Sierra 118-0297 Lower Unit Oil Seal for Mercury/Mariner Outboards

The Sierra 118-0297 is a precision-engineered lower unit oil seal designed as a direct replacement for Mercury and Mariner outboard engines. This seal directly replaces OEM Mercury part number 26-82234M and is also cross-referenced with Yamaha 93101-23070-00, making it a versatile solution for common outboard drivetrain maintenance.

Engineered by Sierra — a SeaStar Solutions brand — this oil seal is built to meet or exceed original equipment manufacturer (OEM) specifications. It features a rigid circular metal exterior bonded to a flexible interior sealing member, forming a reliable barrier that protects shafts and bearings from water intrusion, dirt, and foreign debris while preventing gear lube from escaping the lower unit.

Key Features:

• Replaces OEM Mercury/Mariner part 26-82234M
• Cross-references: Yamaha 93101-23070-00, 47-0297, AP2039, 9-76413, 30999872975
• Shaft diameter: 0.906 in.
• Outer diameter: 1.457 in.
• Width: 0.236 in.
• Meets or exceeds OEM fit, form, and function
• Backed by the SeaStar Solutions Two-Year Warranty

Sierra marine engine parts are trusted by boaters and marine technicians worldwide for their proven quality and reliability. This seal is an essential component during lower unit service and gear lube changes on Mercury and Mariner outboard motors.