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Marine Outboard Engine Flushing

This how-to-video will show the process of flushing your Mercury outboard. It sounds simple, but hang on! There’s a right and a wrong way to perform this essential task.

Flushing an outboard with fresh water is done by a set of “ear muffs” or “flush muffs” fitted around the engine’s gear case to cover the water intakes, connected to a garden hose with a good water supply, and the engine was run for five to 10 minutes. Modern outboards can be flushed using other, sometimes easier methods, without even starting the engine. Check out the video to see the entire flushing process for your Mercury outboard. 

Why Flush?

Salt and brackish water is a corrosive killer of the aluminium from which outboards are made, so flushing every time after saltwater use is a must. Left unchecked inside the cooling passages, saltwater will quickly build up and may cause cooling blockages, leading to overheating and, over time, can corrode an engine from inside out. All outboard manufacturers recommend flushing (according to the procedures outlined in the Mercury engine owner’s manual) after every use in salt, brackish, dirty, or polluted waters. Operating an engine in sandy, silty, or muddy fresh water also dictates the need for periodic flushing.

For more information contact us at North Coast Boating.

Happy and safe boating to all.

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