Note the damaged vanes on the impeller. This caused water to pass by and reduce pump out put.
A few weeks ago i noticed that the water flow for the wet exhaust cooling was low, at idle. This is normally the first sign of pump wear. The cause can be a variety of things from a worn impeller to a more serious problem like Pump housing wear or a bearing seal failure. Over time these pumps wear and it is a good practice to have a look at them from time to time. We monitor them when the engine is running every few hours. Check for dripping indicating a leaky seal and check the output by feeling the temp of the hose coming of the pump.
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