Leak Diagnosis Procedure

LEAK DIAGNOSIS PROCEDURE

1. Check the fluid level and condition. If the fluid level is high or low, adjust to the proper level.

2. Raise and support the vehicle.

3. Inspect the transmission and correct any external leaks from the oil pan gasket, filler tube, governor line to TCS switch if equipped, cooler line fittings, pressure test port plugs and case- to-adapter housing gasket.

4. Remove the converter housing spacer plate. Wipe all fluid from the converter housing area.

5. Operate the engine at 2000 rpm for 2 minutes and observe the converter housing for the fluid accumulation pattern. If the fluid accumulation pattern is not evident, proceed to the next step.

6. If a circular pattern develops, it indicates a defective or damaged torque converter. Correct the leak by replacing the converter.

7. If a trickle develops, it indicates an oil pump leak caused by one or more of the following conditions:


- Pump drainback hole obstructed.

- Pump housing vent obstructed.

- Pump bushing or converter hub scored, nicked, pitted or burred.

- Defective oil pump 0-ring, gasket or seal.

- Front band lever pin plug loose or plug threads in case are stripped.

8. Correct these conditions as outlined in the following steps:

- Remove the transmission and converter.

- Tighten the front band adjusting screw until the band is tight around the front clutch retainer; this will prevent the front clutch assembly from also coming out when the oil pump is removed and prevent damaging the clutch discs.

- Remove the oil pump and oil seal.

- Inspect the pump housing drainback and vent holes for obstructions. If the drainback hole cannot be opened using thin wire, replace the pump housing. Check the vent hole by blowing solvent through the vent. If the vent cannot be opened, replace the pump housing.

- Inspect the condition of the pump housing and converter hub. If the bushing is scored, replace it and polish the hub using fine sandpaper.

- Install the replacement oil pump seal, 0-ring, gasket and oil pump.

- Loosen the kickdown lever pin plug two turns.

- Apply a small quantity of No.2 Permatex, or equivalent sealer, to plug threads and tighten the plug to 17 Nm (150 in-lbs) torque.

- Adjust the front band.

9. Install the transmission and converter.

10. Install the converter housing spacer plate.

11. Remove the supports and lower the vehicle.