Also, if you dry-start frequently for short periods it can melt down your impeller quickly. Many, if not most, of our customers here in Brisbane operate regularly in such conditions. What type of water has your engine been in? You can expect your impeller to wear much faster in muddy, sandy and saltwater conditions, and less in freshwater. If you store your boat over the cold winter months, before you get back on the water be sure to get it serviced – don’t risk it. Conversely, your impeller will wear faster if left for many months without use, and the blades can deteriorate and can even become stuck and break off when the engine starts up. How many years between impeller replacement? Has the engine been stored or garaged for an extended period? As a recreational boat owner, 200 hours may seem like a long time, so why should you worry about it? Due to the nature of the stiff rubber used and the tight fit inside the water pump, your impeller lasts longer when used regularly. If you extend its use beyond what is recommended, cracks at the roots of the vanes will appear and you risk the vanes breaking off inside the cooling system. Over time, the vanes become rigid and work less effectively, and you may see your engine overheating. How many hours your engine has operated between impeller replacement? At a minimum, you should replace your impeller according to your manual – for example, every 200 hours. Here is a great video that shows how a water pump uses an impeller to operate: The impeller is a core component of how a water pump moves water around the cooling system. If in doubt, it is relatively inexpensive to replace your impeller yearly as part of your scheduled boat servicing. What type of water has your engine been in?.How many months/years have passed between your impeller replacement, and has the engine been stored or garaged for an extended period?.How many hours your engine has operated between impeller replacement?.In short, as a boat owner you should be aware of: To help avoid a critical failure like this from ever happening to you, this article covers essential knowledge every boat owner should know about this crucial device. If your impeller fails, the water pump cannot pull in water, and your engine will overheat – and potentially leave you stranded far from shore, adrift with no power. At the heart of your water pump is a small rubber device called an impeller. The water pump pulls water from outside the engine, sends it over the power and cylinder heads, and then ejects it outside the engine block. Replace the casing that you removed and replace any motor covers that you took off in order to accommodate your task.Ī well-working water pump will help to keep your outboard motor running cool and help to keep it operational for a longer period of time.Your boat’s engine has a cooling system, powered by a water pump, which it needs to operate. Step 6 - ReplaceĬlean up the rest of the motor. Attach the bolts into their original positions and tighten securely with your socket wrench. Once it's on, replace any covers that you took off in order to remove it. Just like in removal, it may take a bit of force to get it back on. Get the pump back into its original position on your motor shaft. Step 5 - Place the Pump and Replace Casing Replacing the impeller is just as simple as placing the new one on where the old one came off. In the case of rust or rot, you should replace rather than try to clean it. Use the same cleaner to see if you can get the build up off. In many cases, you will be able to just clean up the impeller. If you are not sure what you're looking for, compare the parts to the replacement part that you purchased. It is a small little propeller-like device. A small, soft-bristled brush will also help you to get the stubborn stuff off. Use the opportunity to use a calcium, lime, and rust remover to clean up the area. There may be a bit of corrosion or water build up around this area. You will need to use a bit of force to get the pump off of the motor. They may look exactly the same, but over time there are minute differences that allow the pump to be attached correctly. It's important that you note which hole had which bolt. There are four to six bolts that attach the pump to the drive shaft of the motor. You will need to remove the motor's protective casing in order to locate the water pump. It is usually at the lower end of the motor near where the propeller is attached. You will need to locate the water pump in order to find the impeller.
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