silicon grease).Īltough I agree that Vaseline is petroleum based, I doubt it will do much harm. I also used a bit of dielectric grease upon reassembly (i.e. So, my advice is do not worry about the orientation of the impellar vanes during reassembly. The impellar easily and quickly changed directions with not damage to the impellar vanes as they flexed the opposite direction. Once you know where it is, it should take less than 20 minutes to take it apart and put it back together, even for a novice mechanic.įWIW: Just for kicks, I held my raw pump in my hand (just installed new impellar) and then turn the pulley by hand in both directions while watching the impellar. There is no way on earth you could replace the impeller without removing the pulley on this boat. I just twisted it a bit and pushed it back in, no lube or anything. It turned out to be just fine, so I didn't need to replace it. Mine came out with needle nose plyers pretty easily.
Impeller sits right inside there, make sure not to lose the rubber O-ring. I just removed the 4 bolts that held the pulley on, removed the 2 bolts that held the pump on (note which way the pump came off, or your engine will overheat when you put it back together), then removed the 3 bolts that held the pump together. There is a plate with 4 bolts and a pulley that cover it up. There are 2 hoses going into it, about 1 1/4" diameter. If you're sitting in the driver's seat looking back, the water pump is on the lower left, at the front of the engine. My buddy forgot to turn the engine off when we pulled the boat out of the lake and it ran for a minute out of the water before we shut it off, so I thought my impeller might have been killed. I have an 84 Barefoot Nautique with a PCM 454. Our team of boat technicians has the skills and experience needed to service your boat.Hi, thought I'd chime in just for kicks. 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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