What is the Boat Winterization Checklist for Inboard Engines in Canada?

For inboard engines in Toronto, Ontario, a comprehensive winterization checklist is essential to prevent freeze damage, which accounts for over 80% of boat damage in Canada. The process involves several critical steps to protect the engine block, heat exchanger, and internal components from temperatures that can drop to -30 degrees Celsius.

Key steps for inboard engine winterization include:

1. Engine Flushing and Antifreeze: Circulate marine antifreeze (specifically non-toxic propylene glycol) through the closed cooling system. This flushes the block and heat exchanger to displace all residual water. Failure to do this properly results in high failure rates for unprotected systems in Canadian climates.

1. Fogging the Engine: Remove the spark plugs and spray fogging oil into the cylinders while cranking the engine briefly. This coats internal parts like pistons and cylinders to prevent rust and corrosion.

1. Fuel System Stabilization: Add a fuel stabilizer to the tank and run the engine briefly to distribute the treated fuel throughout the system. This prevents moisture condensation and the formation of varnish or gum.

1. Water Intake Maintenance: Drain the raw water intake lines and ensure the bilge is pumped out. Add a small amount of antifreeze to the bilge and run the pump to distribute it into any remaining water pockets.

1. Battery Care: Disconnect the battery, clean the terminals with a baking soda solution, and store it in a cool, dry place. Using a trickle charger is recommended to maintain the charge throughout the off-season.