![]() ![]() Install a liquid sensor/temperature alarm. ![]() Remedy: Do not run pump for more than 20 seconds without liquid. Some or all blades completely missing.Ĭause: Dry running, lack of water in pump. Symptoms: End faces hard and either polished or cracked, like carbon. Little chunks of rubber can migrate into the heat exchanger or the engine and cause overheating damage. If the impeller is in pieces, be sure to get all the bits out and be sure they are all accounted for. The tips of the vanes should be round, not flat, and there should be no cracked vanes or distortion in their shape. When the impeller is out, examine it closely. Some impellers are sealed onto their shafts with o-rings, a few (in some Volvo, Atomic Four and Universal engines) are held on with setscrews. Don’t use a screwdriver to lever it out, as this may score the soft bronze of the pump body and cause leaks. For easiest removal (or where the above tools don’t work) use an Impeller Puller Tool. Take the old impeller out by gripping the hub of the impeller using channel lock or needle-nosed pliers. Remove the three to six end cover screws and take off the cover and gasket. We'll walk you through everything you need to find the right impeller and get it installed.Ĭhecking the impeller is relatively simple. Of course, you should also check the wet exhaust on your transom for the proper flow of cooling water each time you start the engine. That’s why you should carry a spare onboard, since the impeller is one of the vital components of your engine’s cooling system. Just the same, an impeller will eventually fail while in operation, and usually at an inconvenient time. You should check the impeller’s condition during winterization and every 200 hours of operation. Correctly installed, impellers may last for several years, but you should stick to a schedule of preventative instead of emergency maintenance. Unscrew the old impeller, install the new one, and then put back all the components.Inboard and sterndrive engines usually include a flexible impeller type raw water pump. You first need to switch off the power to the pump and uninstall/disconnect its components, including the drain plug, suction hose, shaft guard, casing, and O-ring. A simple impeller failure could lead to bigger engine problems if you ignore the symptoms. The first thing you will notice is an overheating engine. If the impeller of your boat fails, you will face multiple possible issues. What happens if your boat impeller fails? It’s the same if you want to change impeller on mercruiser or West Marine boat. However, boating enthusiasts suggest that the perfect time to replace the impeller is when you use it for 300 hours or 3 years, whichever comes first. You will find various guides online on the timing of replacing your boat’s impeller. When should you replace your boat impeller? Knowing how to check a broken impeller outboard on a Mercury outboard or any engine gives you the advantage of minimizing the cost to replace an impeller on a boat. Raw water pump impeller replacement is critical because this component will give you a headache when it fails. To keep your boating adventure safe, changing impeller regularly is necessary when you notice any physical damage. Why do you need to replace the impeller on your boat?īoat impellers wear out like the tires on your car. These chemicals can react negatively with the impeller material and cause damage. ![]() The common chemicals your boat can pump in are chlorine and sodium hypochlorite. When your boat’s impeller gets in contact with chemicals in the water, there is a tendency that a chemical reaction can occur. Many signs help you tell whether your boat’s impeller needs replacement. How to Tell if Your Boat Impeller Needs to Be Replaced?Īs a boater, you need to know the signs of a bad impeller in outboard to determine whether it requires replacement. The replacement cost with parts included will be from $100 to $300, depending on the service that you visit. You should check the condition of your impeller if you start noticing failure symptoms.Ī regular checkup would help you avoid serious issues.Īnd, you don’t need to wait until you use it for 300 hours or 3 years to replace the impeller. How Often Should Replace the Boat Impeller?Įxperts suggest that a boat impeller should be replaced after 300 hours of use or every three years, whichever comes first.ĭoing this ensures a healthy engine and safe boating.Ī boat impeller failure could lead to bigger engine troubles and expensive maintenance.
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