National 3893V Engine Crankshaft Seal - Rear

National 3893V Rear Engine Crankshaft Seal

National 3893V is a rear engine crankshaft seal built for Ford truck and van applications that need a precise sealing surface at the crankshaft. It uses fluoro-elastomer material for oil resistance and heat stability, with dimensions that match the specified shaft and housing bore requirements.

Key Features

• Part number: 3893V
• Engine crankshaft seal / oil seal for rear position
• Fluoro-elastomer construction
• Inside diameter: 3.750 in. / 95.250 mm
• Outside diameter: 4.756 in. / 120.800 mm
• Housing bore: 4.750 in. / 120.650 mm
• Width: 0.500 in. / 12.700 mm
• Type 45 seal design
• National 3000 series

Detailed Description

National 3893V is an engine crankshaft oil seal engineered around the listed shaft and housing dimensions for a secure rear seal interface. The fluoro-elastomer sealing material is selected for demanding engine environments where oil exposure and elevated temperatures are common. National has supplied sealing products for decades and continues to apply current design practices to service parts like this one. This part cross-references Dorman - HELP 38649 for the same application.

Compatible With Ford E-350 Econoline, rear; Ford E-350 Econoline Club Wagon, rear; Ford F-250, rear; Ford F-350, rear; Ford E-250 Econoline Club Wagon, rear; and Ford F-150, rear. For Ford E-350 Econoline and Ford F-350 rear crankshaft seal service, National 3893V provides the specified dimensions and material profile for the application.

Common Repair Uses

• Rear main seal oil leakage at the crankshaft
• Oil seepage around the engine rear seal area
• Seal wear from age, heat, or mileage
• Loss of sealing integrity at the crankshaft housing bore
• Service replacement during engine reseal work

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the crankshaft sealing surface and the bore thoroughly, and inspect for grooves or damage that could affect sealing. Install the seal squarely to avoid distortion of the fluoro-elastomer lip, and confirm the rear seal orientation matches the engine application. Use the vehicle-specific service procedure for the Ford E-250 Econoline Club Wagon, Ford F-250, Ford F-350, and related rear crankshaft seal applications.

Quality Assurance

National has a long-standing reputation in sealing systems and continues to develop service parts for current and legacy vehicles. Part number 3893V is built to the listed dimensional specifications for direct-fit service in the confirmed Ford applications.