Leakage Inspection

4R70E/4R75E

Leakage Inspection

External Fluid Leaks:

External Sealing

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

The transmission has the following parts to prevent external fluid leakage:

- Gaskets
- Lip-type seals
- O-ring seals
- Seal rings
- Seal grommets
- Seal washers
- Thread sealant

External Sealing










Fluid Leakage in Torque Converter Area

Transmission fluid leakage at the front of the transmission, as evidenced by transmission fluid around the torque converter housing part of the case, may have several sources. By careful observation, it is possible in many instances to pinpoint the source of the leak before removing the transmission from the vehicle.

The paths which the transmission fluid takes to reach the bottom of the torque converter housing part of the case are shown in the illustration. The 5 numbers in the illustration correspond with the 5 flow path steps.











Leak Check Test With A Black Light

WARNING: If equipped with fire suppression system, refer to Fire Suppression System for Important Safety Warnings. Failure to follow this instruction may result in serious personal injury Procedures.

Dye-Lite(R) ATF/Power Steering Fluid Leak Detection Dye 164-R3701 (specifically formulated for ATF) is used to detect a transmission fluid leak.

1. Add dye to the transmission fluid. Use one 30.0 mL (1 oz) of dye solution for every 3.8L (4 qt) of transmission fluid.

2. Start and run the engine until the transmission/transaxle reaches its normal operating temperature. Observe the back of the cylinder block and top of the torque converter housing for evidence of transmission fluid leakage. Raise the vehicle on a hoist and run the engine at fast idle, then at engine idle, occasionally shifting to the DRIVE and REVERSE positions to increase pressure within the transmission/transaxle. 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 transmission fluid leakage is evident and the probable source of leakage can be determined.