National 1147 Manual Transmission Output Shaft Seal - Left or Right

Manual Transmission Output Shaft Seal for Honda and Acura

National 1147 is a manual transmission output shaft seal built for specific Honda and Acura applications. It uses a polyacrylate sealing material and a clockwise-spiral lip design to help maintain a tight seal at the transmission shaft.

With metric dimensions and OE-style sizing, this seal is a direct-fit service part for many Honda Civic, Prelude, Accord, CRX, Civic del Sol, Integra, and Acura EL applications. National 1147 is engineered for the right or left side depending on the vehicle and transmission listed below.

Key Features

• Manual transmission output shaft seal / oil seal
• Part number: 1147
• Polyacrylate sealing material for transmission sealing applications
• Clockwise-spiral lip design
• Metric dimensions: 35.000 mm shaft ID, 76.280 mm outside diameter, 9.000 mm width
• Housing bore: 76.000 mm
• Overall width with side lip: 12.500 mm
• Fits select Honda Civic and Acura EL manual transmission applications

Detailed Description

National 1147 is a transmission sealing component designed for the output shaft area of manual gearboxes. The seal’s polyacrylate material and spiral lip profile are specified to support consistent sealing performance where rotating shafts pass through the transmission case. Its metric sizing and Type 40 construction align with the listed Honda and Acura fitments, including Honda Civic, Honda Prelude, Honda Accord, Honda CRX, Honda Civic del Sol, Acura Integra, and Acura EL applications.

National has supplied sealing solutions for decades and continues to develop parts for modern and legacy drivetrains. This part cross-references ATP HO-25 and Beck/Arnley 052-2813 for the same application.

What This Part Helps Address

• Transmission fluid leaking from the output shaft area
• Oil seepage around the manual transmission case
• Seal wear from shaft rotation and age
• Fluid loss that can leave residue near the transmission housing
• Service replacement needs on older Honda and Acura manual transmissions

Installation Notes and Tips

Confirm shaft diameter, housing bore, and transmission code before installation. Clean the bore and shaft surface thoroughly, and inspect for grooves, corrosion, or damage that could affect sealing. Match the seal position and transmission application exactly, since this part is listed for both right and left side applications depending on vehicle and gearbox.

• Fits 2001-2005 Acura EL, right, with Automatic Transmission; 4 Speed
• Fits 2002-2005 Acura EL, right, with 4-Speed Honda SLXA Transmission
• Fits 1986-2005 Honda Civic, right
• Fits 1999-2000 Acura EL, right, 4 Speed
• Fits 2000 Acura EL, right, with 4-Speed Honda S4RA Transmission
• Fits 1997-1999 Acura EL, right, with 4-Speed Honda B4RA Transmission
• Fits 1998-1999 Acura EL, right, with 4-Speed Honda M4RA Transmission
• Fits 1997-1998 Acura EL, right
• Fits 1993-1997 Honda Civic del Sol, right
• Fits 1988-1991 Honda CRX, right
• Fits 1986-1989 Acura Integra, right
• Fits 1989 Honda Prelude, right
• Fits 1979-1987 Honda Prelude, right
• Fits 1984-1987 Honda Civic, left, with Honda GWH49 Transmission
• Fits 1983-1985 Honda Accord, left
• Fits 1980-1985 Honda Accord, right
• Fits 1983-1985 Honda Prelude, left
• Fits 1980-1983 Honda Civic, right, with Honda GM-8 Transmission
• Fits 1980-1983 Honda Civic, left, with Honda GWH48 Transmission
• Fits 1979 Honda Accord, right, with Honda GKH50 Transmission
• Fits 1979 Honda Accord, right, with Honda GKH55 Transmission
• Fits 1975-1979 Honda Civic, right, with Honda GWH47 Transmission
• Fits 1976-1978 Honda Accord, left, with Honda GSH45 Transmission

Quality Assurance

National is recognized for sealing products and has more than 75 years of experience in the category. The brand’s engineering focus supports accurate fitment and modern sealing design for service replacement use.