National 221607 Manual Transmission Shift Shaft Seal

Manual Transmission Shift Shaft Seal for Honda and Acura

National 221607 is a metric manual transmission shift shaft seal built for sealing the shift shaft area and helping maintain proper transmission fluid retention. It is a direct-fit oil seal for select Honda and Acura manual transmission applications, including Honda Accord, CR-V, Prelude, Civic del Sol, and Acura CL and Legend.

Key Features

• Manual transmission shift shaft seal / oil seal
• National 221607 part number for identification and ordering
• Polyacrylate sealing material for transmission sealing applications
• Metric dimensions: 16.000 mm shaft diameter, 27.200 mm outside diameter, 14.000 mm width
• Housing bore: 27.000 mm
• Series 220000, Type 35
• Cross-reference: SKF 553104

Product Details

This National oil seal is engineered around precise dimensional specs to match the shaft and housing requirements of the application. The 0.630-inch inside diameter, 1.071-inch outside diameter, and 0.551-inch thickness support a controlled seal interface in the transmission case. National has supplied sealing solutions for more than 75 years, and this part reflects that focus on fit, material selection, and durability for drivetrain service. National 221607 is a practical replacement choice for manual transmission shift shaft sealing on vehicles such as Honda Accord and Honda CR-V, as well as Prelude, Civic del Sol, Acura CL, and Acura Legend.

Common Problems This Seal Can Address

• Transmission fluid seepage around the shift shaft
• Oil residue collecting near the transmission housing
• Seal wear from age, heat, and normal drivetrain movement
• Loss of sealing integrity at the shaft-to-housing interface
• Service replacement during manual transmission repair

Installation Notes and Tips

• Verify shaft diameter and housing bore before installation: 16.000 mm shaft and 27.000 mm housing bore.
• Inspect the shaft surface for scoring or wear that could affect sealing.
• Clean the bore and surrounding area thoroughly before pressing in the new seal.
• Use proper seal installation tools to avoid damaging the sealing lip or case.
• Confirm the transmission application by year, make, and model before ordering.

Quality Assurance

National designs sealing components with current vehicle service requirements in mind and backs the part with more than 75 years of sealing industry experience. Part number 221607 is built to meet the dimensional and material needs of the listed manual transmission applications.