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Old 11-18-2018, 06:37 AM   #3
boomerang
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City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird MMSI 367769170
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 498
The fresh water from your engine flush should remain in the engine block, heat exchanger, water pump etc, regardless of if the sea cock is left closed or reopened after flushing. I suppose there's a safety factor of leaving them closed as long as you remember to open them before starting.
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