2004 Toyota Sienna - Transmission Oil Pump Seal

Repairing a Front Pump Seal Transmission Leak

The front pump seal, also known as the torque converter seal or front seal, is a gasket installed between the torque converter shaft and the transmission case. The torque converter is a fluid coupling component that connects the engine to the transmission and drives the transmission fluid pump, and the transmission's front pump seal prevents the transmission fluid from leaking out of the transmission around the torque converter. Transmission fluid is essential for lubricating, cooling, and providing the hydraulic pressure necessary for the transmission to operate smoothly and without damage. If the front pump seal is damaged or becomes worn due to high engine and transmission temperatures or age, it can lead to transmission fluid leaks. Transmission fluid leaks can result in a variety of problems, including reduced lubrication or internal pressure, overheating, and potential damage to transmission components. If you notice the transmission slipping or shifting hard, then the transmission might have a low fluid level and low fluid pressure. Fluid around the front of the transmission bellhousing or puddles under the vehicle can indicate a failing seal, and if the leaking fluid comes in contact with hot engine components, there could also be a burning smell. Failing to address a failing front pump seal or a transmission fluid leak can cause an underperforming transmission, delayed or hard shifting, and potential transmission damage. For your next transmission repair, shop O'Reilly Auto Parts for a replacement automatic transmission front pump seal, tailshaft seal, transmission fluid, and more to keep your transmission working its best.