Yamaha - Water Pump Housing | Cooling System Component - F4 - 6BX-44311-00-00

Overview

On small four-stroke Yamahas like the F4, the cooling system doesn’t have much room for error. This water pump housing is what keeps the impeller properly contained and directs water flow through the engine. When it starts to wear or get scored, cooling efficiency drops off fast, and that’s when problems start. Swapping it out during service keeps things running cool and avoids bigger headaches down the line.

Key Features

• Core Cooling Component – Houses the impeller and supports proper water circulation through the engine.
• Maintains Cooling Efficiency – Helps ensure steady water flow to prevent overheating.
• OEM Yamaha Fitment – Built to factory specifications for correct alignment and sealing.
• Durable Construction – Designed to handle heat, wear, and regular marine use.

Engine & Boat Compatibility

• F4 – September 2009 and newer

FAQ

Q: What are signs this water pump housing is worn out?
A: Reduced water flow, weak telltale stream, or signs of overheating are common indicators.

Q: Should I replace this when changing the impeller?
A: It’s a good idea to inspect it closely and replace it if there’s any scoring or wear.

Q: Can a worn housing damage a new impeller?
A: Yes, a rough or uneven surface can shorten the life of the impeller.

Q: Does this part affect engine cooling directly?
A: Yes, it plays a key role in maintaining proper water flow through the system.

Q: Is installation difficult?
A: It’s straightforward if you’re already servicing the water pump and lower unit