National 710313 Engine Crankshaft Seal - Front or Rear Outer

National 710313 Engine Crankshaft Seal

National 710313 is an engine crankshaft oil seal built with nitrile sealing material and a clockwise-spiral lip design for controlled sealing at the shaft. With metric dimensions and a 70.200 mm outside diameter, it is specified for front and rear outer applications across select Mazda, Toyota, and Ford vehicles.

Key Features

• Nitrile sealing material for oil-resistant performance
• Clockwise-spiral lip design for directional sealing action
• Metric sizing for accurate housing and shaft fit
• Outside diameter: 70.200 mm; housing bore: 70.000 mm
• Inside diameter: 48.000 mm; shaft size: 48.000 mm
• Width: 12.000 mm for a compact seal profile
• Part number 710313 from National’s 710300 series

Detailed Description

National 710313 is an oil seal for crankshaft sealing applications where precise dimensions and stable lip contact matter. The nitrile sealing material is selected for oil sealing service, while the clockwise-spiral lip design helps manage sealing direction at the shaft surface. This part number 710313 is listed for front and rear outer positions depending on the vehicle application, including Fits 1972-1982 Ford Courier, front; Fits 1979-1984 Mazda B2000, front; Fits 1979-1983 Mazda 626, front; Fits 1986-1987 Mazda B2000, rear outer with 7 in ring gear and Mazda axle; Fits 1987-1993 Mazda B2200, rear outer with 7 in ring gear and Mazda axle; Fits 1982-1986 Toyota Celica, front; and Fits 1983-1988 Toyota Cressida, front. This part cross-references Gates 18971 for the same application.

What It Helps Address

• Engine oil leakage at the crankshaft seal area
• Oil seepage from worn or hardened sealing lips
• Improper sealing from incorrect shaft or housing dimensions
• Noise or contamination caused by degraded seal contact
• Service replacement needs on Mazda B2000, Mazda B2200, Toyota Celica, Toyota Cressida, and Ford Courier applications

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Match the listed position exactly, since National 710313 is used in both front and rear outer locations depending on the vehicle. Inspect the shaft surface for wear, scoring, or corrosion before fitting the new seal, and confirm the seal lip orientation matches the application.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for current and legacy vehicles. Part number 710313 reflects that experience with a metric nitrile design intended for accurate fitment and dependable sealing service.