LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> RX 350 AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> U151F Automatic Transaxle >> Automatic Transaxle Unit >> Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Automatic Transaxle Unit: Inspection

  1. INSPECT MULTIPLE DISC CLUTCH HUB 
    1. Using a dial indicator, measure the inside diameter of the forward clutch hub bushing.

      Standard inside diameter: 

      23.025 to 23.046 mm (0.9065 to 0.9073 in.) 

      Maximum inside diameter: 

      23.09 mm (0.9091 in.) 

      Fig 1: Measuring Inside Diameter Of Forward Clutch Hub Bushing
      G05841503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Check the contact surface of the bushing in the direct clutch shaft. If any scratch or discoloration is found, replace the direct clutch sub-assembly with a new one.

      If the inside diameter is greater than the maximum, replace the forward clutch hub with a new one.

  2. INSPECT NO. 2 UNDERDRIVE CLUTCH DISC 
    1. Check if the sliding surfaces of the disc, plate, and flange are worn or burnt. If necessary, replace them.
      NOTE:
      • 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.
        Fig 2: Identifying Sliding Surface Of Disc
        G04976203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT OVERDRIVE DIRECT CLUTCH DRUM SUB-ASSEMBLY 
    1. Using a dial indicator, measure the inside diameter of the forward clutch hub bushing.

      Standard inside diameter: 

      23.025 to 23.046 mm (0.9065 to 0.9073 in.) 

      Maximum inside diameter: 

      23.09 mm (0.9091 in.) 

      Fig 3: Measuring Inside Diameter Of Forward Clutch Hub Bushing
      G05000827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Check the contact surface of the bushing in the direct clutch shaft. If any scratch or discoloration is found, replace the direct clutch sub-assembly with a new one.

      If the inside diameter is greater than the maximum, replace the forward clutch hub with a new one.

  4. INSPECT 2ND BRAKE CLUTCH DISC 
    1. Check if the sliding surface of the disc, plate, and flange are worn or burnt. If necessary, replace them.
      NOTE:
      • 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.
        Fig 4: Identifying 2nd Brake Clutch Disc
        G04976205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT 1ST AND REVERSE BRAKE CLUTCH DISC 
    1. Check if the sliding surface of the disc, plate, and flange are worn or burnt. If necessary, replace them.
      NOTE:
      • 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.
        Fig 5: Identifying Reverse Brake Clutch Disc
        G04976206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT 1ST AND REVERSE BRAKE RETURN SPRING SUB-ASSEMBLY 
    1. Using vernier calipers, measure the free length of the spring together with the spring seat.

      Standard free length: 

      17.61 mm (0.6933 in.) 

      HINT:

      If the result is not as specified, replace the spring.

      Fig 6: Measuring Free Length Of Spring Together
      G05840827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT UNDERDRIVE BRAKE RETURN SPRING SUB-ASSEMBLY 
    1. Using vernier calipers, measure the free length of the spring together with the spring seat.

      Standard free length: 

      13.24 mm (0.5213 in.) 

      HINT:

      If the result is not as specified, replace the spring.

      Fig 7: Measuring Free Length Of Spring Together
      G05841509Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT PACK CLEARANCE OF 1ST AND REVERSE BRAKE 
    1. Using vernier calipers, measure the distance between the disc surface and the contact surface of the 2nd brake cylinder and transaxle case (Dimension A).
    2. Select an appropriate flange so that the pack clearance will be within the specified range.

      Pack clearance: 

      1.16 to 1.35 mm (0.0457 to 0.0531 in.) 

      Fig 8: Measuring Distance Between Disc Surface And Contact Surface Of 2nd Brake Cylinder
      G05000832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Piston stroke = Dimension A - Flange thickness

      Flange thickness: mm (in.) 

      FLANGE THICKNESS SPECIFICATION

      Mark Thickness Mark Thickness
      1 1.8 (0.071) 5 2.2 (0.087)
      2 1.9 (0.075) 6 2.3 (0.091)
      3 2.0 (0.079) 7 2.4 (0.094)
      4 2.1 (0.083) 8 2.5 (0.098)
    3. Install the flange.
  9. INSPECT PACK CLEARANCE OF 2ND BRAKE 
    1. Using vernier calipers, measure the distance between the disc surface and snap ring surface (Dimension B).
    2. Select an appropriate flange so that the pack clearance will be within the specified range.

      Pack clearance: 

      0.62 to 0.91 mm (0.0244 to 0.0358 in.) 

      Fig 9: Measuring Distance Between Disc Surface And Snap Ring Surface
      G05000833Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Piston stroke = Dimension B - Flange thickness - Snap ring thickness 1.6 mm (0.063 in.)

      Flange thickness: mm (in.) 

      FLANGE THICKNESS SPECIFICATION

      Mark Thickness Mark Thickness
      1 3.0 (0.118) 5 3.4 (0.134)
      2 3.1 (0.122) 6 3.5 (0.138)
      3 3.2 (0.126) 7 3.6 (0.142)
      4 3.3 (0.130) 8 -
  10. INSPECT PACK CLEARANCE OF UNDERDRIVE BRAKE 
    1. Using a dial indicator, measure the underdrive brake pack clearance while applying and releasing compressed air (392 kPa, 4.0 kgf/cm2 , 57 psi).

      Pack clearance: 

      1.81 to 2.20 mm (0.0713 to 0.0866 in.) 

      HINT:

      Select an appropriate flange from the table below so that it will be within the specified range.

      Fig 10: Measuring Underdrive Brake Pack Clearance
      G04976211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Flange thickness: mm (in.) 

      FLANGE THICKNESS SPECIFICATION

      Mark Thickness Mark Thickness
      1 3.0 (0.118) 4 3.1 (0.122)
      2 3.2 (0.126) 5 3.3 (0.130)
      3 3.4 (0.134) - -
    2. Temporarily remove the snap ring and attach it to the flange.
    3. Reinstall the snap ring.
  11. INSPECT UNDERDRIVE ONE-WAY CLUTCH ASSEMBLY 
    1. Install the underdrive clutch assembly to the one-way clutch.
    2. Rotate the underdrive one-way clutch assembly to check the rotating direction for the lock or free operation.

      HINT:

      If the result is not as specified, replace the underdrive one-way clutch.

      Fig 11: Checking Free Operation
      G04976212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSPECT INPUT SHAFT END PLAY 
    1. Using a dial indicator, measure the input shaft end play.

      End play: 

      0.262 to 1.244 mm (0.0103 to 0.0490 in.) 

      HINT:

      If the result is not as specified, replace the input shaft or thrust needle roller bearing.

      Fig 12: Measuring Input Shaft End Play
      G04976213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals