When the cold season is on or when planning for long periods of downtime, the owner faces the critical challenge of properly preparing the power unit for inactivity. A simple engine without prior preparation often leads to catastrophic consequences, such as deep corrosion of the cylinder-piston group, oxidation of contacts and dissection of the fuel emulsion. Many people mistakenly believe that it is enough to simply silence the engine and cover it with a case, but internal corrosion processes will start in the first weeks of downtime.
Literate engine-preservation It's a set of interventions that are designed to displace moisture, create protective films on rubbing surfaces and stabilize fluids, and ignoring these procedures can reduce the life of the unit by 30-40%, and in the worst case, require major repairs after winter. In this article, we will discuss in detail the preparation stages, the selection of materials and the nuances of storage of various types of motors.
It should be understood that the methods of conservation of gasoline and diesel engines have their own specifications related to differences in the design of fuel equipment and the properties of working fluids. Incorrectly selected preservative or violation of the sequence of actions can cause more harm than good.
Preparation of the power unit for conservation
The first and most important step is to thoroughly wash and clean the engine of dirt, oil and technical chemistry. Pollution left on the surface of the unit can contain aggressive components that can destroy rubber seals or cause corrosion of metal parts during downtime. Use specialized cleaners that do not leave a greasy film, and be sure to blow out hard-to-reach places with compressed air.
After external cleaning, all visible components must be defective; check the condition of the belts, pipes and electrical connectors; cracks on rubber products can expand with temperature changes, and oxidized contacts will lead to problems with starting in the spring. Silicone lubricants They are excellent for processing rubber seals, preventing them from drying out.
⚠️ Attention: It is strictly forbidden to wash a hot engine with cold water or to apply a high-pressure jet directly to electrical connectors and a generator. A sharp temperature drop can cause microcracks in the metal, and moisture inside the contacts will become a hotbed of corrosion.
An important aspect of preparation is to replace the engine oil: the waste oil contains combustion products, acid compounds and metal shavings that will actively destroy the internal surfaces of the engine during parking. Fresh oil contains a package of additives that neutralize the acid and create a protective film.
Treatment of the cylinder-piston group
The most vulnerable assembly in long-term storage is the cylinder piston group (CPG), where condensation and acid residues are most commonly corroded. To protect the body, you need to create an oil mist inside the cylinders that will cover the walls, pistons and valves with a thin but strong layer of preservative.
There are several proven treatment methods, and the most effective is using aerosol preservatives specifically designed for internal combustion engines, which are highly adhesive and do not drain down to form a uniform coating, and you can use a mixture of engine oil and a special anti-corrosion compound in the proportion specified by the manufacturer of the product.
The procedure is performed as follows: the spark plugs (or nozzles) are twisted, and 10-20 ml of preservative is injected into each cylinder. After that, you need to turn the crankshaft with a starter several times (without ignition) so that the composition is evenly distributed along the walls. The candles are twisted back, but not tightened to the end to create a buffer air cushion.
Can I use regular motor oil for preservation?
Conventional motor oil does not have sufficient anti-corrosion properties for long-term storage; it has the property of oxidizing and losing viscosity; for CPG preservation, it is better to use specialized sprays on a paraffin basis or mixtures with a high content of anti-corrosion additives that do not dry out for years.
Special attention should be paid to valves of HRM. When the valves are closed, the rods remain unprotected, so it is recommended to turn the engine until the valves are fully open, treat them, and then turn further to lubricate the back of the plate, this will provide full protection of the gas distribution mechanism.
Fuel system conservation
The fuel system of a modern engine is a highly precise mechanism sensitive to fuel quality and moisture. During long-term storage, gasoline and diesel lose their properties: light fractions evaporate, and heavy fractions fall into precipitation, forming resinous deposits. In addition, modern bioethanol in gasoline is hygroscopic and actively (absorbs) water from the air, causing the mixture to dissect.
There are two main strategies for preserving the fuel system: complete emptying or full refueling with the addition of a stabilizer. The first method is suitable for very long storage (more than 6 months), but requires careful purging of all highways to prevent moisture. The second method is more common: the tank is filled to the brim (minimizing space for air and condensate), added. fuel-stabilizerThe engine runs for a few minutes to get the mixture through the system.
For carburetor engines, it is important to cut off the fuel supply to the carburetor itself. Often, the float chamber is filled with gasoline, which, when dried, becomes a sticky substance that clogs the jellyplants. It is recommended to develop fuel from the float chamber before the engine stops completely or use a special feed-off crane.
☑️ Checklist of fuel system conservation
Diesel systems require a special approach because of the risk of paraffin and microorganisms ("diesel bacteria"). The use of biocidal additives and antigels is mandatory even when stored in a warm room, since condensate can appear inside the tank when temperatures vary.
