National 5066 Engine Crankshaft Seal Kit - Front

Engine Crankshaft Seal Kit for Ford Front Applications

National 5066 is an engine crankshaft seal kit built for front-end sealing service on a wide range of Ford trucks and vans. It uses fluoro-elastomer sealing material and includes a JX1920 wear sleeve to help restore the sealing surface at the crankshaft.

National has supplied sealing solutions for more than 75 years, and this oil seal kit reflects that focus on durable engine sealing for high-mileage service. The National 5066 is a direct-fit option for many Ford E-350, F-250, F-350, and Excursion front crankshaft seal applications.

Key Features

• Engine crankshaft seal kit for front applications
• Fluoro-elastomer material for sealing performance in engine environments
• Includes JX1920 wear sleeve
• Oil seal kit part description
• Outside diameter: 3.505 in. (89.030 mm)
• Shaft size: 2.377 in. (60.380 mm)
• Width: 0.560 in. (14.220 mm)
• Type 48 design

Detailed Description

National 5066 is engineered for front crankshaft sealing service where oil control and shaft surface condition matter. The fluoro-elastomer construction supports resistance to engine heat and fluid exposure, while the included wear sleeve helps address crankshaft wear at the seal contact area. This makes the National 5066 a practical choice for Ford front crankshaft seal replacement on vehicles such as the Ford E-350 Super Duty, Ford Excursion, and Ford F-250 Super Duty.

This part cross-references SKF 18823 for the same application. National 5066 also cross-references Ford F4TZ-6700-A for the same application.

What This Part Helps Address

• Front crankshaft oil leakage
• Oil seepage at the crankshaft sealing surface
• Wear-related sealing issues on the crankshaft snout
• Service needs on high-mileage Ford front engine sealing systems
• Replacement of a damaged or hardened front oil seal

Installation Notes and Tips

Verify shaft diameter, seal width, and outside diameter before installation. Clean the crankshaft sealing area thoroughly and inspect the wear surface before fitting the new seal and sleeve. Confirm front-position application and match the vehicle year, make, and model to the listed fitment before ordering.

• Fits 2003 Ford E-350 Club Wagon, front
• Fits 1999-2003 Ford E-350 Super Duty, front
• Fits 2000-2003 Ford Excursion, front
• Fits 1999-2003 Ford F-250 Super Duty, front
• Fits 1999-2003 Ford F-350 Super Duty, front
• Fits 1983-2002 Ford E-350 Econoline Club Wagon, front
• Fits 1983-1998 Ford E-350 Econoline, front
• Fits 1997 Ford F-250 HD, front
• Fits 1983-1997 Ford F-350, front
• Fits 1983-1996 Ford F-250, front
• Fits 1983-1991 Ford E-250 Econoline Club Wagon, front
• Fits 1984 Ford F-150, front

Quality Assurance

National has a long history in engine sealing and continues to develop sealing solutions for modern vehicle service needs. Part number 5066 is built to meet the dimensional and material requirements listed for the application.