Sierra 18-1211 Rear Main Seal for Marine Engines

The Sierra 18-1211 is a high-quality rear main seal designed for marine engine applications. This precision-engineered seal installs at the rear of the crankshaft to prevent oil leakage between the engine block and transmission housing, ensuring proper lubrication system integrity and preventing environmental contamination.

Key Features:

• Premium marine-grade construction resists saltwater, heat, and chemical degradation
• Precision-molded design ensures proper fitment and reliable sealing
• Prevents crankshaft oil leakage at the flywheel interface
• Direct replacement for OEM specifications
• Manufactured to meet or exceed original equipment standards

Sierra Marine is known for producing reliable aftermarket parts that deliver OEM-quality performance at competitive prices. This rear main seal is an essential component for engine rebuilds, preventive maintenance, or addressing oil leak issues. Proper installation with appropriate sealants and torque specifications is recommended for optimal performance and longevity.