How To Winterize A 4 Stroke Mercury Outboard Motor?

How to Winterize a 4 Stroke Mercury Outboard Motor

Winterizing your 4 stroke Mercury outboard motor is an important task that will help protect it from damage and ensure that it starts up properly next season. By following these simple steps, you can winterize your motor in just a few minutes and keep it running smoothly for years to come.

What You’ll Need:

  • Fresh water
  • Mercury outboard motor oil
  • Funnel
  • Wrench
  • Spray bottle
  • Denatured alcohol
  • Shop towel

Step-by-Step Instructions:

1. Remove the spark plugs from the motor.
2. Spray a small amount of denatured alcohol into each spark plug hole.
3. Use a shop towel to wipe away any excess alcohol.
4. Pour fresh water into the motor’s cooling system until it overflows from the overflow drain.
5. Replace the spark plugs.
6. Add Mercury outboard motor oil to the oil fill hole until it reaches the full mark on the dipstick.
7. Turn the key to the “On” position and let the motor run for a few seconds to circulate the oil.
8. Turn the key to the “Off” position and let the motor cool down.
9. Cover the motor with a protective cover.

Step Instructions Image
1 Remove the spark plugs and pour a teaspoon of fogging oil into each cylinder.
2 Turn the engine over by hand a few times to distribute the oil.
3 Reconnect the spark plugs.
4 Fill the fuel tank with a fuel stabilizer.
5 Run the engine for a few minutes to circulate the stabilizer through the fuel system.
6 Disconnect the battery cables.
7 Store the motor in a cool, dry place.

How To Winterize A 4 Stroke Mercury Outboard Motor?

Winterizing your 4 stroke Mercury outboard motor is important to protect it from the harsh conditions of the off-season. By following these steps, you can help ensure that your motor will start up easily and run smoothly next spring.

Drain the Engine

The first step in winterizing your motor is to drain the oil. To do this, locate the drain plug on the bottom of the motor. It is usually a 17mm bolt.

To drain the oil:

1. Remove the drain plug.
2. Allow all of the oil to drain out.
3. Replace the drain plug.

Tip: It is a good idea to replace the oil filter at the same time you drain the oil.

Flush the Cooling System

The next step is to flush the cooling system. This will help to remove any dirt or debris that may have accumulated in the system. To do this, you will need a garden hose.

To flush the cooling system:

1. Connect a garden hose to the water intake on the motor.
2. Turn on the water and allow it to flow through the motor for several minutes.
3. Turn off the water and disconnect the hose.

Tip: Be sure to flush the cooling system with fresh water. Do not use salt water, as this can damage the motor.

Bleed the Air from the Fuel System

The next step is to bleed the air from the fuel system. This will help to prevent the motor from starting up with difficulty next spring. To do this, you will need to follow the instructions in your owner’s manual.

Tip: If you are not sure how to bleed the air from the fuel system, consult your dealer or a qualified marine mechanic.

Add Stabilizer to the Fuel Tank

The final step in winterizing your motor is to add a fuel stabilizer to the fuel tank. This will help to prevent the fuel from going bad over the winter. To do this, follow the instructions on the stabilizer container.

Tip: It is a good idea to add fuel stabilizer to the fuel tank every time you fill up the tank. This will help to protect the fuel from going bad, even if you only use the motor occasionally.

By following these steps, you can help protect your 4 stroke Mercury outboard motor from the harsh conditions of the off-season. By doing so, you can help ensure that your motor will start up easily and run smoothly next spring.

Additional Tips

Here are a few additional tips for winterizing your 4 stroke Mercury outboard motor:

  • Store the motor in a cool, dry place.
  • Cover the motor with a tarp or cover to protect it from the elements.
  • If you live in an area with freezing temperatures, you may want to drain the water from the motor’s lower unit. To do this, follow the instructions in your owner’s manual.
  • Be sure to start the motor and run it for a few minutes before storing it for the winter. This will help to circulate the oil and prevent it from solidifying.

By following these tips, you can help keep your 4 stroke Mercury outboard motor in good condition for years to come.

