clutch flange that brings the pack clearance within the standard.

HINT
There are 11 types of flanges that can be used to adjust the pack clearance. Select the one with the most appropriate thickness.

Standard flange thickness:





12. INSPECT FORWARD CLUTCH HUB SUB-ASSEMBLY

(a) Using a caliper gauge, measure the inside diameter of the forward clutch hub bush.





Standard inside diameter:

26.037 to 26.062 mm (1.0251 to 1.0261 in.)

(a) If the inside diameter is not as specified, replace the forward clutch hub sub-assembly.

13. INSPECT REAR CLUTCH DISC

(a) Replace all 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) grooves or printed numbers have even a little bit of damage.





NOTICE:
Before assembling new discs, soak them in ATF for at least 15 minutes.

14. INSPECT REVERSE CLUTCH HUB SUB-ASSEMBLY

(a) Using a caliper gauge, measure the inside diameter of the reverse clutch hub bush.





Standard inside diameter:

35.812 to 35.837 mm (1.4099 to 1.4109 in.)

(a) If the inside diameter is not as specified, replace the reverse clutch hub sub-assembly.
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