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Torque Converter Clutch And Drive Plate: Inspection: Inspection

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  1. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY 
    1. Inspect the one-way clutch.
      Fig 1: Inspecting Torque Converter Clutch Assembly
      GTY294890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Press on the spline of the stator with a finger and rotate it. Check that it rotates smoothly when turned clockwise and rotates with difficulty when turned counterclockwise.
        TEXT IN ILLUSTRATION

        *a Free
        *b Lock
        *c Spline

        If necessary, clean the converter and recheck the one-way clutch.

        Replace the torque converter if the one-way clutch still fails the inspection.

    2. Determine the condition of the torque converter.
      Fig 2: Identifying Powder In ATF
      GTY253218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. If the inspection result of the torque converter satisfies the following conditions, replace the torque converter.

        Malfunction 

        • A metallic sound is emitted from the torque converter during the stall test or when the shift lever is moved to N.
        • The one-way clutch is free or locked in both directions.
        • The amount of powder in the ATF is greater than the sample shown in the illustration above.
          TEXT IN ILLUSTRATION

          *a Sample showing maximum allowable amount of powder in ATF

          HINT: 

          The sample shows approximately 0.025 liters (0.026 US qts, 0.022 Imp. qts) of ATF that is taken out from the removed torque converter.

    3. Replace the ATF in the torque converter.
      1. If the ATF is discolored and/or has foul odor, stir the ATF in the torque converter and drain it.
    4. Clean and check the oil cooler and oil pipe line.
      Fig 3: Checking Oil Cooler And Oil Pipe Line
      GTY140872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. If the torque converter is inspected or the ATF is replaced, clean the oil cooler and oil pipe line.

        HINT: 

        • Apply compressed air of 196 kPa (2.0 kgf/ cm2 , 28 psi) into the inlet hose.
        • If a large amount of powder is found in the ATF, add new ATF using a bucket pump and clean the oil cooler and oil pipe line again.
      2. If the ATF is cloudy, inspect the oil cooler (radiator).
    5. Prevent deformation of the torque converter and damage to the oil pump gear.
      Fig 4: Identifying Torque Converter Bolts
      GTY295902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. When there is any damage due to the end of the bolt for the torque converter and to the bottom of the bolt hole, replace the bolt and the torque converter.
        TEXT IN ILLUSTRATION

        *a Correct
        *b Incorrect
        *c The bottom is damaged.
      2. All of the bolts should be the same length.
      3. Bolts with washers must be used.
  2. INSPECT DRIVE PLATE AND RING GEAR SUB-ASSEMBLY 
    1. Check the drive plate and ring gear for damage.
      Fig 5: Inspecting Drive Plate & Ring Gear Sub-Assembly Using A Dial Indicator
      GTY299838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Set up a dial indicator and measure the runout of the 6 portions around the torque converter contact surfaces.
      TEXT IN ILLUSTRATION

      Measurement Point

      Maximum runout

      0.30 mm (0.0118 in.)

      1. If the runout is not within the specification or the drive plate and ring gear is damaged, replace the drive plate and ring gear.
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