Yamaha – Water Pump Impeller - Cooling System - F300 F350 - 6AW-44352-00-00

Overview

The impeller is the heart of the outboard cooling system, moving water through the engine to keep temperatures under control. The Yamaha 6AW-44352-00-00 Impeller spins inside the water pump housing, pulling water up from the lower unit and circulating it through the cooling passages. Over time, rubber impellers wear down, lose flexibility, or develop cracks from heat and debris. Replacing the impeller during scheduled maintenance helps maintain strong water flow and keeps high horsepower Yamaha offshore engines operating safely.

Key Features

• Primary Cooling Pump Component – Flexible rubber vanes draw water through the cooling system as the driveshaft rotates.

• Maintains Proper Engine Cooling – Helps ensure steady water circulation to prevent overheating during operation.

• OEM Yamaha Construction – Built to Yamaha specifications for reliable performance and proper fit within the pump housing.

• Routine Service Replacement – Commonly replaced during water pump maintenance to maintain cooling system reliability.

Engine & Boat Compatibility

• F300 - 2007-2009
• F350 - 2007-Current
• FL350 - 2010
• LF300 - 2007-2009
• LF350 - 2007-Current

FAQ

Q: How often should an outboard impeller be replaced?
A: Many Yamaha technicians recommend replacing the impeller every two to three seasons or roughly every two hundred operating hours.

Q: What are signs that an impeller may be worn out?
A: Weak telltale water flow, rising engine temperatures, or overheating warnings can indicate impeller wear.

Q: Can an impeller fail suddenly?
A: Yes. If the rubber becomes brittle or damaged, the vanes can break and reduce water flow quickly.

Q: Does running in sandy water shorten impeller life?
A: It can. Sand and debris passing through the pump can wear down the impeller and internal pump surfaces faster.

Q: Should the full pump kit be installed instead of just the impeller?
A: In many cases technicians inspect the entire pump assembly and replace additional components if wear is present.

• Engine Application
  • F300 - 2007-2009
  • F350 - 2007-Current
  • FL350 - 2010
  • LF300 - 2007-2009
  • LF350 - 2007-Current