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Muriatic acid or vinegar

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  • #16
    My outboard, 94 V6, was only used in Fresh water and was over heating on and off for 6 months. I did manually clean the water jackets on top of the heads, that was easy. Then I monitored the heads with a laser as we were running it in the tank w the Vinegar. The Port problem Head went from 180 plus to 130 after a day in the tank. I would recommend this as a try before you go to another expensive treatment. The white calcium like stuff was floating in the tank after two minutes. I spent $600 on parts/ Labor before this I might add.

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