National 223750 Engine Crankshaft Seal - Front

Engine Crankshaft Seal for Front Applications

National 223750 is a metric engine crankshaft seal built for front engine sealing applications. It uses a clockwise-spiral lip design and polyacrylate material to help maintain a consistent seal at the crankshaft where oil control is critical. This National crankshaft seal is listed for a wide range of Ford, Mazda, Mitsubishi, Hyundai, Kia, Chrysler, Dodge, and Lincoln vehicles.

Key Features

• Engine crankshaft seal / oil seal for front applications
• Polyacrylate sealing material for durable oil resistance
• Clockwise-spiral lip design for controlled sealing action
• Metric dimensions: 37.000 mm shaft ID, 50.250 mm OD, 6.000 mm width
• Housing bore: 50.000 mm
• National 223750 part number for direct reference
• Cross-references Dorman - HELP 14671 for the same application

Detailed Description

National 223750 is an engine crankshaft seal designed around metric dimensions and a Type 32 profile. The seal measures 1.457 in. inside diameter, 1.978 in. outside diameter, and 0.236 in. thickness, with a 1.969 in. housing bore. Its polyacrylate construction and clockwise-spiral lip design are specified to support oil sealing at the front of the engine, where crankshaft leakage can affect drivability and cleanliness. National has focused on sealing products for decades, and this part reflects that experience in a straightforward OE-style replacement format. It is a strong match for front crankshaft seal service on vehicles such as Ford Escape, Ford Fusion, Mazda 3, Mazda CX-5, and Mitsubishi Eclipse applications. National 223750 is also referenced by multiple interchange numbers across the aftermarket.

What This Part Helps Address

• Front crankshaft oil leakage
• Oil seepage around the crankshaft snout
• Contamination from worn or hardened seal material
• Loss of sealing performance after engine service
• Maintenance on vehicles with front-mounted crankshaft seal service points

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the sealing surface thoroughly and inspect the crankshaft for wear, grooves, or corrosion that could affect seal life. Confirm front-position fitment for your exact vehicle, especially on Ford Ranger, Mazda 6, and Lincoln MKZ applications where engine configurations can vary by year. Proper alignment during installation is important to avoid lip damage and premature leakage.

Quality Assurance

National builds sealing components with long-running industry experience and ongoing design support for modern vehicle applications. Part number 223750 is manufactured as a metric engine crankshaft seal for front use and is cataloged with broad interchange coverage for service matching.