![]() When you suck up anything besides water in your engine, it could damage your impeller. Sucking up sand or mud into your intake.General usage is the main cause of wearing out your boat impeller, but there are some things that wear them out quicker. What causes your boat impeller to wear out Especially marine diesel motors tend to have vastly different recommendations when it comes to stuff like this. However, if you use your boat motor very often, such as on a company boat, you may want to change it once every 150 hours as it may wear down quicker.Īlways make sure what your owner’s manual says on how often you should replace your impeller as not every motor is the same. Impeller hasn’t been replaced in over 300 hoursĪs I’ve mentioned above, most boat manufacturers recommend changing your impeller and impeller casing once every 300 hours or 3 years. Below is an example of a good engine tell-tail:Ī good way to determine a weak stream is to take a picture of it when the engine is running normally, then compare it to what the stream looks like later.Īnother thing that could happen if there is no or low water pressure is your engine will sound hollow and loud. If the stream is weak or non-existent, something is wrong and you need to fix it. The best way to check for water pressure is to just look at your engine tell-tail (engine pee). So before you blame the impeller, make sure you check for clogs. The third most common reason is a damaged impeller. So when checking water pressure, make sure nothing is clogged in your strainer or intake as those 2 are the most common cause of poor engine water pressure. When there’s less water pressure, your engine will run hotter. Reduction in water pressure goes hand to hand with an overheating engine. Reduction in water pressure (reduction in engine pee) Hopefully, it won’t get to that point as it could severely damage your engine. If no warning goes off, your engine will eventually burn oil and start to smoke. If you need to install a temperature reader, check out this video or contact a boat mechanic. Most boats have a temperature gauge to read engine temperature and a warning system that will alert you if your engine is overheating. So, if there isn’t anything clogged in your strainer or intake, your engine is probably overheating due to a bad impeller. One and two are a clogged water strainer and debris stuck in the intake. Engine overheatingĪccording to Sweet Ruca, a failed impeller is the third most common reason for engine overheating. If this is the case, you don’t need to replace the impeller. Note that sometimes a fin may appear curved while it’s sitting inside its casing however, it straitens up when you pull it out. One curved fin on these short fined impellers will cause significantly less water pressure through the cooling system. Because of just that one, I would recommend replacing this impeller. Impeller wear and tearĪlthough most of the fins on the impeller above are straight, notice the curved one on the bottom. Note that there could be other factors affecting your engine stream strength.Ĭontinue reading to get a better understanding of each of these signs. I usually take a picture of how strong of a tell-tail (engine pee) I have when the impeller is brand new so that way I can always compare how it is now to the picture as the impeller ages and the stream gets weaker. Most manufacturers recommend changing your impellers every 300 hours and checking them once a year, but it’s always best to check your exact owner’s manual. Impeller hasn’t been replaced in over 300 hours.So if your engine sounds unusually loud and hollow, it’s probably because there’s no water running through it. Water pressured through your engine by the impeller is used to aid in muffling your engine. If you’re noticing a weeker water stream coming out of your engine, it may be because your impeller is going bad and there is less water being pressured through it. ![]() This goes hand to hand with an overheating engine, but when an engine overheats it could burn oil and cause your engine to smoke. Diesel engines shouldn’t run any hotter than 200☏ (93☌). ![]() 160☏ (71☌) is the hottest gasoline engines should run. ![]() Make sure to check your temperature gauges often if you believe you have a bad impeller. It’s usually pretty obvious to see wear and tear but look for cracks, bends, and melted rubber. Here’s a list of all of the signs that your impeller needs to be replaced. How to tell if your boat impeller needs to be replaced? What happens if your boat impeller fails?.When should you replace your boat impeller?.What causes your boat impeller to wear out.How to tell if your boat impeller needs to be replaced?. ![]()
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