Re: Additional filter in raw water intake for the engine before the heat exchanger
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Good point. There should be two flushing attachment points on the engine, one just after the water pump and one before the exhaust so you can run a flush, with a barnacle slash calcium cleaning solution there are many brands. I recently rigged up a system to do just this. It should be standard on all ocean boats.
It has been a surprise to me how much seaweed and other dirt accumulates in the heat exchanger for the gear box even though there is a strainer at the intake point. Amel recommends that the heat exchanger be cleaned out yearly and it‘s definitely necessary. I checked the manual for my Volvo D3-110 engine and it says the following on page 104: