National 710511 Manual Transmission Input Shaft Seal - Outer

Manual Transmission Input Shaft Seal for Mazda and Isuzu

National 710511 is a metric manual transmission input shaft seal built with a polyacrylate sealing material and a clockwise-spiral lip design. It is specified for a range of Mazda, Isuzu, and Honda applications, including Mazda Miata, Mazda RX-7, Isuzu Rodeo, and Honda Passport models with the listed transmissions.

Key Features

• Manual transmission input shaft seal for transmission sealing service
• Polyacrylate construction for sealing performance in drivetrain applications
• Clockwise-spiral lip design to support controlled oil retention
• Metric dimensions: 27.000 mm shaft diameter, 43.200 mm outside diameter, 7.000 mm width
• Housing bore diameter: 43.000 mm
• Part description: oil seal
• National 710511 and series 710500 identification

Detailed Description

National 710511 is a manual transmission input shaft seal engineered for metric applications where the transmission input shaft must be sealed against fluid loss. The seal measures 1.063 inches (27.000 mm) inside diameter, 1.701 inches (43.200 mm) outside diameter, and 0.276 inches (7.000 mm) thick, with a 1.693-inch (43.000 mm) housing bore. Its polyacrylate material and clockwise-spiral lip design are suited to transmission sealing demands in Mazda and Isuzu drivetrains.

This part is listed for vehicles such as the Mazda Miata, Mazda RX-7, Mazda B2600, Isuzu Rodeo, Isuzu Amigo, and Honda Passport across the model years shown in the fitment data. This part cross-references OE-style numbers such as 8-97046-698-0 and NA5378 for the same application. National 710511 is a direct-fit sealing component for the specified transmission configurations.

What It Helps Address

• Transmission fluid seepage at the input shaft area
• Oil leakage from a worn or hardened manual transmission seal
• Contamination around the bellhousing from seal failure
• Loss of transmission fluid level caused by sealing wear
• Service replacement for Mazda and Isuzu manual transmission seal maintenance

Installation Notes and Tips

• Verify transmission code and application before installation, including Mazda M15M-D, Mazda R15M-D, Mazda G5M-R, Isuzu MUA5-CT, and related listed units.
• Inspect the input shaft and housing bore for wear, scoring, or corrosion before installing the new seal.
• Clean the sealing surface and ensure the seal is seated squarely to the specified depth.
• Use proper installation tools to avoid damaging the lip or outer case during fitment.
• Confirm the seal orientation matches the transmission design before reassembly.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle applications. National 710511 reflects that experience with a transmission seal designed around published metric dimensions and application-specific fitment data.