National 710187 Engine Crankshaft Seal - Front

Overview of National 710187 Engine Crankshaft Seal

The National 710187 engine crankshaft seal is designed to provide reliable sealing performance for select Lexus and Toyota vehicles. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 2.047 inches (52.000 mm)
• Outside diameter: 2.766 inches (70.270 mm)
• Thickness/width: 0.335 inches (8.500 mm)
• Material: Polyacrylate for durability and resistance
• Clockwise-spiral lip design for effective sealing
• Compatible housing bore: 2.756 inches (70.000 mm)
• Part number: 710187, Series 710100

Detailed Product Description

This National engine crankshaft seal (part number 710187) features a polyacrylate construction that offers strong resistance to heat, oil, 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 2.047 inches and an outside diameter of 2.766 inches, it fits precisely within a 2.756-inch housing bore, ensuring proper installation and function. The 0.335-inch thickness provides a robust barrier against contaminants while maintaining flexibility for dynamic engine conditions.

Compatible Vehicles and Applications

This crankshaft seal is compatible with various Lexus and Toyota models, including:

• Lexus LX450
• Toyota Cressida
• Toyota Land Cruiser
• Toyota Supra

It is specifically designed to replace worn or damaged seals in these vehicles, helping to restore engine sealing performance and prevent oil leaks.

Common Issues Addressed by This Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination ingress into the engine
• Maintains proper oil pressure and lubrication
• Minimizes engine wear caused by oil loss
• Helps avoid costly engine repairs due to seal failure

Installation Notes and Tips

Ensure the crankshaft and housing bore are clean and free of debris before installation. Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing. Use appropriate tools to press the seal evenly into the housing bore without damaging the lip or seal body. 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 polyacrylate material and precision design contribute to long service life under normal operating conditions. While specific warranty details are not provided, National products typically adhere to quality control processes to ensure reliability in automotive applications.