GHmarine Water Pump Impeller Kit for Mercury Marine 30-125 HP | Sierra 18-3688

GHmarine Water Pump Impeller Kit for Mercury Marine Outboards

Designed for practical maintenance on Mercury Marine 2-stroke and 4-stroke outboards, the GHmarine Water Pump Impeller Kit covers a broad range of engines from 30 HP to 125 HP. This is a comprehensive, all-in-one replacement option that aims to restore reliable cooling performance without the guesswork. The kit is built to align with factory references and is suitable for both seasoned technicians and DIY boaters who value dependable gear during seasonal service or on-the-water troubleshooting.

The kit is thoughtfully assembled to support a smooth replacement process. It brings together a robust combination of components that work in concert to keep your cooling system working as intended. While no single kit can guarantee results in every scenario, many users find that using a complete impeller kit with genuine-compatible parts helps maintain steady water flow and helps reduce the risk of overheating during demanding conditions.

What’s Included

• Water Pump Impeller
• Wear Plate (stainless)
• Drive Key
• Pump Cover
• 4 x Screws
• Housing
• 2 x Seals
• Gaskets

Compatibility and References

• Mercury Marine 2-stroke and 4-stroke outboards from 30 HP to 125 HP
• Mercury part references: 46-8M0113799, 43024A4, 43024A5, 43024A6, 43024A7, 43024A09, 43026T9
• Sierra 18-3688 compatibility

Materials and Durability

The kit combines a stainless wear plate with nylon PA66, plus a non-asbestos tube, neoprene impeller, and gaskets. These materials are selected to withstand marine conditions and provide a durable, long-lasting replacement without compromising fit or function.

Key Benefits and Real-Life Uses

• Comprehensive replacement set designed for Mercury 2-stroke and 4-stroke outboards (30–125 HP).
• Includes essential components to simplify service and minimize downtime.
• Durable materials aim to maintain reliable cooling performance in varied water conditions.
• Suitable for mid-season maintenance, winterization prep, and on-site service checks while on the boat or trailer.

Installation Considerations

Follow standard installation practices for seals and gaskets, ensuring proper alignment and secure mounting. Verify water passages after installation to confirm consistent flow and engine protection. This kit is intended to support straightforward DIY maintenance or professional service workflows.

Why Choose GHmarine

GHmarine offers a practical, all-in-one maintenance option for Mercury outboards. By combining widely compatible references with durable materials, the kit is designed to help you maintain cooling system performance with confidence. Use it as part of a regular maintenance routine to support reliable operation across seasons, while recognizing that results can vary with engine model, usage, and conditions.