Yamaha - Impeller Duct - Water Pump Flow Component - 6HH-51315-00-00

Overview

When you’re working on Yamaha water pumps, it’s not just the impeller that matters—the duct plays a big role in how water actually moves through the system. I’ve seen setups where everything looked good, but worn or damaged ducting caused weak water flow and higher temps. The Yamaha Impeller Duct 6HH-51315-00-00 helps guide water efficiently through the pump so the engine stays properly cooled. It’s one of those parts that quietly does its job, but when it’s off, you’ll notice it.

Key Features

• Directs Cooling Water Flow – Channels water through the pump system for efficient engine cooling.

• Yamaha Engineered Fit – Designed to align correctly with impeller and housing components.

• Smooth Internal Passage – Helps maintain consistent water movement without restriction.

• Durable Marine Construction – Built to handle constant water exposure, debris, and vibration.

• Essential Pump Component – Supports overall cooling system performance when servicing the water pump.

Engine & Boat Compatibility

The Yamaha Impeller Duct 6HH-51315-00-00 is designed for Yamaha outboard engines equipped with a lower unit water pump system.

It is commonly used during water pump service or rebuilds where proper water flow routing is critical for maintaining engine temperature. Always confirm compatibility using your engine model and parts diagram before installation.

FAQ

Q: What happens if the impeller duct is worn or damaged?
A: It can disrupt water flow, leading to reduced cooling efficiency and possible overheating.

Q: Is this part replaced during every water pump service?
A: Not always, but it should be inspected closely and replaced if there’s any wear or damage.

Q: Can debris affect the duct?
A: Yes, sand or debris can cause wear inside the duct over time, especially in shallow or dirty water.

Q: How do I know if water flow is restricted?
A: A weak telltale stream or rising engine temperature can indicate an issue in the pump system.

Q: Should I replace other components at the same time?
A: It’s a good idea to inspect or replace the impeller, housing, and seals during the same service.