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OUTBOARD BASICS
Outboard engines are clearly the easiest and least time-consuming of marine engines to winterize. The most common cause of storage-related failure is water left in the engine block to freeze; ice forms, expands and cracks the block. With outboards, that shouldn’t be a problem as all the water drains out of the exhaust outlets and propeller hub as long as the engine is tilted all the way down after running it.
With the worry of a cracked block or manifold out of the way, emphasis centers on three main areas: fuel conditioning; cleaning and then “ pickling†the engine’s innards; and making sure there’s no water in the gearcase lubricant. After running the engine for five to 10 minutes on the boat’s treated fuel, switch to the storage mix tank and run it for another few minutes. Remove the air silencer cover and rapidly inject “engine tuner†(a high-detergent cleaner) into the throats of the carburetors or fuel injection air tubes.
Some engines have ports built into the fuel system and use special “engine tuner†oil cans to connect to these fittings. The cleaner will help “wash†carbon deposits from your outboard’s spark plugs, cylinder heads, piston tops, and piston rings. After squirting a healthy dose in, shut the engine off and let it sit for at least a half-hour (engines that have not had this treatment in awhile need to sit for several hours to let the tuner fluid work on the baked-on carbon deposits). Start the engine up again and resume spraying in the tuner until the can is empty.
Next, spray engine storage “fogging†oil into the same orifices. This coats the insides with a thick film, protecting the bearings and metal surfaces from condensation and rust. The fluid will try to choke the engine, and you’ll see a lot of smoke; that’s OK. You may need to rev the engine slightly to keep it running as you squirt the oil into all the cylinders — just don’t rev it over 1500 rpm in neutral.
After you fog the engine, shut it down — do not run it out of fuel, especially if it’s an oil-injected engine (the oil pump will continue to run, making it hard to start again in spring).
Remove the spark plugs and add a teaspoon of outboard oil (or spray more fogging oil) into each cylinder, then after removing the kill switch to prevent accidental starting, slowly rotate the flywheel to distribute the oil in the cylinders. If this is not possible, “bump†the key a few times (again, with the kill switch disconnected) so the engine turns over once or twice.
Check the tilt fluid and top off if necessary; then tilt the engine down fully and drain the gearcase lubricant. While it drains, check the lube’s color for water (contaminated lube will appear milky) or excessive metal shavings. If the lube is black and smells burnt, and the lower fill plug has large metal shavings on it, take it to the dealer for repair. Tiny metal filings are OK, and indicate normal operation. Fill the unit with fresh lubricant, and replace the fill/vent plug gaskets if they’re torn or broken. Grease all fittings on the engine (usually on the tilt mechanism, swivel bracket, steering tube and cowling latches) with a good waterproof grease.
Spray the entire powerhead and electrical wiring with silicone lubricant, and touch up any missing paint (especially on the gearcase and center section). Replace any zinc anodes that are more than halfway eroded. Finally, give the entire engine a coat of protective wax.
If you’re not going to store the rig in a heated garage, be sure to poke a pipe cleaner or probe into the gearcase water inlets and (if equipped) speedometer pitot to remove any debris that might be trapping water. Cover the propeller exhaust outlet with a plastic bag to keep water (and pests) out. Consider removing the prop if it’s stainless to prevent theft. If the prop is worn or damaged, now is a good time to send it out for repair and reconditioning. Remove the battery, charge it fully and check that the water level is correct. Store it in a cool, dry place.