The approach of the cold season poses a critical challenge for every water appliance owner: how to properly mothball an engine so that it starts in the spring. Many beginners mistakenly believe that it is enough to drain the water and put the boat in the garage, but it is during this period that up to 80% of all breakdowns associated with corrosion and oxidation of the fuel system occur. boat-engine preservative becomes the main guarantor of the durability of your power unit, protecting the internal parts from the harmful effects of moisture and residues of gasoline.
The question of where and what preservative to buy often fades into the background before you want to save, but the cost of restoring the engine after hibernation is many times higher than the price of a quality spray canister or additive canisters. Modern chemical compounds can create a protective film on the walls of cylinders, neutralize acid residues of combustion of fuel and prevent valves from sticking together. Ignoring this stage of preparation can lead to the fact that instead of a pleasant opening of navigation, you have to deal with complex repairs of the piston group.
In this article, we will take a closer look at what types of preservatives exist, how they differ from conventional oils and fuel stabilizers, and provide step-by-step instructions for their use. You will learn which components to look for when buying, so as not to harm rubber seals and catalysts, if they are provided by the design of your product. outboard motorSo let's figure out what your engine needs to do to keep it safe for the winter.
Why you need conservation and how it works
The main purpose of winter conservation is to create an inert environment inside the engine, which eliminates the contact of metal parts with oxygen and moisture. During the operation of the motor, microscopic scratches form in the crankcase and cylinders, and combustion products accumulate, which, when condensate is present, turn into aggressive acids. Preserving fluid displaces moisture residues and envelops the surface with a thin layer, preventing electrochemical corrosion.
Protection is particularly critical for two-stroke engines where oil is mixed with fuel. In long-term simple oil can precipitate, forming resinous deposits that clog the carburetor jellies or injector nozzles. Specialized formulations contain active dispersants that prevent fuel fractions from separating and oxidizing. For four-stroke engines, condensation in the oil crankcase is also dangerous, which can lead to oil emulsification and rust on the knee.
⚠️ Warning: Never use pure motor oil or WD-40 as a long-term preservative for cylinders! ordinary oil drains down under gravity in a matter of weeks, leaving the top of the cylinder unprotected, and WD-40 is a water repellent rather than a preservative, and evaporates quickly.
The mechanism of action of quality drugs is based on the principle of adhesion: the preservative molecules firmly adhere to the metal, forming a barrier that is resistant to temperature changes. This is especially important if the boat is stored in an unheated room where sharp humidity jumps are possible. Using specialized chemistry allows you to preserve the factory gaps in friction vapors and ensure easy scrolling of the crankshaft in the spring.
Preservatives: What to choose for your engine
The autochemical market offers a lot of products, and it's easy for the customer to get confused by the abundance of names, and all of the products can be divided into three main groups, each of which solves its own problems. spray-preservative For cylinder-piston group (CPG), these are sold in long-spray tube cylinders and are intended for direct insertion into the engine through a candle hole or carburetor.
The second type is liquid fuel additives (stabilizers), which are poured into the gas tank before the last start of the season, which cleans the fuel system of lacquer deposits and prevents the dissection of gasoline. The third type is external preservation sprays, which protect the outer metal parts, electrical connectors and cables from corrosion.
- 🛢️ Aerosols for CPG: Create a dense oil film on the cylinder mirror, piston and valves, preventing bullies at the first start after winter.
- ⛽ Fuel stabilizers: Prolong the life of gasoline, prevent the formation of resins in the carburetor and fuel hoses.
- 🛡️ Anti-corrosion sprays: Protect external aluminum and steel parts from oxidation in conditions of high humidity.
When choosing a tool, be sure to pay attention to compatibility with the materials of your motor. Some aggressive solvents can damage the rubber diaphragms of the carburetor or the sealing rings of nozzles. Modern four-stroke motors with catalytic converters (if they are used in your model) require special ash-free compounds that do not disable the oxygen sensors.
Can motor oil be used for preservation?
You can only use conventional engine oil to preserve cylinders as a temporary measure if you don't have any specialty tools on hand. But the oil is highly fluid and eventually drains into the crankcase, leaving the top of the cylinder vulnerable. Specialized preservatives contain sticky polymers that are held on vertical walls for months.
Top 5 popular remedies for winter conservation
When choosing which preservative to buy for an outboard motor, you should focus on proven brands specializing in marine chemistry. Market leaders are companies whose products have been certified and tested in real-world use. Below is a table comparing popular products available on sale.
| Brand and Product | Type of base | Volume | Features |
|---|---|---|---|
| Liqui Moly Marine Engine Stop Oil | Synthetic | 0.3 l (aerosol) | Up to 2 years of protection, suitable for all types of engines |
| Yamalube Storage Protect Plus | Mineral with additives | 0.35 l | Recommended for Yamaha engines, contains anti-corrosion additives |
| Mercury Quickstor | Synthetic | 0.35 l | Especially for Mercury, prevents oxidation of fuel |
| Hi-Gear HG5530 | Synthetic | 0.34 l | Universal cleaner and preservative, affordable price |
| Brunton Engine Guard | Mixed | 0.4 l | High adhesion, protection against rust and corrosion |
Products Liqui Moly It is often chosen by owners of expensive four-stroke engines due to its high thermal stability and the absence of harmful fumes. Yamalube and Mercury Quickstor These are original fluids from engine manufacturers that are guaranteed not to harm the brand seals. Hi-GearThey also show good results, but may require more frequent updates of the protection layer in extremely humid climates.
