Mercury MERCRUISER, Service Manual, Page: 67 / 566

IMPORTANT: If the unit is to be stored in the water, the seacock should remain closed until time of usage. If unit is to be
stored out of the water, open the seacock.
21. Open the seacock, if equipped, or reconnect the alternative water inlet source prior to operating the engine.
Cold Weather or Extended Storage
IMPORTANT: Mercury MerCruiser strongly recommends that this service be performed by an authorized Mercury MerCruiser
dealer. Damage caused by freezing temperatures is not covered by the Mercury MerCruiser Limited Warranty.
NOTICE
Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.
NOTE: As a precautionary measure, attach a tag to the key switch or steering wheel of the boat reminding the operator to open
the seacock or unplug and reconnect the water inlet hose before starting the engine.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Ensure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene glycol
manufacturer's recommendations.
Preparing Power Package for Storage—MPI Models
Multipoint fuel injection (MPI) systems must have a special mix of fuel, stabilizer, and lubricant, completely fill the fuel delivery
system. This fuel mix stabilizes the fuel and lubricates the fuel pumps, fuel pressure regulator, fuel injectors and, reduces
internal oxidation of the fuel system metal components.
IMPORTANT: This special fuel mix can be used on Mercury Marine catalyzed gasoline engines.
Special Fuel Mix
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
!
WARNING
Fuel vapors trapped in the engine compartment may be an irritant, cause difficulty breathing, or may ignite resulting in a fire
or explosion. Always ventilate the engine compartment before servicing the power package.
1. Fill a 23 liter (6 US gal) remote fuel tank with 19 L (5 US gal) regular unleaded 87 octane (90 RON) gasoline.
2. Pour into the remote fuel tank 1.89 L (2 US qt) of Premium Plus 2‑Cycle TC‑W3 Outboard Oil and 29.5 ml (1 oz) of
Mercury Quickstor Fuel Stabilizer.
Tube Ref No. Description Where Used Part No.
115
Premium Plus 2-Cycle
TC-W3 Outboard Oil
Fuel system 92-858026K01
124
Quickstor Fuel Stabilizer Fuel system 92-8M0047932
3. Install the remote fuel tank cap and ensure the added ingredients are thoroughly mixed with the fuel.
Engine and Fuel System Preparation
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
Maintenance
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 1C-51