Everyone knows that the car engine requires special care, which will ensure a long and trouble-free life for the motor. The same rule applies to the gas mower engine: depending on whether you have a trimmer or a large four-wheel mower, you will encounter the problem of choosing an oil. So what are the basic requirements for oil for lawn mower engines?
How to choose a lawn mower oil?
As with any machine, there is a manual for the lawn mower, which not only describes the main characteristics of the tool, but also the rules for caring for it. So, in the instructions it will be written that for lawnmowers it is necessary to use only specialized oil. And some manufacturers even insist on using the same brand of oil as the mower itself.
In fact, this fact turns out to be just a marketing ploy of manufacturers, and both automobile and motorcycle engine oil for four-stroke engines can be suitable for a lawn mower. It is enough to simply observe the basic rules:
1. The oil should be mineral or semi-synthetic. A fully synthetic oil can burn the engine, so it is best not to use it at all. During operation of the lawnmower, a lot of sludge is formed on mineral oil, so we advise you to choose semi-synthetic oil. In addition, mineral oil is difficult to find today.
2. The viscosity of the oil must not exceed SAE 30 or 10w30, and the quality category vary between SE and SJ. A more viscous oil can disrupt the engine, however, it also applies to less viscous oil. All these indicators must be indicated on the package.
3. Choose the oil according to the temperature conditions. If you mow in cold weather, the viscosity of the oil may be higher than the above, but the next time you turn it on you will have to replace the oil with the right one.
In lawn mowers with four-stroke engines, oil is poured into a special crankcase and never mixed with gasoline, since the design of such a gas lawn mower does not imply a mix of oil and fuel. On the contrary, it can cause engine damage. It is enough to change the oil once a season, as usually the crankcase holds from 450 to 600 ml of oil. this is enough to handle large areas. However, do not be lazy to check the oil level before each use of the tool.
How is oil used in two-stroke engine lawn mowers?
As a rule, a two-stroke engine is mounted on trim tabs, and since their design does not imply the presence of extra parts, a separate oil tank is not provided. What to do in this case? Prepare the fuel mixture.
For two-stroke engine lawn mowers, the same rules apply as for their larger counterparts, with one exception — you need to buy oil for units with a two-stroke engine.
On each trimmer (or in the instructions for it), the proportions of mixing fuel and oil are indicated: from 1:32 to 1:35. This rule applies only to mineral oil! And since it’s quite difficult to find it now, and it can scare off the cost, semi-synthetic or even synthetic oil is most often used. Note that the mixing proportions in this case change, and become. 1:50. If in doubt, carefully examine the oil packaging; this data is usually indicated on it. You should focus on them. To prepare the mixture, it is enough to pour 100 ml of oil into five liters of gasoline, this should be enough for a whole season of regular beveling. If not, repeat the procedure.
Internal combustion engines used in lawn mowers are two and four stroke. For users to know, a 4-stroke engine lawnmower oil is poured separately from gasoline. For a two-stroke engine, a fuel mixture is prepared with the addition of oil. At the same time, different compositions are recommended, which can not be replaced and mixed.
The role of oil in internal combustion engines
The energy transmitted by the engine shaft to the rotating mechanisms is obtained due to the adiabatic expansion of gases at the time of the explosion in the combustion chamber. Due to the movement of the piston in the combustion chamber, gas compression occurs. This means that the system works with minimal gaps, abrasion appears on the mating parts. The gap between the parts increases, and the compression compression decreases, the required pressure is not reached for igniting the fuel-air mixture.
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So it would be if the ground parts worked without lubrication. Motor oil for lawn mowers, added to gasoline or falling onto the crankcase assemblies, is applied with a thin film between the parts, preventing wear and tear. Since it is absolutely impossible to eliminate wear and tear, oil washes out microparticles in the gaps, preventing them from destroying the surface.
The device 2 and 4 of the cycle types is different and therefore the consistency of the lubricant and additives in it are different. Each type of conjugated nodes in the mechanisms requires types of lubricant that correspond to the nature of the movement of this node. What kind of oil to fill in the mower, the manufacturer recommends in the instructions for use.
