How to Winterize a Boat

As the weather gets colder and boating season ends boat owners begin to consider what to do to winterize a boat. Preparing your boat for storage over the winter is one of the most important pieces of maintenance you will carry out and will ensure that you don't have any problems in the spring. Make sure that you don't forget anything by working through these simple instructions.

Step 1 – Fuel and Oil Fill

To prevent condensation forming in your fuel tank and leading to corrosion, you should store your boat with a full fuel tank. Add fuel stabilizer according to the manufacturers instructions and then fill the tank, leaving only enough room to allow for fuel expansion. Replace the water separator and the fuel and oil filters then run the engine to warm it up and distribute the treated fuel through the system. Change the engine oil while it is still warm to ensure that the impurities in the oil will be removed. Turn off the fuel valves.

Step 2 – Use Flushing Kit

Drain the cooling system and use a flushing kit to remove any sediment or rust that may have accumulated. Once the system has been flushed, you should replace the coolant with propylene glycol antifreeze to prevent ice from forming in the lines.

Step 3 – Remove Spark Plugs

Take out the spark plugs and spray fogging oil into the carburetor and cylinders. This helps to prevent corrosion to the pistons and valves caused by their exposure to air as the oil pools in the bottom of the engine block. Replace the spark plugs without connecting them up then change the gear oil. Take care not to leave any water in any of the components as it will cause engine damage if it freezes.

Step 4 – Check Propeller

Thoroughly inspect the propeller for any chipped or bent blades and arrange to carry out repairs at this time rather than waiting until the start of the boating season.

Step 5 – Clean

Clean the interior and exterior of the boat, thoroughly taking note of any repairs that need to be carried out as you go. Leaving a dirty boat over the winter will make the cleaning much more difficult in the spring and any impurities or stains will become more deep-seated. After cleaning the exterior, seal any exhaust ports with duct tape. Leave all storage areas open to prevent moisture build-up and remove cushions for storage elsewhere. As a further precaution, you may want to install a dehumidifier or moisture absorber. Remove life-jackets or place them somewhere that they will be able to dry out and inspect all other safety equipment. Follow the manufacturers instructions to drain, flush and clean any toilet facilities then add antifreeze unless otherwise recommended.

Step 6 – Place Under Cover

If your boat will be stored out of the water, you should remove the drain plugs after draining and cleaning the bilges. You should also remove the battery and ensure that it is recharged every month. Use a boat cover to protect it from dust, grime and weather damage. If the boat will remain in the water, leave the battery in the boat to allow the bilges to work if required.