National 321460 Engine Crankshaft Seal - Front

National Engine Crankshaft Seal 321460 Overview

The National 321460 engine crankshaft seal is designed for reliable sealing performance in various Dodge and Jeep models. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 1.781 inches (45.240 mm)
• Outside diameter: 2.259 inches (57.380 mm)
• Thickness/width: 0.375 inches (9.530 mm)
• Material: Durable nitrile rubber for oil resistance
• Helix type: Clockwise-spiral lip design for effective sealing
• Compatible housing bore: 2.251 inches (57.180 mm)
• Part number: 321460, Series 320000

Technical Details and Material Specifications

This National crankshaft seal features a nitrile rubber construction, chosen for its resistance to oil, heat, and wear. The seal’s clockwise-spiral lip design enhances its ability to maintain a tight seal around the crankshaft, reducing the risk of oil leakage. With an inside diameter of 1.781 inches and an outside diameter of 2.259 inches, it fits precisely within the housing bore of 2.251 inches, ensuring proper installation and function. The 0.375-inch thickness provides durability and stability under engine operating conditions.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of Dodge and Jeep vehicles, including Cherokee, CJ5, CJ7, Comanche, Dakota, Grand Cherokee, Grand Wagoneer, J10, J20, Scrambler, TJ, Wagoneer, and Wrangler models. It is specifically designed to meet the sealing requirements of these vehicles’ engines, making it a suitable replacement part for maintenance and repair.

Common Issues Addressed by National 321460 Seal

• Prevents oil leaks around the crankshaft area
• Reduces engine contamination from external debris
• Maintains proper oil pressure and lubrication
• Minimizes wear on crankshaft and engine components
• Helps avoid costly engine damage due to oil loss

Installation Notes and Tips

Ensure the crankshaft and housing bore are clean and free of debris before installation. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Verify the seal’s orientation matches the clockwise-spiral lip design for optimal performance. Lubricate the seal lip lightly with engine oil prior to installation to reduce initial wear. Check for proper fitment with the specified inside and outside diameters to avoid leaks.

Quality Assurance and Warranty

National engine crankshaft seals are manufactured to meet industry standards for durability and performance. The nitrile material and design specifications ensure consistent sealing under typical engine conditions. Part number 321460 is part of the 320000 series, known for reliable sealing solutions. Warranty coverage details should be confirmed with the product documentation or supplier.