Yamaha - Impeller Housing - Water Pump Component - 6R7-51312-03-00

Overview

When you’re servicing a Yamaha water pump, it’s easy to focus on the impeller and overlook the housing—but that’s where a lot of problems start. I’ve seen fresh impellers installed into worn housings, and the cooling performance still wasn’t right. The Yamaha Impeller Housing 6R7-51312-03-00 gives the impeller the proper surface and clearance to move water efficiently. If the housing is worn, the whole cooling system suffers, so it’s worth getting it right.

Key Features

• Optimized Water Pump Chamber – Provides the correct internal shape for efficient water movement through the cooling system.

• Yamaha Engineered Fit – Designed to match original specifications for proper alignment with pump components.

• Wear-Resistant Interior Surface – Built to handle constant impeller contact without excessive scoring.

• Supports Consistent Cooling Performance – Helps maintain steady water flow to protect engine temperature.

• Direct Replacement Design – Fits in place of the original housing during standard water pump service.

Engine & Boat Compatibility

The Yamaha Impeller Housing 6R7-51312-03-00 is designed for Yamaha outboard engines equipped with a lower unit water pump system.

It is commonly used during water pump maintenance when replacing worn or damaged housings that can affect cooling efficiency. Always confirm compatibility using your engine model and parts diagram before installation.

FAQ

Q: How can I tell if my impeller housing is worn out?
A: Look for grooves, scoring, or uneven surfaces inside the housing—those are clear signs it needs replacement.

Q: Can I install a new impeller without replacing the housing?
A: You can, but if the housing is worn, it can reduce the effectiveness of the new impeller.

Q: How often should this part be checked?
A: It should be inspected every time you service the water pump or replace the impeller.

Q: Does running in sandy or dirty water affect the housing?
A: Yes, debris can accelerate wear inside the housing and shorten its lifespan.

Q: Should I replace other parts at the same time?
A: It’s best to check or replace the impeller, wear plate, and seals during the same service.