How to winterize a Mercruiser 3.0

Written by jared curtis
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How to winterize a Mercruiser 3.0
You must winterise your boat to ensure no damage is done during the cold winter months. (speed boat image by sheldon gardner from Fotolia.com)

Before putting your boat away for the winter, you must first winterise the motor. Your Mercruiser 3.0 uses the water in the lake to cool the engine while boating. This water stays inside the engine. Failure to remove the water will cause freezing. As the water freezes, it expands. This will cause the engine block to crack. A cracked block is an expensive repair that can be avoided by spending a small amount of time before winter.

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Things you need

  • Fuel stabiliser
  • Wrench set
  • Out-drive earmuffs
  • Garden hose and water source
  • Fogging oil

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Instructions

  1. 1

    Determine the amount of fuel you have stored in your tank by turning the key to the accessory position. Do not start your engine.

  2. 2

    Pour the proper amount of fuel stabiliser into the fuel tank by referring to the chart on the bottle.

  3. 3

    Remove the drain plug with a 15 mm (9/16 inch) wrench. The drain plug is at the bottom rear of the boat.

  4. 4

    Open the engine compartment and remove the nut that secures the spark arrester to the carburettor with a wrench. The spark arrester is a round metal air filter.

  5. 5

    Attach the garden hose to the out-drive earmuffs. The earmuffs slide onto the out drive directly over the water vents. Make sure the muffs are properly placed and covering each vent.

  6. 6

    Turn the water source on. Allow the air pockets to exit the hose.

  7. 7

    Turn on the blower switch, which is located on the dashboard. Let it run for five minutes.

  8. 8

    Start the engine by turning the key. Let the engine idle for at least 10 minutes to allow the stabilised fuel to reach the carburettor.

  9. 9

    Locate the fuel shutoff switch on the gas line that enters the carburettor. If no switch is present, pinch the fuel line with your hand. Quickly spray fogging oil into the carburettor. Open the flaps and spray directly into the carburettor until the engine dies. This will keep the floats from gumming up during storage.

  10. 10

    Remove the drain plugs on the engine block to release the water with a wrench. Refer to the owner's manual inside the glove box for proper drain plug locations. Allow the water to fully drain from the engine before reinstalling the plugs.

  11. 11

    Lower the out drive by pressing the button on the throttle assembly. Have someone watch the out drive so that it does not hit the ground. This will keep the gears lubricated in the out drive throughout storage.

  12. 12

    If your boat has a battery switch, turn it to the "off" position. If not, disconnect the battery cables from the battery with a wrench.

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