National 6988H Automatic Transmission Torque Converter Seal - Front

Overview of National 6988H Automatic Transmission Torque Converter Seal

The National 6988H automatic transmission torque converter seal is engineered to provide reliable sealing performance for select Ford, Jaguar, Lincoln, and Mercury vehicles. Designed with precision silicone material, this oil seal ensures durability and effective protection against fluid leaks in your transmission system.

• Inside diameter: 1.937 inches (49.200 mm)
• Outside diameter: 2.690 inches (68.330 mm)
• Thickness/width: 0.500 inches (12.700 mm)
• Sealing material: Silicone for enhanced resistance and flexibility
• Housing bore compatibility: 2.686 inches (68.220 mm)
• Part type: Automatic transmission torque converter seal
• Series: 6000

Detailed Product Description and Specifications

The National 6988H torque converter seal is crafted from high-quality silicone, a material known for its excellent sealing properties and resistance to heat and wear. With an inside diameter of 1.937 inches and an outside diameter of 2.690 inches, this seal fits precisely within the housing bore of 2.686 inches, ensuring a tight and secure fit. The 0.500-inch thickness provides the necessary durability to withstand the pressures and temperatures typical in automatic transmission systems.

This seal is part of National's 6000 series, which focuses on reliable sealing solutions for transmission components. Its design helps maintain proper fluid containment within the torque converter, preventing leaks that could lead to transmission damage or performance issues.

Compatible Vehicles and Applications

This torque converter seal is compatible with a range of Ford, Jaguar, Lincoln, and Mercury models, including:

• Ford F-100, F-250, F-350, Mustang, Thunderbird, LTD
• Jaguar XJ, XJ6, XJ12, XJS
• Lincoln Continental, Town Car, Mark series
• Mercury Colony Park, Marauder, Marquis, Villager, Cougar

Using the National 6988H seal in these vehicles helps maintain transmission integrity and fluid retention, essential for smooth operation and longevity.

Common Issues Addressed by the National 6988H Seal

• Prevents automatic transmission fluid leaks around the torque converter
• Reduces risk of transmission overheating due to fluid loss
• Minimizes contamination ingress into the transmission system
• Helps maintain proper hydraulic pressure within the transmission
• Prevents premature wear of transmission components caused by fluid leakage

Installation Notes and Tips

• Ensure the housing bore and shaft surfaces are clean and free of debris before installation
• Use appropriate tools to avoid damaging the silicone seal during installation
• Verify the seal orientation matches manufacturer specifications for proper fit
• Inspect the torque converter and transmission components for wear or damage prior to seal replacement
• Apply a light coating of transmission fluid to the seal lips to facilitate installation and initial operation

Quality Assurance and Warranty Information

National manufactures the 6988H torque converter seal to meet industry standards for durability and performance. The use of silicone material ensures resistance to heat, oil, and wear, contributing to a longer service life. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.