You can not fill in oil, guided by the more expensive, the better. The use of ingredients depends on the class of technology on the degree of grinding of the mating units, operating conditions. The composition of the combustible mixture for two-stroke engines depends on the method of obtaining the base of the antifriction composition. Oil for a lawn mower with a 2-stroke engine has a special composition. All oils are separated by the method of preparation:
Their lubricating qualities and the ability to remain liquid at lower temperatures depend on this. But 5-15% in each composition is reserved for additives. This they create an effective composition that prevents:
- surface corrosion;
- thermal stability;
- resistance to decomposition;
- increased alkalinity, preventing oxidation;
- stabilize viscosity.
The lawn mower oil used with a 4-stroke engine has other additives, viscosity. It also serves to wash moving surfaces, but does not mix with gasoline. The oil is oxidized, contaminated with scale particles and requires replacement every 50 hours of operation.
The difference in the operation of 2 and 4 stroke engines
For two-stroke engines, there are two ways to lubricate the piston system and crank mechanism:
- adding oil to the fuel in the exact ratio;
- pour oil separately, the mixture is formed when the fuel is inlet into the cylinder.
In the photo, the oil supply through the plunger pump dispenser into the inlet pipe of the combustion chamber.
The second scheme has the future, while the first method is used in gardening. the preparation of a combustible mixture. New engines are quiet, economical, but more complex.
To prepare a combustible mixture, you can use the table and the dispenser.
The four-stroke engine has an oil tank, which is used to create protection for the rubbing parts. In this case, the lubrication system consists of a pump, an oil filter and tubes supplying the composition to the nodes. A crankcase or reservoir method of lubrication may be used. In the first case, oil is supplied to the system from the crankcase and from there pumped into the supply tubes. With a “dry sump” drops of oil collected in a pan are again sent to the tank.
In the photo, wet sump grease and dry sump grease.
The difference in oil composition for different types of engines is fundamental. Oil for a lawn mower with a 4-stroke engine should maintain a constant composition for a long time. The composition for two-stroke engines during combustion should have less mineral inclusions in order to prevent the formation of soot.
An important characteristic when choosing a protective ingredient is its operating temperature. The additive must be resistant to heat, but not thicken at low temperatures. Therefore, for each mechanism, depending on the operating conditions, there is a brand of oil.
Fundamental differences in internal combustion systems for the user
Which combustion system is more efficient, 2 or 4 stroke? How to understand the user and purchase the best mechanism? Gas trimmers and lawn mowers with a 4-stroke engine are not found on sale. The two-stroke is much easier and therefore the trimmer weighs a little and a woman can control it. But there are two-stroke engines on four-wheeled vehicles. Other differences:
- different ways to use grease;
- environmental friendliness is higher in a 4-stroke engine, it is also less noisy;
- easier to repair and maintain 2 stroke engine;
- 4-stroke motor resources are longer, but they have more difficult maintenance due to oil changes in the lawn mower;
- two-stroke motors are lighter and cheaper.
The 2-stroke engine used in the lawnmower is inferior in many technological indicators to the 4-stroke. With a separate supply of gasoline and oil for efficiency and other indicators, it is preferable for light vehicles. In addition, a separate fuel supply saves the cost of an expensive component by 4 times.
In the photo, the condition of the engine that worked without changing the oil for a long time.
The four-stroke engine has a complex lubrication system, and all the more it is necessary to use circulating fluid cleaning methods. A filter is installed in the oil system that prevents clogging of the pipes and pump with scale and other inclusions. As it gets dirty, this part is replaced.
How to change the oil in a 4-stroke engine
The manufacturer in the operating instructions gives a schedule for the maintenance of the mechanisms and the order of production. Lubrication efficiency decreases after 50 hours of operation of the mechanism. Therefore, an oil change is required. In domestic use for a season, this time of using the apparatus will not be typed, and the filter must be cleaned, oil must be replaced during conservation. Before changing the oil in the mower, it is necessary to increase the fluidity of the fluid, start the engine and allow the system to warm up.
It is necessary to unscrew the plug for filling the oil in the tank and use the device for selecting liquid under vacuum.
To do this, make a nozzle and pump out mining into a prepared container. But at the same time, a small part, up to 100 ml, still remains in the crankcase and drains from the filter. This residue must be disposed of by draining the liquid for about 5 minutes through the hole. Change or flush the filter in the system at the same time. After filling in new grease, checking the level with a dipstick. Usually, motor oil is packaged in opaque black plastic so that it does not decompose in the light. The required volume is 500-600 ml.