National 710871 Engine Crankshaft Seal - Rear

Overview of National Engine Crankshaft Seal 710871

The National 710871 engine crankshaft seal is designed to provide reliable sealing performance for various Toyota, Lexus, and Scion models. Engineered with fluoro-elastomer material and a counter-clockwise-spiral lip design, this oil seal ensures effective protection against oil leaks and contamination.

• Inside diameter: 89.0 mm (3.504 inches)
• Outside diameter: 105.3 mm (4.146 inches)
• Thickness/width: 8.5 mm (0.335 inches)
• Material: Durable fluoro-elastomer for heat and chemical resistance
• Helix type: Counter-clockwise spiral lip design for enhanced sealing
• Housing bore diameter: 105.0 mm (4.134 inches)
• Compatible with multiple Toyota, Lexus, and Scion models

Technical Details and Specifications

The National 710871 crankshaft seal belongs to the 710800 series and is constructed from fluoro-elastomer, a material known for its resistance to high temperatures and automotive fluids. The seal features a 32-type design with a counter-clockwise spiral lip, which helps maintain a tight seal around the crankshaft, preventing oil leakage and ingress of contaminants. With an inside diameter of 89 mm and an outside diameter of 105.3 mm, this seal fits precisely into the housing bore of 105 mm, ensuring a secure installation. The thickness of 8.5 mm provides durability and stability during engine operation.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of Toyota, Lexus, and Scion vehicles, including but not limited to the Toyota Camry, RAV4, Tacoma, Highlander, Avalon, Sienna, and Venza, as well as Lexus IS250, NX300h, ES300h, and Scion tC models. The part number 710871 is specifically designed to meet the OEM specifications for these vehicles, making it suitable for engine maintenance and repair tasks involving crankshaft sealing.

Common Issues Addressed by the National 710871 Seal

• Prevents oil leaks from the crankshaft area
• Reduces contamination of engine oil by external debris
• Maintains engine oil pressure and lubrication efficiency
• Protects engine components from premature wear due to oil loss
• Helps avoid costly engine repairs related to seal failure

Installation Notes and Tips

When installing the National 710871 crankshaft seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the bore without damaging the lip or seal body. Verify the orientation of the counter-clockwise spiral lip design to match the engine’s rotation direction. Lubricate the seal lip lightly with clean engine oil before installation to reduce initial wear. Follow vehicle-specific service manual instructions for torque specifications and installation procedures.

Quality Assurance and Warranty

National engine crankshaft seals are manufactured to meet industry standards for durability and performance. The fluoro-elastomer material and precision design contribute to long service life under normal operating conditions. The 710871 seal is backed by National’s quality control processes, ensuring consistent fit and function. Warranty coverage details should be confirmed with the original equipment manufacturer or authorized distributor.