National 710604 Engine Crankshaft Seal - Front

National 710604 Front Crankshaft Seal

National 710604 is a front engine crankshaft seal built for sealing performance in select GM applications. It uses a fluoro-elastomer construction and a clockwise-spiral lip design to help maintain a tight seal at the crankshaft while supporting consistent oil control.

Key Features

• Part number 710604 engine crankshaft seal
• Front position oil seal for the crankshaft
• Fluoro-elastomer material for sealing durability
• Clockwise-spiral lip design
• Inside diameter: 2.058 in. / 52.280 mm
• Outside diameter: 2.628 in. / 66.740 mm
• Width: 0.311 in. / 7.900 mm
• Housing bore: 2.622 in. / 66.610 mm

Detailed Description

National 710604 is an oil seal for the front of the engine crankshaft, sized to match the listed shaft and housing dimensions. The fluoro-elastomer sealing material is selected for demanding engine environments, while the spiral lip profile is engineered to support controlled sealing at the rotating shaft surface. This part is a direct-fit style replacement for select Buick Lucerne, Cadillac DTS, Cadillac STS, Cadillac SRX, and Cadillac XLR front applications. This part cross-references GM OE-style numbers such as 12568023 and 12576050 for the same application.

What This Part Helps Address

• Front crankshaft oil leakage
• Oil seepage at the crankshaft snout
• Contamination around the front engine seal area
• Loss of sealing integrity from worn seal material
• Service replacement for front engine seal wear

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 proper sealing performance. Clean the sealing surface and surrounding bore thoroughly, and inspect the crankshaft surface for wear or scoring before fitting the new seal. Confirm vehicle application by year, make, model, and front position before service.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop designs for modern vehicle service needs. National 710604 is built to the dimensional and material specifications listed above for use in the confirmed front crankshaft seal applications.