Sierra 18-3924 Marine Piston Ring Set Standard Bore 3.375 for Mercury/Mariner V6

The Sierra 18-3924 is a standard bore piston ring set engineered for Mercury and Mariner V6 outboard motors with a 3.375-inch bore. Designed as a direct replacement for worn or damaged OEM rings, this set restores proper cylinder sealing and compression to keep your outboard running at peak performance.

Key Features:

• Standard (STD) bore size: 3.375 inches — designed for Mercury 2.4L V6 engines with steel cylinder bores
• Chrome face ring construction for enhanced durability and wear resistance in demanding marine environments
• Rings supplied in pairs (2 rings per set)
• Meets or exceeds original equipment specifications for reliable, long-lasting performance
• Engineered to withstand the high horsepower demands and harsh conditions of marine use

OEM Cross-Reference / Interchangeable Part Numbers:

• Mercury Marine: 39-18487A12
• GLM: 14270

Sierra is a trusted name in aftermarket marine engine components, offering premium-quality replacements across thousands of applications. The 18-3924 piston ring set is a reliable, cost-effective solution for Mercury/Mariner V6 outboard engine rebuilds and top-end repairs.