Timken 251511 Manual Transmission Input Shaft Seal - Front

Overview of Timken Manual Transmission Input Shaft Seal 251511

The Timken 251511 manual transmission input shaft seal is engineered for reliable sealing performance in select Chevrolet and Oldsmobile models. Designed with durable S-nitrile material, this seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Constructed from high-quality S-nitrile for resistance to heat and wear
• Outside diameter options: 1.634 inches (41.50 mm)
• Shaft diameter: 1.250 inches (31.75 mm)
• Housing bore dimensions: 1.625 inches (41.27 mm)
• Seal width: 0.188 inches (4.78 mm)
• Seal type: 25, suitable for manual transmission input shafts

Technical Details and Specifications

This Timken manual transmission input shaft seal (part number 251511) is specifically designed to fit manual transmissions in Chevrolet and Oldsmobile vehicles, including models such as the Cutlass, Cutlass Supreme, Monza, Omega, and Starfire. The seal’s S-nitrile composition offers excellent resistance to petroleum-based fluids and high temperatures commonly found in transmission environments. The precise dimensions—1.634 inch outside diameter and 1.250 inch shaft diameter—ensure a secure fit within the housing bore of 1.625 inches, maintaining a tight seal to prevent leaks.

Applications and Problem Solving

• Prevents transmission fluid leaks from the input shaft area
• Protects transmission internals from dirt and debris contamination
• Reduces wear on transmission components by maintaining proper lubrication
• Helps avoid costly transmission repairs due to seal failure
• Ensures consistent transmission performance in Chevrolet Cutlass and Oldsmobile models

Installation Notes and Tips

• Verify compatibility with your vehicle’s make and model before installation
• Clean the housing bore and shaft thoroughly to remove old sealant and debris
• Use appropriate tools to press the seal evenly into the housing bore without damage
• Inspect the shaft for wear or damage before installing the new seal
• Apply a light coating of transmission fluid to the seal lip to ease installation and initial operation

Quality Assurance and Warranty

Timken manufactures the 251511 manual transmission input shaft seal to meet industry standards for durability and performance. The use of S-nitrile material ensures resistance to heat and fluid degradation. While specific warranty details may vary, Timken products typically come with a limited warranty against manufacturing defects. Always consult the product documentation or Timken directly for warranty terms related to this part.