National 710714 Manual Transmission Shift Shaft Seal

Manual Transmission Shift Shaft Seal for BMW and Mercedes-Benz

National 710714 is a metric manual transmission shift shaft seal built with nitrile sealing material for dependable sealing at the transmission shaft. With a 15.000 mm inside diameter, 21.200 mm outside diameter, and 5.000 mm width, this oil seal is sized for specific manual transmission applications across BMW, Mercedes-Benz, Volvo, Cadillac, and Aston Martin vehicles.

Use National 710714 when you need a direct-fit manual transmission shift shaft seal for service work on BMW M3, BMW Z4, Mercedes-Benz SLK models, and other listed applications. The part number 710714 is also referenced in OE and aftermarket interchange listings for the same application.

Key Features

• Manual transmission shift shaft seal for transmission sealing service
• Nitrile sealing material for oil resistance in transmission applications
• Metric dimensions: 15.000 mm shaft ID, 21.200 mm OD, 5.000 mm width
• Housing bore diameter: 21.000 mm
• Overall width with side lip: 7.000 mm
• National oil seal from a brand with more than 75 years of sealing experience
• Part number: 710714

Detailed Description

National 710714 is a manual transmission shift shaft seal engineered as an oil seal for the transmission case area where the shift shaft passes through the housing. Its nitrile construction supports sealing performance in demanding drivetrain environments, while the metric dimensions help ensure proper fitment on the specified BMW, Mercedes-Benz, Volvo, Cadillac CTS, and Aston Martin DB7 applications. National’s long history in sealing solutions and ongoing product development make this a practical replacement for transmission service on vehicles such as BMW 328i, BMW 335i, BMW M5, and Mercedes-Benz C230.

This part cross-references Hayden 5904 and Timken SL260128 for the same application.

What It Helps Fix

• Transmission fluid seepage around the shift shaft
• Oil residue collecting on the transmission exterior
• Worn or hardened shaft seal material
• Leak-related low fluid condition from the shift shaft area
• Service issues on manual transmissions with a leaking selector shaft seal

Installation Notes and Tips

Confirm shaft diameter, housing bore, and seal width before installation. Clean the bore and shaft surface thoroughly, and inspect for grooves, corrosion, or damage that could affect sealing. Match the seal to the exact transmission configuration listed in the fitment data, including applications such as BMW 530i with ZF S6-37 Transmission, BMW M3 with Getrag 226 Transmission, and Mercedes-Benz SLK350.

For fitment verification, this seal is listed for 2016-2019 BMW M2, 2015-2019 BMW M4, 2016-2019 Jaguar F-Type, 2007-2016 BMW 328i, 2002-2009 Mercedes-Benz C230, and many other manual transmission applications across the expanded vehicle list.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and continues to develop sealing products for modern vehicles. National 710714 is built to meet the dimensional and material requirements of the listed manual transmission applications.