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Saltwater Submersion (Special Instructions)
Due to the corrosive effect of saltwater on internal engine components, complete disassembly of the engine is necessary
before any attempt is made to start the engine.
Fresh Water Submersion (Special Instructions)
1.
Recover the engine as quickly as possible.
2.
Remove cowling.
3.
Flush exterior of outboard with fresh water to remove mud, weeds, etc. Do not attempt to start engine if sand has entered
powerhead. Disassemble powerhead, if necessary, to clean components.
4.
Remove spark plugs and get as much water as possible out of powerhead. Most of the water can be eliminated with
portable engines by placing the engine in a horizontal position (with spark plug holes down) and rotating flywheel.
5.
Change the engine oil. Run the outboard for a short time and check for the presence of water in the oil. If water is present,
the oil will appear milky. Drain and replace the oil as previously mentioned.
6.
Pour alcohol into carburetor throat. Alcohol will absorb water. Again rotate flywheel.
7.
Turn engine over and pour alcohol into spark plug openings and rotate flywheel.
8.
When possible, with the spark plug openings facing down, rotate flywheel while pouring engine oil into throat of carburetor.
9.
Again turn engine over and pour approximately one teaspoon of engine oil into each spark plug opening. Rotate flywheel to
distribute oil in cylinders.
10. Remove and clean carburetor and fuel pump assembly.
11. Dry all wiring and electrical components using compressed air.
12. Disassemble the engine starter motor and dry all the internal parts with compressed air. Be careful not to lose the brush
springs.
13. Reinstall spark plugs, carburetor, and fuel pump.
14. Attempt to start engine, using a fresh fuel source. If engine starts, it should be run for at least one hour to eliminate any
water in engine.
15. If engine fails to start, determine if the cause is fuel, electrical, or mechanical. The engine should be run within 2 hours after
recovery from the water, or serious internal damage will occur. If unable to start engine within 2 hours of recovery,
disassemble the engine and clean all parts. Apply oil as soon as possible.
Fuel Requirements
IMPORTANT: Use of improper gasoline can damage your engine. Engine damage resulting from the use of improper
gasoline is considered misuse of the engine and will not be covered under the limited warranty.
Fuel Ratings
Mercury outboard engines will operate satisfactorily with any major brand of unleaded gasoline that meets the following
specifications:
USA and Canada ‑ A posted pump octane rating of 87 (R+M)/2, minimum, for most models. Premium gasoline 91 (R+M)/2
octane is also acceptable for most models. Do not use leaded gasoline.
Outside USA and Canada ‑ A posted pump octane rating of 91 RON, minimum, for most models. Premium gasoline (95 RON)
is also acceptable for all models. Do not use leaded gasoline.
Using Reformulated (Oxygenated) Gasoline (USA Only)
Reformulated gasoline is required in certain areas of the USA and is acceptable for use in your Mercury Marine engine. The
only oxygenate currently in use in the USA is alcohol (ethanol, methanol, or butanol).
Gasoline Containing Alcohol
Bu16 Butanol Fuel Blends
Fuel blends of up to 16.1% butanol (Bu16) that meet the published Mercury Marine fuel rating requirements are an acceptable
substitute for unleaded gasoline. Contact your boat manufacturer for specific recommendations on your boat's fuel system
components (fuel tanks, fuel lines, and fittings).
Methanol and Ethanol Fuel Blends
IMPORTANT: The fuel system components on your Mercury Marine engine will withstand up to 10% alcohol (methanol or
ethanol) content in the gasoline. Your boat's fuel system may not be capable of withstanding the same percentage of alcohol.
Contact your boat manufacturer for specific recommendations on your boat's fuel system components (fuel tanks, fuel lines,
and fittings).
Be aware that gasoline containing methanol or ethanol may cause increased:
90-8M0105568 eng MARCH 2016
© 2016 Mercury Marine
General Information
Page 1C-13
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