Sierra 118-8307 Lower Main Seal for Johnson Evinrude OMC Outboard Motors

The Sierra 118-8307 is a precision-engineered lower main seal designed specifically for Johnson, Evinrude, and BRP outboard motors. This critical seal component ensures proper sealing of the lower unit main shaft, preventing water intrusion and oil leakage that can compromise engine performance and longevity.

Key Specifications:

• Outside Diameter (O.D.): 1.628 inches
• Shaft Size: 1.110 inches
• Width: 0.448 inches
• Direct OEM replacement for part number 331103
• Also replaces part numbers 777400

Features and Benefits:

• Manufactured to meet or exceed OEM specifications for reliable performance
• Precision-molded construction ensures proper fit and seal integrity
• Durable materials resist saltwater, oil, and temperature extremes
• Essential component for lower unit maintenance and rebuild
• Interchangeable with GLM 86790

This lower main seal is a critical maintenance part for keeping your outboard motor's lower unit properly sealed and protected. Regular inspection and replacement of seals during routine maintenance helps prevent costly repairs and ensures optimal engine performance.