How to Winterize Volvo Penta Inboard Boat Motors

Updated February 21, 2017

Volvo Penta is a manufacturer of power systems for small motorboards, sailing yachts and commercial cruisers. The Volvo Penta systems engine range from 10 to 800 horsepower. Inboard engines are one common type of motor Volvo Penta makes. Winterising these engines for storage is required to ensure years of top performance. Properly winterising an inboard takes about an hour and requires the help of a friend to complete.

Fill up the tank completely with fuel. This will help keep condensation from building up in the tank and keeping the interior of the fuel tank from corrosion. Add in a fuel stabiliser like Stabil.

Attach a hose to the intake on the side of the engine. Start the motor and run water through the system. If you do not connect the water you may ruin your motor. Running the engine will allow the treated fuel to reach all parts of the system and condition the system with the fuel stabiliser. Let the engine run for 10 or 15 minutes.

Change the oil and oil filter at this time if it is required. Changing the oil and filter is recommended every 100 use hours or at least once a year. Turn the engine off. Suck out the oil through the oil filter tube located under where the dip stick is located. Use a oil filter wrench to remove the filter. Wet the gaskets with clean oil and install new filter. Add new oil into system until the dipstick reads between the minimum and maximum levels.

Remove the water hose from the intake valve. Connect tubing with a funnel at the end where you will run antifreeze through the system. Use a wrench to remove the flame arrester from the carburettor. Lift off the strap and lid. This will allow you to see into the carburettor.

Start up the engine and run the antifreeze through the intake. Get another person to spray fogging oil directly into the carburettor when the antifreeze begins to come out the exhaust. The engine will begin to sputter and will die. If it does not die on it's own, turn off the engine after 15 seconds to avoid damage to the engine.

Spray WD-40 or a similar substance over the starter motor and alternator. Cover any cables and linkages. This will keep condensation from building up and keep corrosion at bay. Avoid getting spray on the belts.

Remove and store the battery. At this time it is not necessary to charge the battery. That can be completed in the weeks leading up to taking the boat out of storage.

Things You'll Need

  • Fuel
  • Antifreeze
  • Hose
  • Tubing
  • Funnel
  • Wrench
  • Fogging Oil
  • Wrenches
  • Oil filter wrench
  • Oil
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About the Author

Michael Carpenter has been writing blogs since 2007. He is a mortgage specialist with over 12 years of experience as well as an expert in financing, credit, budgeting and real estate. Michael holds licenses in both real estate and life and health insurance.