When buying, pay attention to the date of manufacture. The shelf life of preservatives is usually 3-5 years, but the expired product can lose its spraying properties or change the chemical composition. It is also important to check the integrity of the package: the aerosol cylinder should not have dents or rust marks on the valve.
Buy preservatives in specialty stores or from official dealers. In markets and unverified points, there is a high risk of running into a fake that, instead of protecting it, can dissolve rubber elements of the fuel system.
Step by step instructions: how to preserve the engine
Conservation requires consistent operations. Breaking the technology can negate all efforts. Before starting work, make sure the engine is cooled, but still warm (about 40-50 degrees), which will ensure better evaporation of moisture and penetration of the preservative.
First, you have to prepare the fuel system. If you're using a liquid stabilizer, add it to the tank in the proportion indicated on the package, and let the engine run for 5-10 minutes at idle speed, so that the "medication" mixture goes all the way through the highway, gets into the carburetor or injector ramp, then close the fuel crane and release the remaining fuel from the float chamber until the engine stalls.
☑️ Conservation checklist
The next step is to treat the cylinder-piston group. Unscrew the spark plugs. Put the spray preservative tube into the candle hole and press the valve for 3-5 seconds. Make a few turns of the crankshaft with a starter (without screwing candles) so that the oil is distributed across the walls. Repeat the procedure for each cylinder. Roll the candles back in, but don't tighten them to the end, or leave an old candle for wintering.
⚠️ Warning: When scrolling with a candleless starter, be sure to turn off the ignition system (pull out the emergency stop motor cable or turn off the coil terminal) so as not to burn the coil or switch with a spark going into the air!
The final step is to externally treat the engine, wash the engine thoroughly with fresh water, dry and apply corrosion spray to all exposed metal parts, electrical connectors and gas control traction. Remember to lubricate the splints of the paddle shaft with a special lubricant that does not contain molybdenum disulfide, if the instruction to your gearbox requires it.
Common mistakes in preparing for winter
Even experienced water-engineers sometimes make mistakes that can be expensive to repair, one of the most common is to keep a full tank of old gasoline without a stabilizer, and the fuel loses its properties in 3-6 months, becoming a viscous substance that completely clogs the jelly. Fuel conservant This is a must if you do not plan to drain the system completely.
Another mistake is ignoring the cooling system: If there is water left in the cylinder block or pump, it will expand when it freezes and can split the aluminum body or damage the impeller. Always blow the system with compressed air or use antifreeze for engines (not car, but special propylene glycol for marinas), if instructed.
- 🚫 Leaving the motor upright without draining water: Water remains in lower unit and when frozen, it destroys the body.
- 🚫 Use of used oil: It contains acids and metal shavings that will accelerate corrosion when idle.
- 🚫 Tight wrapping with polyethylene: This creates a greenhouse effect and contributes to the condensation of moisture inside the casing.
It's also a mistake to keep the motor assembled with the boat under a stretched awning without air, and the condensation that comes from temperature changes has no outlet and settles on metal, and it's better to keep the motor separately, upright, in a dry room.
The main rule of wintering: dryness, vertical position and the presence of a protective film of a preservative on all working surfaces of the engine.
Where to buy and what to pay attention to when choosing
Buy a high-quality preservative for the outboard motor for the winter can be in specialized water equipment stores, large chain hypermarkets in the department "Auto / Moto" or through trusted Internet sites. When ordering online, carefully study reviews about the seller, as the risk of receiving goods with expired expiration date or damaged packaging is quite high.
When choosing, pay attention to the marking. For two-stroke engines, universal trains are suitable, but for four-stroke electronically controlled ones, it is better to take specialized products marked "EFI Safe" or "Catalyst Compatible". The price of a quality product of 300-400 ml varies in the range, which is fully paid off by the tranquility of the technical condition of the unit.
Don't chase the lowest price. Cheap alternatives can contain solvents that are aggressive to plastic and rubber. The optimal choice for most owners of PVC boats and boats are synthetic aerosol preservatives from well-known brands of the chemical industry. They provide reliable protection and are easily applied even in hard-to-reach places thanks to the long tube of the sprayer.
Can I keep my motor on my balcony in the winter?
Storing the motor on an open balcony is highly undesirable. Even with preservatives, constant temperature changes and direct precipitation or ultraviolet will destroy the external elements, the glands and plastic. If there is no other way out, the motor must be carefully packed in a breathing case and placed in a vertical position, protecting against direct snow and sun.
Do I need to start the engine in winter to warm up?
Absolutely not. Starting the engine in winter without fully operating temperatures and circulating cooling water will lead to condensation inside the engine and acid oxidation of the oil, and if the engine is properly conserved, it does not require any starts until spring.
How much is the preservative layer?
Quality aerosol preservatives like Liqui Moly or Yamalube last 12 to 24 months, but if you plan to store the engine for more than a year, it is recommended to check the oil condition in the spring and, if necessary, repeat the CPG treatment procedure before the first start.
What is the difference between a preservative and a regular oil?
The preservative has increased adhesion (stickyness) and contains special anti-corrosion additives that block oxidation. Conventional motor oil is designed to work at high temperatures and pressures, it is more fluid and is not designed for long static stay on vertical surfaces of the metal.
What if the engine is already rusted inside?
If you find traces of rust on a spring candle inspection, don't try to start the engine right away. Put some penetrating lubricant (like a WD-40 Specialist or equivalent) into the cylinders, leave it for a day, then carefully try to turn the crankshaft. After that, be sure to replace the oil and filters before starting.