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Home >> Pontiac >> 2006 >> Vibe Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Automatic Transmission - Mu4 - Overhaul) >> Repair Instructions >> Underdrive Clutch Assembly Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Checking Underdrive One-Way Clutch Rotation
    GM165171Courtesy of GENERAL MOTORS CORP.
  1. Inspect the underdrive one-way clutch before disassembly by placing the underdrive one-way clutch onto the rear of the underdrive clutch drum, holding the underdrive clutch drum stationary and rotating the underdrive one-way clutch.
  2. The underdrive one-way clutch should turn freely in a counterclockwise direction (2) and should not turn in a clockwise direction (3). If the underdrive one-way clutch is installed correctly on the underdrive clutch drum and the underdrive one-way clutch can be turned clockwise, replace the underdrive one-way clutch.
    3. Fig 2: View Of J 7872
    GM165175Courtesy of GENERAL MOTORS CORP.
  3. Use a J 7872  to measure the underdrive clutch (1) piston stroke before disassembly. See Special Tools .
    • Temporarily install the old underdrive clutch drum support seal rings on the underdrive clutch drum support in the transaxle case.
    • Place the underdrive clutch drum on the underdrive clutch drum support in the transaxle case and the J 7872  plunger on the underdrive clutch piston. See Special Tools .
    4. Fig 3: Checking Underdrive Clutch Piston Stroke By Blowing Air Into Passage
    GM165178Courtesy of GENERAL MOTORS CORP.
  4. Apply 392-785 kPa (57-114 psi) of compressed air into the underdrive clutch apply passage (1) in the transaxle case and observe the J 7872  . See Special Tools .
    • The standard underdrive clutch piston stroke should fall within 1.500-1.900 mm (0.0590-0.0748 in).
    • If the underdrive clutch piston stroke is greater or less than specified, inspect all underdrive clutch components for excessive wear.
    5. Fig 4: Removing Rear Thrust Plate From Underdrive One-Way Outer Race
    GM165181Courtesy of GENERAL MOTORS CORP.
    CAUTION: Wear safety glasses in order to avoid eye damage.
    NOTE: The underdrive one-way clutch should be disassembled for inspection purposes only. If excessive wear or damage is found in any component of the underdrive one-way clutch upon inspection, replace the underdrive one-way clutch as an assembly.
  5. Remove the rear thrust plate (2) from the underdrive one-way clutch outer race (1).
    6. Fig 5: View Of Underdrive One-Way Clutch Retainers & Sprag Assembly
    GM165183Courtesy of GENERAL MOTORS CORP.
  6. Remove the underdrive one-way clutch retainers (2, 4) and the sprag assembly (3) from the underdrive one-way clutch outer race.
    7. Fig 6: Removing Underdrive Clutch Snap Ring From Underdrive Clutch Drum
    GM165185Courtesy of GENERAL MOTORS CORP.
  7. Remove the underdrive clutch snap ring (2) from the underdrive clutch drum (1).
    8. Fig 7: Locating Underdrive Clutch Flange, Discs & Plates
    GM165186Courtesy of GENERAL MOTORS CORP.
  8. Remove the following components from the underdrive clutch drum (1):
    • The underdrive clutch flange
    • The 4 discs
    • The 4 plates
    9. Fig 8: Installing & Removing Underdrive Clutch Piston Return Spring Snap Ring With J 23327 & J 37279
    GM415848Courtesy of GENERAL MOTORS CORP.
  9. Use a J 23327  with a J 37279  to remove the underdrive clutch piston return spring snap ring (1) from the underdrive piston return spring (2). See Special Tools .
    10. Fig 9: Underdrive Clutch Piston Return Spring & Plate
    GM165190Courtesy of GENERAL MOTORS CORP.
  10. Remove the following components from the underdrive clutch piston:
    • The underdrive clutch piston return spring (1)
    • The underdrive clutch piston return spring plate (2)
    11. Fig 10: Checking Underdrive Clutch Piston Stroke By Blowing Air Into Passage
    GM165178Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When using compressed air to remove components, air pressure should not exceed 98 kPa (14 psi).
  11. Remove the underdrive clutch piston from the underdrive clutch drum by placing the underdrive clutch drum on the underdrive clutch drum support in the transaxle case and applying low pressure compressed air into the underdrive clutch apply passage (1) in the transaxle case (2).
  12. Remove the underdrive clutch drum from the underdrive clutch drum support in the transaxle case.
  13. Inspect the following components for excessive wear or damage and replace the underdrive one-way clutch assembly as necessary:
    • The underdrive one-way clutch sprag assembly
    • The underdrive one-way clutch outer race
  14. Inspect the underdrive clutch discs for excessive wear or damage and replace as necessary.
  15. Inspect the underdrive clutch piston for cracks or porosity and replace as necessary.
  16. Inspect the underdrive clutch piston check ball operation by applying compressed air into the working and release sides of the underdrive clutch piston.
  17. There must be no air leakage on the working side and air must pass freely through the release side. If these conditions do not exist, replace the underdrive clutch piston.
  18. Inspect the underdrive clutch piston return spring for distortion or weakness and replace as necessary.
    19. Fig 11: Measuring Diameter Of Front And Rear Underdrive Clutch Flange Bushings
    GM165192Courtesy of GENERAL MOTORS CORP.
  19. Use a J 26900-6  to measure the inside diameter of the front and rear underdrive clutch flange (3) bushings. See Special Tools .
    • The standard underdrive clutch flange bushing diameter should measure within the following parameters:
      • Front (1) 46.500-46.525 mm (1.8307-1.8316 in).
      • Rear (2) 55.000-55.030 mm (2.1653-2.1665 in).
    • The maximum inside diameter of the underdrive clutch bushing should measure within the following parameters:
      • Front 46.570 mm (1.8334 in)
      • Rear 55.080 mm (2.1685 in)

        If the inside diameter of the underdrive clutch bushings are greater than specified, replace the underdrive clutch drum.

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