National 710288 Engine Crankshaft Seal - Rear

Overview of National Engine Crankshaft Seal 710288

The National 710288 engine crankshaft seal is designed for precise fitment and reliable sealing in various Mercedes-Benz models. Engineered with fluoro-elastomer material and a counter-clockwise spiral lip design, this oil seal ensures effective protection against oil leaks and contaminants.

• Inside diameter: 3.661 inches (93.000 mm)
• Outside diameter: 4.501 inches (114.330 mm)
• Thickness/width: 0.512 inches (13.000 mm)
• Material: Durable fluoro-elastomer for high resistance
• Helix type: Counter-clockwise spiral lip design for enhanced sealing
• Compatible housing bore: 4.488 inches (114.000 mm)
• Part number: 710288, Series 710200

Technical Details and Specifications

This National engine crankshaft seal (part number 710288) is constructed from fluoro-elastomer, a material known for its resistance to heat, oil, and chemicals, making it suitable for demanding engine environments. The seal features a counter-clockwise spiral lip design that improves sealing efficiency by maintaining consistent contact with the crankshaft, reducing the risk of oil leakage. With an inside diameter of 3.661 inches and an outside diameter of 4.501 inches, it fits precisely into the housing bore of 4.488 inches, ensuring a secure installation. The 0.512-inch thickness provides durability and stability during engine operation.

Compatible Mercedes-Benz Models

This crankshaft seal is compatible with a wide range of Mercedes-Benz vehicles, including but not limited to the 190E, 260E, 300CE, 300D, 300E, 300SD, 300SDL, 300SE, 300SEL, 300SL, 300TD, 300TE, 350SD, 350SDL, 380SE, 380SEC, 380SEL, 380SL, 380SLC, 400E, 400SE, 400SEL, 420SEL, 500E, 500SEC, 500SEL, 500SL, 560SEC, 560SEL, 560SL, 600SEC, 600SEL, 600SL, C36 AMG, C220, C230, C240, C280, CL500, CL600, E300, E320, E420, E500, G500, ML500, R500, S320, S350, S420, S500, S600, SL320, SL500, SL600, and SLK230 models.

Common Applications and Problem Solving

• Prevents oil leaks around the engine crankshaft
• Protects engine components from dirt and contaminants
• Maintains engine oil pressure and efficiency
• Reduces wear on crankshaft and surrounding parts
• 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. Use appropriate tools to press the seal evenly into the housing bore without damaging the lip or seal surface. Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing performance. Lubricate the seal lip lightly with engine oil to reduce initial wear during startup.

Quality Assurance and Warranty

National engine crankshaft seals are manufactured to meet OEM specifications for fit, form, and function. The fluoro-elastomer material and precision design contribute to long service life under normal operating conditions. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, ensuring reliability and peace of mind for professional repairs and maintenance.