GM Service Manual Online
For 1990-2009 cars only

Composition Plates

Dry and inspect the plates for the following conditions :

    • Pitting
    • Flaking
    • Wear
    • Glazing
    • Cracking
    • Charring
    • Chips or metal particles embedded in the lining

Replace the composition plate which shows any of these conditions.

Steel Plates

Wipe the plates dry and check the plates for heat discoloration. If the surfaces are smooth, even if colorsmear is indicated, you can reuse the plate. If the plate is discolored with hot spots or if the surface is scuffed, replace the plate.

Causes of Burned Clutch Plates

Important: If the clutch shows evidence or extreme heat or burning, replace the springs.

The following conditions can result in a burned clutch plate:

    • Incorrect usage of clutch plates
    • Engine coolant in the transaxle fluid
    • A cracked clutch piston
    • Damaged or missing seals
    • Low line pressure
    • Valve problems
       - The valve body face is not flat
       - Porosity between channels
       - The valve bushing clips are improperly installed.
       - The check balls are misplaced.
    • The seal rings are worn or damaged.

Engine Coolant in Transaxle

Notice: The antifreeze will deteriorate the Viton O-ring seals and the glue that bonds the clutch material to the pressure plate. Both conditions may cause damage to the transmission.

Perform the following steps if the transaxle oil cooler has developed a leak, allowing engine coolant to enter the transaxle:

  1. Because the coolant will attach to the seal material causing leakage, disassemble the transaxle and replace all rubber type seals.
  2. Because the facing material may become separated from the steel center portion, replace the composition faced clutch plate assemblies.
  3. Replace all nylon parts including washers.
  4. Replace the torque converter.
  5. Thoroughly clean and rebuild the transaxle, using new gaskets and oil filter.
  6. Flush the cooler lines after you have properly repaired or replaced the transaxle.