National 240698 Manual Transmission Overdrive Solenoid Seal

Overview of National Manual Transmission Overdrive Solenoid Seal 240698

The National 240698 manual transmission overdrive solenoid seal is engineered to provide reliable sealing performance for a range of classic and modern vehicles. Designed with nitrile material, this oil seal ensures durability and resistance to transmission fluids, making it suitable for Chevrolet, Ford, Jeep, Mercury, and Pontiac models.

• Inside diameter options: 0.312 inch (7.920 mm)
• Outside diameter: 0.635 inch (16.130 mm)
• Thickness/width: 0.175 inch (4.450 mm)
• Sealing material: Nitrile for enhanced fluid resistance
• Compatible housing bore: 0.625 inch (15.880 mm)

Technical Details and Specifications

This National manual transmission overdrive solenoid seal (part number 240698) belongs to the 240000 series and is constructed from nitrile, a material known for its excellent resistance to oil and heat. The seal features a precise inside diameter of 0.312 inch (7.920 mm) and an outside diameter of 0.635 inch (16.130 mm), with a thickness of 0.175 inch (4.450 mm). These dimensions ensure a secure fit within the housing bore of 0.625 inch (15.880 mm), providing effective sealing to prevent fluid leaks in manual transmission overdrive solenoids.

Compatible Vehicles and Applications

This oil seal is compatible with a variety of vehicles, including Chevrolet models such as the Bel Air, Caprice, Impala, and Corvette; Ford trucks like the F-100, F-250, and F-350; Jeep CJ5 and Wagoneer; Mercury Cougar, Marquis, and LTD; as well as Pontiac Acadian and Colony Park. The National 240698 seal is designed specifically for manual transmission overdrive solenoids in these vehicles, ensuring proper fit and function.

Common Issues Addressed by the Overdrive Solenoid Seal

• Prevents transmission fluid leaks around the overdrive solenoid shaft
• Reduces contamination ingress that can cause solenoid malfunction
• Maintains proper hydraulic pressure within the transmission system
• Minimizes wear on transmission components by maintaining lubrication
• Helps avoid costly transmission repairs due to seal failure

Installation Notes and Tips

• Ensure the housing bore is clean and free of debris before installation
• Use appropriate tools to avoid damaging the nitrile seal during fitting
• Verify the seal dimensions match the original equipment specifications
• Lubricate the seal lightly with transmission fluid before installation for easier fit
• Inspect the overdrive solenoid shaft for wear or damage prior to seal replacement

Quality Assurance and Warranty Information

National manufactures the 240698 manual transmission overdrive solenoid seal to meet industry standards for durability and performance. The nitrile material provides reliable sealing under typical operating temperatures and fluid exposure. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, ensuring confidence in the part's quality and longevity.