Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Freshwater flushing…
Rick Southard.
I am soon to have a new QSB 6.7 and want to flush it with fresh water whenever possible. Should I change to aluminum anodes instead of zinc? I hear people speak of zinc developing a coating in fresh water and becoming ineffective.
Thanks Rob! That adds some clarity to the problem. Since it is a new engine I will monitor it closely.
With our temperate winter weather I don’t see it being laid up more than a couple of months a year. It will always be in the water but I won’t leave salt water in it.
Zinc is good for brackish water so start there and monitor them. When I pull my zincs after 6 months on the hard sitting with a freshwater/non-tox mix they do have some white build up but that is a different scenario than what yours will be subjected to. Only way to know is to do what you do and monitor over time and see.
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