What Causes Oil Leakage in the Torque Converter?
2 Answers
The cause of oil leakage in the torque converter may be due to assembly process issues or deformation of a certain component. Function of the Torque Converter: The torque converter serves to transmit torque, change torque, shift gears, and act as a clutch. It is typically installed between the engine power unit and the transmission, with ATF (Automatic Transmission Fluid) hydraulic pressure acting as the working medium. It helps transfer engine power to the gears, thereby reducing the impact force experienced during gear shifts. This is very similar to the semi-engaged state of a manual transmission clutch. Moreover, when the rotational speed reaches a certain level, the torque converter automatically locks. Introduction to the Torque Converter: The torque converter, also known as the hydraulic torque converter, is a component in automatic transmissions designed to assist the engine flywheel in transmitting power. It directly replaces the traditional clutch in manual transmissions and consists of three hydraulic elements: the impeller (pump), turbine, and stator. As a non-rigid torque converter that operates using fluid as the medium, it transmits power in liquid form. It includes a sealed working chamber where the fluid circulates continuously. The impeller, turbine, and stator are each connected to the input shaft, output shaft, and housing, respectively, to perform their functions.
I suspect the transmission booster is leaking oil, and there are several common causes. The primary reason is aging rubber seals—over time, rubber hardens and cracks, allowing oil to seep through gaps. Another issue is faulty oil seals; improper installation or low-quality materials increase the risk of leaks. I’ve experienced this myself—frequent stop-and-go driving in city traffic raises oil pressure, accelerating component fatigue. Additionally, damaged dust covers are common, allowing dirt and moisture to corrode seals. I recommend checking the undercarriage monthly for oil stains—don’t wait until the transmission overheats and fails, as repairs will cost much more. Regular oil changes and maintenance can prevent this, and it’s best to use genuine parts at authorized shops.
