LEAKAGE INSPECTION [5R55S]

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Leak Check Test with a Black Light

Note
•  Automatic Transmission/Power Steering Dye (specifically formulated for ATF) is used to detect a transmission fluid leak.

1.  Add Automatic Transmission/Power Steering Dye to the transmission fluid. Use one 30.0 mL {30.0 cc, 1 ft oz}of dye solution for every 3.8 L {4.0 US qt, 3.3 lmp qt} of transmission fluid.

2.  Start and run the engine until the transmission reaches its normal operating temperature.

3.  Observe the back of the cylinder block and top of the torque converter housing for evidence of fluid leakage.

4.  Raise the vehicle on a hoist.

5.  Run the engine at fast idle, then at engine idle, occasionally shifting to the D range and R position to increase pressure within the transmission.

6.  Observe the front of the flexplate, back of the cylinder block (in as far as possible), inside the torque converter housing and the entire case until fluid leakage is evident and the probable source of leakage can be detemined.

Caution
•  Do not try to stop a fluid leak by increasing the torque beyond specifications. This may cause damage to the transmission case threads.

External fluid leaks

Leak path

Possible source
Leaks at the fluid pan-to-case
•  Pan bolts not tightened to specification.
•  Case pan rail damaged.
•  Pan gasket damaged.
Fluid cooler lines or fittings leaking
•  Cooler line(s), cooler line fitting(s) damaged.
•  Cooler line fittings-to-case union damaged.
•  Case damage at case fitting.
•  Fittings not tightened to specifications.
Fluid cooler line nut-to-case fittings leaking
•  Damaged or missing O-rings.
•  Fittings not tightened to specifications.
Leaks at the fluid cooler
•  Fluid cooler damage.
•  Fitting(s) damaged or not tightened to specifications.
Leaks at the external sensors
•  Damaged or missing O-rings.
•  Screw not tightened to specifications.
Leaks at the manual control lever seal
•  Damaged or missing lever seal.
Leaks at the solenoid body harness connector
•  Install a new solenoid body wiring harness connector O-ring seal. Either on the wiring harness end or the solenoid body.
Fluid leakage in the torque converter area
•  For possible sources refer to Fluid Leakage In Torque Converter Area Chart.


Fluid Leakage in Torque Converter Area

•  In diagnosing and correcting fluid leaks in the front pump support and gear and torque converter area, use the following procedures to locate the exact cause of the leakage.
•  Leakage at the front of the transmission, as evidenced by fluid around the torque converter housing, may have several sources.
•  By careful observation it is possible, in many instances, to pinpoint the source of leak before removing the transmission from the vehicle.
•  The paths which the fluid takes to reach the bottom of the torque converter housing are shown in the illustration.
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Leak path

Symptom

Possible source
1, 2 and 4
Leak at front of transmission
Pump lip seal
1, 2 and 4
Leak at front of transmission
Converter hub weld
1, 2 and 4
Leak at front of transmission
External pump seal (large)
1, 2 and 4
Leak at front of transmission
Pump-to-case screws
1, 2 and 4
Leak at front of transmission
Pump gasket
3
Leak at front of transmission
Torque converter seal weld
3
Leak at front of transmission
Torque converter stud
5
Leak at front of transmission
Engine oil leak—rear main seal
5
Leak at front of transmission
Engine valve cover
5
Leak at front of transmission
Oil galley
5
Leak at front of transmission
Engine oil pressure sensor
6
Leak between engine and transmission case
Venting