National 710901 Engine Crankshaft Seal - Rear

National 710901 Rear Engine Crankshaft Seal

The National 710901 is a rear engine crankshaft seal built for applications that need dependable oil control at the crankshaft. It uses a PTFE sealing material and a clockwise-spiral lip design to support consistent sealing performance in demanding engine environments.

Compatible With 2003-2010 Ford F-250 Super Duty, rear; 2003-2010 Ford F-350 Super Duty, rear; 2004-2010 Ford E-350 Super Duty, rear; 2004-2005 Ford E-350 Club Wagon, rear; and 2003-2005 Ford Excursion, rear. This National 710901 oil seal is sized for the specified shaft and housing bore dimensions to match the listed rear applications.

Key Features

• PTFE sealing material for crankshaft oil control
• Clockwise-spiral lip design
• Inside diameter: 4.646 in. / 118.008 mm
• Outside diameter: 5.762 in. / 146.355 mm
• Width: 0.750 in. / 19.050 mm
• Housing bore: 5.748 in. / 145.999 mm
• Rear engine crankshaft seal application
• National Series 710900 family

Detailed Description

National has supplied sealing products for more than 75 years, and the 710901 reflects that focus on precision engine sealing. As an oil seal for the rear crankshaft position, it is engineered around the listed dimensions and PTFE construction to help maintain a stable seal where engine oil control is critical. The National 710901 is a direct-fit style option for 2003-2010 Ford F-250 Super Duty, 2003-2010 Ford F-350 Super Duty, 2004-2010 Ford E-350 Super Duty, 2004-2005 Ford E-350 Club Wagon, and 2003-2005 Ford Excursion rear applications.

This part cross-references SKF 46288 for the same application.

What It Helps Address

• Rear main seal oil leakage
• Oil seepage at the crankshaft sealing surface
• Loss of sealing performance from worn or hardened seal material
• Engine oil contamination around the rear of the block
• Service issues tied to incorrect seal dimensions

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal orientation before installation. The clockwise-spiral lip design must be installed in the correct direction for the rear crankshaft position. Clean the sealing surface thoroughly and inspect the crankshaft for wear, scoring, or contamination that could affect seal life. Confirm vehicle application by year, make, model, and rear position before assembly.

Quality Assurance

National is known for sealing solutions backed by long-term industry experience and ongoing product development for modern vehicles. Part number 710901 is built to the listed dimensional specifications for the confirmed Ford rear applications.