Storage Preparation; Protecting External Outboard Components - Mercury 300R HD CMS Mechanical Operation And Maintenance Manual

Storage Preparation

The major consideration in preparing your outboard for storage is to protect it
from rust, corrosion, and damage caused by freezing of trapped water.
The following storage procedures should be followed to prepare your outboard
for out of season storage or prolonged storage (two months or longer).
Without sufficient cooling water, the engine, the water pump, and other
components will overheat and suffer damage. Provide a sufficient supply of
water to the water inlets during operation.
FUEL SYSTEM
IMPORTANT: Gasoline containing alcohol (ethanol or methanol) can cause a
formation of acid during storage and can damage the fuel system. If the
gasoline being used contains alcohol, it is advisable to drain as much of the
remaining gasoline as possible from the fuel tank, remote fuel line, and engine
fuel system.
IMPORTANT: This outboard is equipped with a closed fuel system when the
engine is not running. With this closed system, fuel within the engine's fuel
system, other than the fuel tank, will remain stable during normal storage
periods without the addition of fuel treatment stabilizers.
Fill the fuel tank and engine fuel system with treated (stabilized) fuel to help
prevent formation of varnish and gum. Proceed with the following instructions.
• Portable fuel tank ‑ Pour the required amount of Quickstor Fuel Stabilizer
(follow instructions on container) into fuel tank. Tip fuel tank back and
forth to mix stabilizer with the fuel.
• Permanently installed fuel tank ‑ Pour the required amount of Quickstor
Fuel Stabilizer (follow instructions on container) into a separate container
and mix with approximately one liter (one quart) of gasoline. Pour this
mixture into fuel tank.
Tube Ref
Description
No.
Quickstor Fuel
124
Stabilizer

Protecting External Outboard Components

• Touch up any paint nicks. See your dealer for touch‑up paint.
• Spray Quicksilver or Mercury Precision Lubricants Corrosion Guard on
external metal surfaces (except corrosion control anodes).
Tube Ref
Description
No.
Corrosion Guard
120
eng
STORAGE
NOTICE
Where Used
Fuel tank
Where Used
External metal surfaces
81
Part No.
92-8M0047932
Part No.
92-802878 55