![]() ![]() These pieces of information can save a lot of research time and potentially avoid some catastrophic problems. Also, keep the engine model and/or serial numbers handy. Learn the brand of your engine, along with year of manufacture and engine size. One of the most important steps you can take when replacing your impeller is to know the engine application. While these differences may seem inconsequential, they can actually result in big problems for your engine if you use the wrong one. Many impellers may look similar, but have small, almost-imperceptible differences in dimensions. Knowing how to identify your impeller and identify its replacement can be challenging. However, there are hundreds of impellers of various shapes, sizes and applications available on the market. If you observe that your impeller has sustained significant wear or damage, then you should replace it. Another possible defect is when the metal hub of the impeller detaches from the rubber, causing a situation where the hub is spinning but the rubber vanes are not turning and not pumping water. ![]() Additionally, impellers can swell, crack or bend, which can affect the ability of the pump to cool the engine. It is not uncommon for the impeller vanes to tear or break off, causing potential blockage in the cooling system and a loss of water pressure. You should inspect the impeller at least once a year. Since it is always in use when the engine is running, the impeller suffers a lot of wear and tear. The impeller is a flexible rubber gear that creates the vacuum needed to pump water into your engine for cooling. Whether you are fixing a worn-out inboard engine water pump, rebuilding your stern drive or performing routine maintenance on your outboard motor, you'll likely be replacing an impeller as part of the job. One of the most common items you'll replace on your boat is the water pump impeller. Mercury Pumps & Impeller Kits from Sierra.Our team of boat technicians has the skills and experience needed to service your boat. Staying on top of this boat service can save you thousands of dollars down the road. Let Matson Auto and Marine replace your impeller MerCruiser impellers should be replaced every three years. The design of these units extends the life of impellers. The one exception to this rule would be MerCruiser systems. It can take a long time to clock 100 hours, so we also recommend that the impeller is replaced every other year for the majority of outboards and sterndrives. Depending on how much you use your boat, impeller replacement should be done based on either hour of operation or years.Īt Matson Point S, we recommend an impeller replacement every 100 hours of operation. How often should a boat impeller be changed?Įven if no abnormal damage is caused to the impeller, it should still be replaced on a regular schedule. Severe damage may require an engine replacement. When an engine overheats, damage to the head gasket, cylinders, and the engine block is possible. Without a constant supply of cold water, the engine will quickly overheat. If the impeller on your boat breaks or fails, the resulting damage can destroy your engine. If you use your boat infrequently, or if it has been sitting for a few years, the impeller may have become brittle enough to fail on initial startup. ![]() Rubber becomes brittle and dry rotted if it is sits for too long. If your boat runs for even a few minutes (or even seconds) without water flowing through the impeller, it will shred and need to be replaced. Rubber impellers rely on water to keep them lubricated. Sand particles are abrasive and can quickly wear out the rubber veins of the impeller. If the body of water you take your boat out on is especially muddy or sandy, the life of your impeller can be reduced. There are a few factors that can speed up impeller failure. Like any moving component, rubber impellers will wear out after years of use. Regular seasonal inspections and replacements can prevent major headaches and expenses down the road. Without the impeller, your boat’s engine will overheat.Īs a boat owner, it’s important to pay attention to the condition of your impeller. That being said, the potential engine damage from a failed impeller is substantial. During operation, water keeps them lubricated and prevents damage. ![]() When the impeller rotates, water is sucked into the cooling system.ĭespite being made of rubber, impellers tend to be durable. An impeller is a hub with flexible rubber fins. Boats use impellers to take in raw water. Cold water cycling through the system keeps the engine at a safe operating temperature. Most inboard and sterndrive boats utilize a raw water system to cool the engine while it runs. ![]()
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