National 222742 Manual Transmission Input Shaft Seal

Manual Transmission Input Shaft Seal for Select Imports

National 222742 is a metric manual transmission input shaft seal built with fluoro-elastomer material for sealing performance in demanding driveline environments. It is specified for a 27.0 mm shaft and 42.1 mm housing bore, making it a direct-fit option for a range of Honda, Acura, Ford, Mazda, Nissan, Hyundai, and Mercury manual transmission applications.

Key Features

• Manual transmission input shaft seal / oil seal for driveline sealing service
• Fluoro-elastomer construction for resistance to transmission fluid and heat
• Inside diameter: 1.063 in. / 27.0 mm
• Outside diameter: 1.657 in. / 42.1 mm
• Width: 0.276 in. / 7.0 mm
• Housing bore: 1.654 in. / 42.0 mm
• Metric dimensioned seal from National Series 220000
• Part number 222742 for catalog and cross-reference lookup

Detailed Description

National 222742 is engineered as a manual transmission input shaft seal for vehicles using the listed transmission families, including Ford MTX-75 and Aichi MFA60 applications, along with several Honda-based manual transmission platforms. This seal helps maintain proper lubricant retention at the input shaft area, where rotating components and transmission fluid exposure demand a precise sealing surface. National has supplied sealing solutions for more than 75 years, and this part reflects that focus with a metric oil seal design sized for the specified shaft and bore dimensions. This part cross-references CSF 10627 for the same application.

Compatible With select Ford Focus, Mazda 3, Nissan Altima, and Honda Civic manual transmission applications, National 222742 supports service work where the original input shaft seal has worn, hardened, or begun leaking. It is also listed for Acura EL, Mercury Cougar, Ford Contour, and other manual transmission platforms shown in the fitment data.

What It Helps Fix

• Transmission fluid seepage at the input shaft seal area
• Oil residue around the bellhousing or transmission case
• Seal wear caused by age, heat, and drivetrain movement
• Loss of lubricant that can affect manual transmission operation
• Service issues on vehicles with MTX-75 or Aichi MFA60 transmissions

Installation Notes and Tips

Verify shaft diameter, housing bore, and transmission family before installation. Clean the bore and shaft sealing surface thoroughly, and inspect for scoring or wear that could affect seal life. For best results, install the seal squarely to avoid distortion of the fluoro-elastomer lip. Confirm application details for Fits 2000-2016 Ford Focus, 2007-2012 Mazda 3, 2005-2012 Nissan Altima, and other listed manual transmission vehicles before service.

Quality Assurance

National is recognized for premium sealing solutions and long-term industry experience. Part number 222742 is built to the stated metric dimensions and material specification for consistent fitment in the listed manual transmission applications.