24 February, 2010
Raw water impeller
When we were motoring towards Previsa I noticed a change in the tone of the exhaust and looked over the side to find the amount of water coming out of the outlet had reduced substantially.
Some people believe the impeller should be replaced annually. I think this is good but unnecessary. It depends on where you sail. While sailing in Venice there was a lot of sand and mud. This caused the impeller to wear faster. One should have a grill on the through hull and a filter soon after. These will catch larger items but not sand and mud.
How do you know when the impeller has gone?
Listen and watch the raw water exhaust outlet. If you don't notice the raw water the temperature gauge should tell you or a sound alarm will (if you have one).