National 331227H Automatic Transmission Oil Pump Seal - Front

Overview of National 331227H Automatic Transmission Oil Pump Seal

The National 331227H automatic transmission oil pump seal is engineered to provide reliable sealing performance for a range of vehicles including Jeep, Dodge, Land Rover, and Maserati models. Designed with durable silicone material and a clockwise-spiral lip design, this seal ensures effective oil retention and transmission protection.

• Inside diameter: 1.875 inches (47.63 mm)
• Outside diameter: 2.628 inches (66.75 mm)
• Flanged outside diameter: 2.868 inches (72.85 mm)
• Thickness/width: 0.375 inches (9.53 mm)
• Sealing material: Silicone for enhanced durability and heat resistance
• Helix type: Clockwise-spiral lip design for improved sealing efficiency
• Compatible with multiple makes and models including Jeep Grand Cherokee, Dodge Ram 1500, Land Rover Range Rover, and Maserati Quattroporte

Detailed Product Description and Specifications

The National 331227H oil seal is part of the 330000 series and is specifically designed for automatic transmission oil pumps. Its silicone construction offers excellent resistance to heat and wear, making it suitable for demanding transmission environments. The seal features a precise inside diameter of 1.875 inches (47.63 mm) to fit the shaft snugly, while the outside diameter of 2.628 inches (66.75 mm) matches the housing bore diameter of 2.624 inches (66.65 mm) to ensure a secure fit. The flanged outside diameter of 2.868 inches (72.85 mm) provides additional stability during installation. The clockwise-spiral lip design enhances sealing performance by maintaining consistent contact with the shaft, reducing the risk of leaks and contamination.

Compatible Vehicles and Applications

This automatic transmission oil pump seal is compatible with a variety of vehicles, including but not limited to:

• Jeep Grand Cherokee and Cherokee models
• Dodge Ram 1500, 2500, and 3500 series trucks and vans
• Land Rover Range Rover and other Land Rover models
• Maserati Quattroporte and Biturbo
• Additional fitment includes Chrysler, Plymouth, and Aston Martin models such as the Chrysler Aspen and Plymouth Barracuda

Common Issues Addressed by the National 331227H Seal

• Prevents automatic transmission fluid leaks around the oil pump shaft
• Reduces contamination ingress that can damage transmission components
• Maintains proper hydraulic pressure within the transmission system
• Minimizes premature wear of transmission seals and bearings
• Helps avoid costly transmission repairs due to fluid loss

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing
• Lubricate the seal lip with transmission fluid prior to installation to reduce initial wear
• Check for proper fitment with the specific vehicle model to avoid leaks

Quality Assurance and Warranty

National transmission seals, including the 331227H, are manufactured to meet strict industry standards for durability and performance. The use of silicone material ensures resistance to heat and chemical degradation commonly encountered in automatic transmissions. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.