3. Lubricate the Gearcase

The gearcase is the part of the motor that contains the gears that drive the propeller. It is important to lubricate the gearcase before storing the motor for the winter to prevent rust and corrosion.

To lubricate the gearcase, you will need:

  • A small amount of gearcase grease
  • A grease gun

1. Remove the drain plug from the bottom of the gearcase.
2. Apply a small amount of grease to the gearcase bearings.
3. Rotate the gearcase several times to distribute the grease.
4. Replace the drain plug.

4. Cover the Motor

Once you have lubricated the gearcase, you should cover the motor to protect it from the elements. You can use a commercial motor cover or a tarp. If you are using a tarp, make sure it is large enough to cover the entire motor and that it is secured in place so that it does not blow away.

The best place to store your motor for the winter is in a cool, dry place. If you do not have a garage or shed, you can store the motor in a basement or on a covered porch.

By following these steps, you can winterize your 4-stroke Mercury outboard motor and protect it from rust and corrosion. When you are ready to use the motor again in the spring, simply remove the cover and drain the water from the motor.

Here are some additional tips for winterizing your motor:

  • If you live in an area with extreme cold weather, you may want to drain the oil from the motor and replace it with a winter-grade oil.
  • You should also check the spark plugs and replace them if they are worn or damaged.
  • If you are not going to use the motor for an extended period of time, you may want to start it up once a month and let it run for a few minutes to circulate the oil.

By following these tips, you can keep your 4-stroke Mercury outboard motor in good condition for years to come.

How do I winterize a 4 stroke Mercury outboard motor?

1. Drain the fuel tank. This is the most important step to prevent damage to your engine. To do this, remove the fuel line from the carburetor and allow the fuel to drain into a suitable container.
2. Change the oil. Use a high-quality oil specifically designed for four-stroke outboard motors. Be sure to follow the manufacturer’s instructions for oil capacity and type.
3. Flush the cooling system. This will help to remove any contaminants that may have accumulated in the system during the summer months. To do this, connect a garden hose to the water inlet fitting on the motor and turn on the water. Run the engine for a few minutes to circulate the water through the system.
4. Apply a corrosion inhibitor to the cylinder heads. This will help to protect the metal from rust and corrosion.
5. Cover the motor. This will help to protect it from the elements and prevent dust and dirt from accumulating.

What if I can’t drain the fuel tank?

If you can’t drain the fuel tank, you can try to run the engine until it runs out of fuel. Be sure to do this in a well-ventilated area and away from any open flames.

What if I don’t have a garden hose?

If you don’t have a garden hose, you can use a bucket of water to flush the cooling system. Be sure to use warm water so that it doesn’t damage the seals.

What type of oil should I use?

You should use a high-quality oil specifically designed for four-stroke outboard motors. The oil should have a viscosity of SAE 10W-30 or SAE 10W-40.

How often should I winterize my motor?

You should winterize your motor before storing it for any period of time longer than 30 days.

What if I forget to winterize my motor?

If you forget to winterize your motor, you may experience problems starting it in the spring. You may also need to have the carburetor cleaned or repaired.

Can I winterize my motor with ethanol-free fuel?

Yes, you can winterize your motor with ethanol-free fuel. However, you should still flush the cooling system with fresh water.

What if I have a newer Mercury outboard motor with an oil-injected engine?

Newer Mercury outboard motors with oil-injected engines do not require the oil to be changed as often as older models. However, you should still drain the fuel tank and flush the cooling system before storing the motor for any period of time longer than 30 days.

winterizing your Mercury 4-stroke outboard motor is a relatively simple process that can help protect it from damage caused by freezing temperatures. By following the steps outlined in this article, you can ensure that your motor will be ready to use next season without any problems.

Here are the key takeaways from this article:

  • Drain the water from the motor. This is the most important step to prevent damage from freezing.
  • Lubricate the engine. This will help protect the moving parts from rust.
  • Cover the motor. This will help keep moisture out and protect the engine from the elements.
  • Start the motor and let it run for a few minutes. This will help circulate the oil and lubricate the engine.

By following these steps, you can winterize your Mercury 4-stroke outboard motor and keep it in good condition for years to come.

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