Sierra 18-0172 Camshaft Oil Seal for Mercury MerCruiser Marine Engines

The Sierra 118-0172 Marine Oil Seal is a premium-quality camshaft seal designed specifically for Mercury MerCruiser marine engines. This seal mounts in the front cover assembly to provide critical sealing around the camshaft, preventing oil and water from mixing and ensuring reliable engine operation.

Key Specifications:

• Outer Diameter (O.D.): 1.500 inches
• Shaft Size: 0.845 inches
• Width: 0.315 inches
• Application: Water pump/camshaft seal
• Note: Two seals required per application

Fits: Mercury Marine 4-cylinder 3.7L engines (224 cubic inch), MerCruiser 470 models with 165, 170, 180, and 190 HP ratings, serial number 6916779 and up (1983-1987 model years).

OEM Replacement: Directly replaces Mercury MerCruiser part number 26-97530 and Mercury Mariner 10525418.

Sierra is a trusted name in marine aftermarket parts with over 50 years of experience. All Sierra products are engineered to meet or exceed OEM specifications and are built with marine-grade materials to withstand harsh marine environments and resist corrosion.