This could be a clogged cooling water outlet, or it could be a worn or damaged impeller. You may also notice a reduced outflow stream of water after the motor has reached normal operating temperature. Engine overheating: It is always cause for concern when your engine’s water temperature begins to climb, especially when at low idle.If there are signs of wear, cracked or damaged vanes, or you notice the impeller is dry and brittle, it is time to replace your impeller. Visual inspection: Again, you should inspect your impeller at the start of each season.If failure occurs during use, you could be left stranded in need of a new engine. You should not ignore the warning signs of impeller failure. How do I know if my impeller needs replaced? It is never recommended to run your engine while dry. Running dry – As well as cooling for your engine, water also lubricates the impeller, so running the engine while dry could ruin the impeller pump within just a few seconds.Visual inspection would be important after long periods of non-use/storage. You may also notice a “set” in the blades, which will cause impeller performance to degrade gradually over time. Long term storage – Sitting for long periods of time may cause the impeller vanes to become dry and brittle.You will want to inspect your impeller frequently and replace it every year or every 100 hours if using your boat in particularly sandy water. Water conditions – Sandy or sitly water is abrasive and can cause an impeller to wear out very fast.Other conditions that can shorten the life of your impeller: The flexible rubber vanes of the impeller can wear out for many reasons, including just simple use. What are some causes of impeller failure? Your boat’s motor requires a steady flow of water to keep it cool, so if the impeller fails, your engine will be unable to pump cool water causing it to overheat which in turn can cause permanent damage. Why do you need to replace the impeller on your boat? It is a vital component of the engine’s cooling system. What is an impeller and what does it do?Ī boat impeller is a series of rubber vanes molded around a small round disc that is used to pump cool water from outside the boat through the engine’s raw water cooling plumbing, which keeps the engine cool when running. However, it is suggested to also visually inspect your impeller at the beginning of each season for any signs of wear or damage. How often should the impeller on a boat be replaced? It is recommended that a boat impeller be replaced every two to three years or 300 hours, whichever comes first. Some people say, “if you are inspecting it, you may as well replace it.” This is a simple task that could save you time and money and also prevent a great day on the water from turning into a horrible one. Routine maintenance should include inspection and replacement of your impeller if it is showing signs of wear. White three blade of marine engine for speed boat engineering industrial background
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