After a season on the water, your Mercury outboard deserves some care before winter. Salt, silt and other deposits can collect in the cooling system, whether you have been cruising the coast, exploring rivers or heading out to fish.
A freshwater flush can help clear those deposits and protect your engine. Here is what you can do before storage, plus the signs that mean it is time to speak to your local authorised Mercury Marine dealer.
Why Flushing Matters
Your outboard relies on water flowing through its cooling system to help prevent overheating. Over time, salt and debris can build up in the internal water passages, potentially restricting water flow and contributing to corrosion.
A freshwater flush helps wash away unwanted deposits and gives your engine a little extra protection between adventures.
Essential Maintenance: Flushing is particularly important after boating in saltwater, brackish water or muddy and polluted conditions.
Your Flushing Checklist
Give your engine a freshwater rinse
After use in saltwater or other challenging conditions, flush the cooling system with fresh water, following your Mercury owner’s manual. It’s a simple step that helps remove salt and deposits before they cause problems.
Use the correct flushing method
Many Mercury outboards have a dedicated flushing connection, while others require a suitable flushing attachment. Check your manual to find the right method for your engine.
Follow the instructions carefully
Flushing procedures vary between models. Follow the recommended water supply, flushing time and engine-running instructions for yours. Never run an engine without the required water supply.
Check for signs of trouble
Keep an eye out for restricted water flow, unusual signs of corrosion or anything that doesn't look right. If you’re concerned about your engine’s cooling performance, ask your dealer to take a look.
Don't forget winter storage
Before temperatures drop, make sure your engine is prepared for the conditions in which it will be stored. Water left in certain areas can freeze and cause damage, so follow Mercury’s storage instructions carefully.
Leave Winter Worries Behind
Flushing is an important part of looking after your outboard, but it’s only one piece of the winterisation puzzle. A professional check can help identify potential issues before your boat goes into storage.
Your local authorised Mercury Marine dealer can advise on the right maintenance for your engine, check its cooling system and help make sure it’s ready for the colder months.
Flush out the guesswork. Contact your local authorised Mercury Marine dealer for cooling-system advice and winterisation support.
