If the impeller is not working properly, it won’t pump the water, heating the engine. The impeller pumps that water (see the above video on its working to know more). If that water flow is interrupted by anything (if the water does not flow inside the engine block), it overheats the engine quickly. The boat engines are designed to allow the water to flow over the power & cylinder heads, absorbing that heat to cool the engine. If your engine is overheating frequentlyĮvery engine needs to be cooled down by some means. At 500 hrs, they may look distinctly cracked, but if you are lucky, sometimes impeller vanes can still be intact and work ok. At 300 hrs, they tend to show the origin of cracks at the impeller vane roots at this level of use. So, if you see any significant bent vanes on the impeller, it’s time to replace the impeller.Īt 50 hrs to 100 hrs, they may look OK, with fewer cracks or no cracks at all. The Bent vanes will not vary the pressure inside the impeller’s housing and won’t pump the water, which heats the engine immediately. If those bends are significant, it’s time to change the impeller. But at some point in time, the vanes may lose flexibility, and all the vanes might lean towards one side. But after 50 hrs to 100 hrs of use, they start to bend a little and increases further if you go on. Usually, all the vanes on a brand new impeller will be firm and won’t bend unless you apply any force. Otherwise, you may not find the issue until your engine overheats (and stops) in the middle of the lake or elsewhere. You can only do this if you inspect the impeller frequently, once every month or so. So, by looking at the impeller’s condition, you can decide whether to replace it or not (most of the time). Even the corrosion can be a problem inside the impeller hub inspect the impeller hub simultaneously while changing the impeller and clean it concurrently. You can get a good impeller for your boat for under $50 even on Amazon here. The impeller can’t be repaired like a propeller or any, so you need to buy a new one. You can decide that by just looking at the impeller, if any of the impeller vanes are lightly melted or have cracks in the roots or worn off, it is recommended to replace the impeller. More than anything else, bad visuals tell you more, and you can decide on that factor most times. Physical wear and tear (cracks and vanes meltdown) However, it would be best if you verify those bad symptoms before replacing the impeller. We will now see the symptoms that a bad or damaged boat impeller will show. When to replace boat impeller? 3 Bad symptoms to look for
INBOARD BOAT IMPELLER MANUAL
But if you don’t want to take the risk (of engine failure due to overheating in the middle of the lake), you can replace it yearly or follow the manual and replace it after using it for that many hours.īefore going into the technical essence related to the impeller, take a look at this small video on the impeller working if you aren’t familiar with its working. Even if the boat engine is dry started frequently for short periods as a result, it melts down the impeller quickly.Īs mentioned earlier, you can change it whenever you see impeller vanes start to meltdown, OR cracks or wear on the impeller. It also depends on the number of hours used and above all what kind of water you boat in, i.e., in muddy waters, you can expect the impeller to wear much faster than in freshwaters. You can use the old one during an emergency. Tip – If you are thinking of replacing your boat impeller yearly regardless of its condition, keep the old one as a spare in your boat. It is up to you if it is in good condition, no need to replace it. Since the impeller plays a crucial role in keeping the boat engine cool all the time, many say to replace it yearly regardless of its condition, so that you need not worry about the engine failure due to overheating in the middle of the lake. If none are there, you can use it for some more time. But, as always, inspect it annually (recommended – before every season), look for set in the vanes, tiny cracks in the vane roots, flexibility, and replace on condition. Many people may advise you to replace it yearly for a piece of mind. Yet, many experts suggest yearly replacement as a general rule regardless of its condition, but you can do it whenever you see any visible loss OR do it yearly for peace of mind. Are you using the same impeller for a long time and worried about the impeller condition? Is it OK to use an impeller for extended periods without replacing it? How often should a boat impeller need to be replaced?Ī boat impeller needs to be replaced if its vanes are slightly melted or have cracks in the roots, or worn off.
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