Whether you service in spring or fall , we suggest a service be done every 100hrs or once a year.
Many boating experts recommend replacing the impeller once a year no matter what, as a notable amount of wear can still occur, but not be enough to cause the telltale leak. For example, boats that sit unused for a period of time tend to see problems when the pump is started if the impeller should bond itself to the housing over time (it happens). Impellers can also wear more than you realize when plant growth, plastic bags, or other gunk reduce flow through the water inlet tube, or if a seacock valve is left closed after the engine is started.
Impeller pumps generally fail in one of two ways. The first is a gradual degradation in pump performance and flow as the impeller and housing wear over time. The second type of failure is sudden and catastrophic when the impeller wheel breaks apart, losing some or all its blades. This is frequently caused when the pump runs dry because a blockage has restricted water flow to the pump. Without that flow to cool the impeller pump, it soon overheats to the point of disaster.
When we do a service on inboards /outboards we won't replace anything that doesn't need replacing . We will check & replace as needed the following , if we notice anything we feel you need over and above we will call and get approval first .
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