National 710818 Manual Transmission Output Shaft Seal

Overview of National 710818 Manual Transmission Output Shaft Seal

The National 710818 manual transmission output shaft seal is engineered to provide reliable sealing performance for select Kia and Mazda vehicles. Designed with precision, this polyacrylate oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Material: Durable polyacrylate for effective sealing
• Inside Diameter: 1.378 inches (35.000 mm)
• Outside Diameter: 1.898 inches (48.200 mm)
• Flanged Outside Diameter: 2.283 inches (58.000 mm)
• Thickness: 0.472 inches (12.000 mm)
• Helix Type: Counter-clockwise spiral lip design for enhanced sealing
• Overall Width with Side Lip: 0.906 inches (23.000 mm)
• Compatible with Kia B2000, B2200, Sportage and Mazda Miata, MX-5 Miata, RX-7 models

Detailed Product Description

The National 710818 output shaft seal is specifically designed for manual transmissions requiring a precise fit and reliable sealing. Constructed from polyacrylate, this oil seal offers resistance to heat and wear, ensuring long-lasting performance. The counter-clockwise spiral lip design improves sealing efficiency by directing fluid back into the transmission housing, reducing the risk of leaks. With an inside diameter of 1.378 inches and an outside diameter of 1.898 inches, this seal fits housing bores measuring approximately 1.890 inches, matching the shaft size of 35 mm. The flanged outside diameter of 2.283 inches provides additional stability during installation and operation.

Applications and Problem Solving

• Prevents manual transmission fluid leaks in Kia B2000 and B2200 models
• Maintains transmission integrity in Mazda Miata and MX-5 Miata vehicles
• Reduces contamination ingress in Mazda RX-7 transmissions
• Addresses wear-related seal failures in Kia Sportage manual transmissions
• Helps avoid costly transmission repairs due to fluid loss

Installation Notes and Tips

• Ensure the transmission output shaft 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
• Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing
• Check shaft surface for wear or damage that could compromise seal performance
• Lubricate the seal lip lightly with transmission fluid prior to installation to reduce initial wear

Quality Assurance and Warranty

National transmission seals, including part number 710818, are manufactured to meet industry standards for durability and fitment accuracy. The polyacrylate material and design features ensure consistent performance under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.