The raw water impeller is one of the least expensive parts on your boat, and one of the most important. This small rubber wheel pulls sea or lake water through the cooling system. When it hardens, cracks, or loses a vane, cooling flow drops and your engine can overheat within minutes.

How often should you replace it?

As a rule, inspect the impeller every season and replace it every one to two years, or sooner if you run in sandy, silty, or debris-heavy water. Rubber degrades even when the boat sits, so age matters as much as hours.

Signs the impeller is due

  • Reduced water flow from the exhaust telltale.
  • Higher running temperature than normal.
  • Rubber fragments found downstream in the cooling system.
  • The boat has been stored for a long period without service.

Why timing matters

When an impeller fails, it often sheds broken vanes into the cooling system, which can lodge in the heat exchanger and cause further blockage. A planned replacement avoids the overheat, and lets us check for and remove any stray pieces, inspect the wear plate and housing, and fit fresh gaskets.

Do not wait for a hot gauge to remind you. Book our Raw Water Impeller Replacement Service and keep strong, reliable cooling flow all season.