Storage; Storage Preparation; Protecting Internal Engine Components; Protecting External Outboard Components - Mercury 150 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).
Never start or operate your outboard (even momentarily) without water circulating through all the
cooling water intake holes in the gearcase to prevent damage to the water pump (running dry) or
overheating of the engine.
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.
Fill the fuel tank and engine fuel system with treated (stabilized) fuel to help prevent formation of varnish
and gum. Proceed with following instructions.
• Portable Fuel Tank - Pour the required amount of gasoline 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 gasoline stabilizer (follow
instructions on container) into a separate container and mix with approximately one quart (one
liter) of gasoline. Pour this mixture into fuel tank.
• Place the outboard in water or connect flushing attachment for circulating cooling water. Run the
engine for ten minutes to fill the engine fuel system.
Flushing Device

Protecting Internal Engine Components

NOTE: Make sure the fuel system has been prepared for storage. Refer to Fuel System, preceeding.
1. Remove the spark plugs and add approximately 30 ml (1 oz.)of engine oil into each spark plug
hole. Rotate the flywheel manually several times to distribute the oil in the cylinders. Reinstall
spark plugs.
2. Remove the water separating fuel filter and empty contents in a suitable container. Refer to
Maintenance section for removal and installation of filter. Replace fuel filter annually, every 100
hours of operation, or if large amount of fuel contamination is present.

Protecting External Outboard Components

• Lubricate all outboard components listed in Maintenance - Inspection and Maintenance
Schedule.
• Touch up any paint nicks. See your dealer for touch-up paint.

STORAGE

CAUTION
!
9192
47
91-44357Q 2
Attaches to the water intakes; provides a
fresh water connection when flushing the
cooling system or operating the engine.