How to Winterize an Outboard Motor?

Boat Max Management |

What to know before getting started ?


  • Winterizing an outboard motor is a critical maintenance procedure that should not be overlooked.
  • If done correctly, it could save you money on spring replacements and extend the life of your engine. This article will take you step by step through the process of winterizing an outboard motor.



Step 1: Preparation - Clean & Gather the Required Supplies

  • 1. First, take the boat out of the water and thoroughly rinse it with fresh water to remove any salt or dirt.
  • 2. Remove the outboard motor from the boat and secure it to a solid surface. Third, gather all of the required materials, such as a fuel stabilizer, fogging oil, gear oil, and a water pump repair kit.

Step 2: Fuel System Stabilization & Optimization 
  • The fuel system is the most critical component of a winterized outboard motor. It is critical to stabilize the fuel to keep it from deteriorating during the winter months.
  • 1. To begin, fill the fuel tank all the way to the top to prevent moisture buildup.
  • 2. Second, add a fuel stabilizer to the tank as directed by the manufacturer.
  • 3. Third, turn on the engine and let it run for a few minutes to ensure that the stabilized fuel circulates throughout the system.

Step 3: Engine Lubrication 
  • To ensure the engine's longevity, it is critical to use high-quality oil and lubricants.
  • 1. First, drain and replace the engine oil with high-quality oil that meets the manufacturer's specifications.
  • 2. Second, fill the air intake with fogging oil and run the engine for a few minutes to circulate the oil throughout the engine.

Step 4: Cooling System
  • During the winter, an outboard motor's cooling system is vulnerable to damage. To avoid damage, the coolant must be drained and replaced.
  • 1. First, remove the lower unit and drain the system's coolant.
  • 2. Second, replace the coolant with a high-quality antifreeze that meets the specifications of the manufacturer.
  • 3. Third, replace the lower unit and tighten the bolts to the manufacturer's specifications.

Step 5: Gearcase
  •  To avoid damage, the gear oil must be drained and replaced.
  • Remove the drain plug and drain the old gear oil first.
  • Second, replace the gear oil with a high-quality oil that meets the specifications of the manufacturer.
  • Third, replace the drain plug and tighten it to the manufacturer's torque specifications.

Step 6: Install a Water Pump
  • The water pump is an important component of an outboard motor that must be maintained properly during the winter months. 
  • 1. Remove the water pump cover first, then inspect the impeller and gaskets for signs of wear or damage.
  • 2.Second, use a water pump repair kit to replace any damaged parts.
  • 3. Third, replace the water pump cover and tighten the bolts to the manufacturer's specifications.

(To ensure the longevity of your motor, always follow the manufacturer's instructions and use high-quality materials.)