Timken 1987S Manual Transmission Output Shaft Seal - Front or Rear

Manual Transmission Output Shaft Seal for Toyota and Isuzu

Timken 1987S is a manual transmission output shaft seal built for precise sealing at the transmission shaft interface. It helps retain lubricant, block debris entry, and maintain a cleaner sealing surface across a wide range of Toyota, Geo, Chevrolet, Pontiac, and Isuzu manual transmission applications.

• Precision sealing design helps control lubricant escape and keep contaminants out
• Reinforced outer case helps resist installation damage and supports durability
• Ribbed rubber inner diameter helps seal minor spindle imperfections and promote positive seating
• Internal contamination exclusion system helps reduce debris penetration that can lead to leakage
• Vent holes allow lubricant flow around the seal lip to help reduce heat build-up
• N-Polyacrylate material for transmission sealing service

Detailed Product Overview

Timken 1987S is a manual transmission output shaft seal designed around the shaft and housing dimensions needed for a secure fit: 1.375 in. shaft diameter, 1.937 in. housing bore, 1.954 in. outside diameter, and 0.235 in. width. The N-Polyacrylate construction is paired with a reinforced outer case and ribbed inner diameter to support sealing performance where the shaft surface may show minor wear. This seal is a direct-fit service part for applications such as 2001-2009 Toyota Prius, 1983-1997 Toyota Corolla, and 1982-1987 Isuzu Pickup, along with other listed Toyota, Geo, Chevrolet, Pontiac, and Isuzu manual transmission vehicles. This part cross-references National 1987 for the same application.

What This Seal Helps Address

• Transmission fluid seepage at the output shaft
• Contamination entering the transmission through a worn seal area
• Leakage caused by minor shaft surface imperfections
• Heat-related seal wear from poor lubricant circulation at the lip
• Service issues on Toyota Corolla, Toyota Celica, and Isuzu Pickup manual transmission applications

Installation Notes and Tips

Verify shaft diameter, housing bore, and width before installation to confirm the seal matches the transmission case. Inspect the shaft surface for scoring, burrs, or corrosion before pressing the seal into place. Clean the bore and sealing surface thoroughly, and install the seal squarely to avoid distortion of the outer case or sealing lip. Confirm the application by year, make, model, and transmission configuration, especially on Toyota Tercel, Toyota MR2, and Isuzu I-Mark listings with multiple positions or transmission codes.

Quality Assurance

Timken oil and grease seals are engineered with precision sealing features and contamination control details to support dependable service in drivetrain applications. Timken 1987S is built to the dimensional and material requirements listed above for manual transmission output shaft sealing service.