Protection of cooling and exhaust systems
The cooling system is also susceptible to corrosion, especially if it uses ordinary water or old antifreeze, which has lost its properties. Before storage, you need to check the density of the coolant. If the antifreeze has exhausted its life, it should be replaced. In water-cooled engines (especially outboard motors), it is important to completely drain the water if storage occurs at negative temperatures, to avoid breaking the block with ice.
For outboard motors, it is critical to wash the cooling system with fresh water after the season to remove salt residues. After washing, it is recommended to blow the system with compressed air or use a special spray preservative for the cooling system that will protect the channels of the unit from the inside.
The exhaust system is where the most moisture condenses. Water often accumulates in the muffler, which causes rapid corrosion from the inside out. To prevent this, after the last trip or during preparation, the muffler should be dismantled (if possible) or removed from the system to let the water drain, and treat the internal cavities with a heat-resistant preservative.
| Type of engine | Key risk in storage | Recommended preservative | Frequency of verification |
|---|---|---|---|
| Petrol four-stroke | Valve sticking, fuel oxidation | Spray for CPG, gasoline stabilizer | Every 2 months |
| Diesel | Corrosion of TNVD, parafinization | Diesel angel, rust inhibitor | Once a month |
| two-stroke (boat) | Corrosion of crankshaft bearings | Fog spray for crank camera | Once in 3 months |
| rotary | Apex (sealing) rearing | Specialized oil of high viscosity | Monthly |
Store the removed batteries only in a charged state at a temperature not higher than +10 ° C. Once a month, conduct a charge-discharge control and training cycle to avoid sulfation of the plates.
Selection of storage location and conditions
A properly selected storage location can significantly extend the life of the engine even without complex preservation, and the ideal is a dry, heated room with constant temperature and good ventilation, but these conditions are not always available, so you often have to choose from a lesser evil.
When stored in an unheated garage or under a canopy, the main danger is temperature changes that cause condensation ("dew point"). When the metal cools faster than air, moisture acts on its surface. To minimize this effect, the engine and machinery should be covered with breathable materials that allow moisture vapor to pass through, but retain water from the outside.
Using plastic film to cover the engine is a common mistake. Under the film, a greenhouse effect is created: moisture does not evaporate, but condenses on the metal, causing instant rust. It is better to use special covers made of spunbond or dense fabric with water-repellent impregnation.
⚠️ Attention: Do not place the engine in close proximity to open fire sources or heating appliances. Even a mothballed engine contains residues of fuel and oil, the vapors of which can be explosive at a certain concentration.
If the engine is stored separately from the machinery (e.g., removed from a boat or motorcycle), install it on a wooden stand to avoid contact with cold concrete floor. Cement pulls cold and moisture, which will lead to local hypothermia of the bottom of the crankcase and increased condensation inside.
Reconservation and first launch
Spring reconstitution is as important as winter preparation, you can't just take off your case and pull the starter, you need to do a visual inspection for traces of rodents that may have chewed on wiring or nested in an air filter, check the level of all fluids and the status of the battery terminals.
Before starting, it is recommended to twist the spark plugs and check again for oil in the cylinders. If the preservative has been applied in excess, the engine can "suffocate" or squeeze out the glands at the first compression stroke.
Starting after a long downtime is better done with a new spark plug and a fully charged battery. After starting, let the engine warm up at idle speeds without loading it. Listen carefully to extraneous noises: knocking, thorns or whistles may indicate problems that have occurred during downtime.
Successful reconstitution depends on the quality of the pre-conditioning, and if all the steps were performed correctly, the first start will pass without problems, and the engine life will not be affected.
After warming up, inspect the engine for leaks. The thermal expansion of the metal could reveal microcracks in the pipes or weakening of the clamps that were invisible in the cold state. Add antifreeze and oil to the level if necessary.
Frequently Asked Questions (FAQ)
Do I need to start the engine in winter during storage?
Starting the engine briefly in winter without heating up properly (to operating temperature) does more harm than good. An unheated engine builds up condensation in the oil and silencer that doesn't evaporate. It speeds up corrosion. If you can't heat up the machinery to operating temperature and drive it, it's best not to start it up until spring, provided it's preserved properly.
Which oil is better to fill before storage: old or new?
Definitely new. Used oil contains oxidation products, acids and metal shavings that will actively corrode the inner surfaces of the engine during idle time. Fresh oil contains fresh additives that protect the metal from corrosion. Change the oil immediately before storage while the engine is warm.
Can WD-40 be used to preserve cylinders?
Using conventional WD-40 for long-term cylinder preservation is not recommended. It has good water-repellent properties, but it evaporates and dries quickly without leaving the necessary oily film. For CNG, there are special aerosols (Fogging Oil) that create a sticky, long-playing layer that does not flow from the walls.
What to do if the engine is stored on the street?
Storing the engine outside is a last resort, and in this case it is critical to use a sealed but breathable case. Be sure to lift the machinery above the ground. The fuel tank should be filled completely with the maximum amount of stabilizer. The oil in the crankcase should be just above the level, so that the oil vapors better protect the parts from moist air.