boat engine impeller
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- November 12, 2019
One of the most common items you'll replace on your boat is the water pump impeller. Whether you are fixing a worn-out inboard engine water pump, rebuilding your stern drive or performing routine maintenance on your outboard motor, you'll likely be replacing an impeller as part of the job.
What is the Impeller, Exactly?
The impeller is a flexible rubber gear that creates the vacuum needed to pump water into your engine for cooling. Since it is always in use when the engine is running, the impeller suffers a lot of wear and tear. You should inspect the impeller at least once a year. It is not uncommon for the impeller vanes to tear or break off, causing potential blockage in the cooling system and a loss of water pressure. Additionally, impellers can swell, crack or bend, which can affect the ability of the pump to cool the engine. Another possible defect is when the metal hub of the impeller detaches from the rubber, causing a situation where the hub is spinning but the
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