National 711129 Engine Crankshaft Seal - Front

Engine Crankshaft Seal Overview

National 711129 is an engine crankshaft seal built for front applications on a wide range of GM vehicles. It uses a clockwise-spiral lip design and fluoro-elastomer construction to provide a precise sealing interface in demanding engine environments.

Key Features

• Fluoro-elastomer seal material for resistance to heat and oil exposure
• Clockwise-spiral lip design for controlled sealing action
• Metric dimensions for accurate housing and shaft fitment
• Part number 711129 for direct catalog identification
• Fits 2014-2019 Cadillac CTS, front and other GM front-engine applications

Detailed Description

This National crankshaft seal is engineered as an oil seal for front engine service where consistent sealing around the crankshaft is critical. The 72.0 mm housing bore, 55.0 mm shaft size, and 8.0 mm width support precise installation in the specified applications. Fits 2014-2019 Chevrolet Camaro, front and other listed Cadillac, Chevrolet, and GMC models. Part number 711129 is also cross-referenced to 12634614 for the same application.

National has supplied sealing products for more than 75 years, and the 711100 series reflects that focus on modern sealing design. For buyers searching for a crankshaft seal for Chevrolet Silverado 1500, GMC Sierra 1500, or Chevrolet Corvette front applications, this part provides a cataloged replacement option with defined dimensions and material specification.

Common Issues Addressed

• Oil leakage at the crankshaft seal area
• Contamination from a worn or hardened seal lip
• Loss of sealing performance from heat-aged rubber
• Improper fit from a seal with incorrect dimensions
• Service replacement for front crankshaft sealing wear

Installation Notes

Verify housing bore, shaft diameter, and width before installation. Clean the sealing surface thoroughly and inspect the crankshaft for wear or scoring that could affect seal life. Confirm the vehicle application against the fitment list for the exact model and year before service.

Quality Assurance

National is known for sealing solutions backed by more than 75 years of industry experience. The 711129 is part of the 711100 series and uses a fluoro-elastomer sealing material with a spiral lip design for modern engine sealing requirements.