Leakage Inspection
Special Tool(s)
| Leak Tester, Torque Converter 307-421 |
Leak Check Test
- 1.
With the vehicle in NEUTRAL, position the vehicle on a hoist. Refer to: Jacking and Lifting - Overview .
- 7.
Add leak detection dye to the transmission fluid. Use 1 fl oz (30 ml) of dye solution for every 4 qt (3.8 L) of transmission fluid.
- 8.
With the transmission fluid at normal operating temperature, road test the vehicle for at least 1 mile with at least 1 application of the TCC.
- 9.
With the vehicle in NEUTRAL, position the vehicle on a hoist. Refer to: Jacking and Lifting - Overview .
Leakage From Torque Converter Housing
- 12.
Leaks from the torque converter housing can originate from several locations. The paths which the transmission fluid takes to reach the bottom of the torque converter housing is shown in the illustration. The following 6 steps correspond with the numbers in the illustration.- 1.
Transmission fluid leaking by the converter hub seal lip will tend to move along the drive hub and onto the back of the torque converter. Except in the case of a total seal failure, transmission fluid leakage by the lip of the seal will be deposited on the inside of the torque converter housing only, near the outside diameter of the housing.
- 2.
Transmission fluid leakage by the outside diameter of the torque converter impeller hub seal and the case will follow the same path that leaks by the inside diameter of the converter hub seal follow.
- 3.
Transmission fluid leakage from the converter cover weld or the converter-to-flexplate stud weld will appear at outside diameter of torque converter on the back face of the flexplate and in the converter housing only near the flexplate. If a converter-to-flexplate lug, lug weld or converter cover weld leak is suspected, remove the converter and pressure check.
- 4.
Transmission fluid leakage from the bolts inside the converter housing will flow down the back of the torque converter housing. Leakage may be from loose or missing bolts.
- 5.
Engine oil leaks from the rear main oil.
- 6.
Transmission fluid leak from pump to case seal.
- 1.
- 14.
Using a black light, observe the torque converter housing. Inspect for evidence of dye from the pump bolts, pump seal, and torque converter hub seal. Repair as required.
- 15.
If the source of the leak is not evident, continue with this procedure to leak test the torque converter.
- 18.
Secure the press. Apply enough force from the press to seal the torque converter leak tester (307-421) into the torque converter hub.
- 20.
Inspect for leaks at the torque converter hub weld and seams with air pressure applied to the valve. A soap bubble solution can be applied around those areas to aid in the diagnosis. If any leaks are present, install a new torque converter.
- 21.
Inspect for leaks at the stud or mounting pad and balance weight welds. A soap bubble solution can be applied around those areas to aid in the diagnosis. If any leaks are present, install a new torque converter.