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Page Hits: 1965219
US BULLETIN No: K001/96 DATE: 1996
CAN BULLETIN No: N/A
APPLIES TO: 1989-1995 MPV AFFECTED VINs: All
SUBJECT: Transmission repair procedure torque converter material flaking
BULLETIN NOTES: Applicable to 1989-95 MPV with V-6 engines and ECAT transmissions and 1988-95 929 with ECAT transmissions
DETAILS:

The symptoms listed below may result from torque converter clutch (TCC) material flaking off inside the torque converter and flowing to the oil pan. Line pressure drops and the oil pump will cavitate when enough material is drawn against the oil pan filter.

Follow the diagnostic procedure listed in this bulletin when the symptoms (listed below) occur.

NOTE: Service Managers should place a copy of this bulletin at the beginning of section K in the workshop manual .

SYMPTOMS

  • Transmission will not move when hot.
  • Shudder during torque converter lock-up.
  • Slipping
  • Whining noise caused by pump cavitation.

DIAGNOSTIC PROCEDURE

  1. Remove the dip stick.
    • Inspect oil color - fluid should be brown.
    • Smell the fluid - normally, the oil will not smell burnt. The oil should smell like used oil from a good transmission.

    NOTE: If the oil has a powerful burnt smell, do not proceed, the transmission must be replaced.

  2. Check the line pressure. Refer to section K of the workshop manual for instructions.
    • Line pressure will be low.
    • Line pressure will be normal initially then drop as material is drawn to the filter.
  3. Remove the oil pan.
    • Large amounts of clutch material should be in the pan and on the filter.

    NOTE: If metallic particles are found, do not proceed, the transmission must be replaced.

REPAIR PROCEDURE

  1. Clean the oil pan and replace the filter.
  2. Replace the torque converter.
    NOTE: Check the torque converter mounting bolt length. The bolts must not exceed 10.3mm in length. Bolts that are too long will damage the TCC lock up surface by creating a high spot. This high spot will wear the clutch material immediately.
  3. Flush oil cooler and lines using Mazda recommended flushing equipment.
    NOTE: Using compressed air alone is not sufficient for cleaning the oil cooler.
  4. Recheck line pressure.
  5. Test drive vehicle.
    • Check specifically for slippage and shudder during TCC lock-up.
CONSUMER NOTICE:
The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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