Timken 312518 Manual Transmission Shift Shaft Seal

Reliable Manual Transmission Shift Shaft Seal for Buick and Chevrolet

The Timken 312518 manual transmission shift shaft seal is engineered to provide durable sealing performance for select Buick, Chevrolet, GMC, and Pontiac models. Designed with precision dimensions and high-quality S-nitrile material, this seal helps maintain transmission integrity and prevent fluid leaks.

• Constructed from durable S-nitrile material for resistance to heat and wear
• Outside diameter measures 1.006 inches (25.55 mm) ensuring a precise fit
• Shaft diameter of 0.750 inches (19.05 mm) for accurate sealing around the shift shaft
• Housing bore dimension of 1.000 inches (25.40 mm) for proper installation
• Seal width of 0.126 inches (3.20 mm) designed for optimal sealing performance
• Seal type 31, compatible with manual transmission shift shafts

Technical Details and Compatibility

The Timken 312518 manual transmission shift shaft seal is specifically designed for use in manual transmissions of various Buick, Chevrolet, GMC, and Pontiac vehicles. Compatible models include Buick Skyhawk and Sunbird, Chevrolet Monza, GMC G20, G30, P20, P30, P2500, and P3500, as well as Pontiac G20 and G30. The seal’s S-nitrile construction offers excellent resistance to transmission fluids and temperature variations, ensuring long-lasting performance. Precise measurements such as the 1.006 inch outside diameter and 0.750 inch shaft diameter guarantee a secure fit that prevents leaks and contamination.

Common Applications and Problem Solving

• Prevents manual transmission fluid leaks around the shift shaft
• Reduces risk of contamination entering the transmission system
• Maintains proper lubrication within the transmission housing
• Helps avoid premature wear of transmission components due to fluid loss
• Ensures smooth shifting performance by maintaining seal integrity

Installation Notes and Tips

When installing the Timken 312518 shift shaft seal, ensure the transmission housing bore is clean and free of debris. Carefully align the seal with the shaft and housing bore to avoid damage during installation. Use appropriate tools to press the seal evenly into place without distortion. Verify the seal type 31 matches the original equipment specifications for your vehicle model. Proper installation will help maintain the seal’s effectiveness and extend transmission life.

Quality Assurance and Warranty

Timken manufactures the 312518 manual transmission shift shaft seal to meet stringent quality standards. The use of S-nitrile material and precise dimensional tolerances ensures reliable sealing performance under normal operating conditions. While specific warranty details may vary, Timken products typically come with a limited warranty against defects in material and workmanship, providing confidence in the product’s durability and function.