National 224250 Manual Transmission Input Shaft Seal

Manual Transmission Input Shaft Seal for OE-Style Repair

National 224250 is a metric nitrile oil seal used in transmission sealing applications where a precise shaft-to-housing seal is required. With a 1.654 in. (42.000 mm) shaft diameter, 2.452 in. (62.270 mm) outside diameter, and 0.315 in. (8.000 mm) width, this seal is built for accurate fitment in a wide range of import drivetrains.

National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and material selection. The 224250 is a practical replacement for manual transmission input shaft seal service on vehicles including BMW X5, Mercedes-Benz Sprinter, and Jeep Wrangler applications listed below.

Key Features

• Manual transmission input shaft seal / oil seal
• Metric dimensions for OE-style replacement fit
• Nitrile sealing material for common transmission sealing needs
• 1.654 in. shaft diameter, 2.452 in. outside diameter, 0.315 in. width
• Housing bore: 2.441 in. (62.000 mm)
• National 224250 part number for easy cross-reference

Detailed Description

National 224250 is engineered as a metric oil seal for transmission sealing systems, with dimensions that support a tight, accurate interface between the shaft and housing bore. The nitrile sealing material is commonly used in drivetrain service for dependable sealing performance in manual transmission input shaft applications. This part cross-references SKF 16521 for the same application.

Use National 224250 when servicing vehicles that call for this seal size and type, including fitments such as 2010-2018 BMW X3, front; 2009-2018 BMW X5, front; 2010-2015 Mercedes-Benz Sprinter 2500; and 2012-2017 Jeep Wrangler. It also appears in applications across Mercedes-Benz, BMW, Dodge, Land Rover, Isuzu, Jaguar, Honda, Acura, and Volkswagen models listed in the fitment data.

Common Problems This Seal Can Address

• Transmission fluid leakage at the input shaft area
• Oil seepage from a worn or hardened seal lip
• Contamination entering the transmission through a damaged seal
• Service issues caused by incorrect seal dimensions
• Repeat leaks after prior seal wear in high-mileage drivetrains

Installation Notes and Tips

• Verify shaft diameter, housing bore, and width before installation.
• Inspect the shaft surface for grooves, scoring, or corrosion before fitting the new seal.
• Clean the bore and sealing surface thoroughly to avoid premature leakage.
• Install squarely to prevent lip distortion and uneven wear.
• Confirm the exact vehicle, transmission, and transfer case configuration against the fitment list, especially on BMW X5, Mercedes-Benz Sprinter, and Jeep Wrangler applications.

Quality Assurance

National has built its reputation on premium sealing products and long-term industry experience. Part number 224250 is backed by that sealing-focused engineering approach and is specified with clear metric dimensions for accurate replacement selection.