What kind of oil to put in a crosscut saw. How to fuel a gasoline lawnmower?

What gasoline and oil to put in a lawn mower

Self-propelled gasoline lawnmower is a sophisticated technique that can mow the grass, as well as perform other functions. Because it is equipped with a motor, it can also be used by physically weak people. You should take regular care of this machine. Oil change is one of the necessary procedures. Everyone who has such a device should know what kind of gasoline to pour into the lawnmower. It is necessary to know how to choose the right fuel for your model, it can be AL-KO (AL-KO), DAEWOO, Honda (Honda), Husqvarna (Husqvarna), Patriot (Patriot), Stiga, Champion, etc.д.

4-stroke engines, unlike 2-stroke engines, have a more complicated design. 4-stroke mowers are more powerful and therefore more efficient. These engines are more economical. run cleaner because they provide good control of the intake and exhaust cycles.

With the two-stroke cycle, because of the fact that the fuel comes out during feeding and compression, some of it is wasted. This does not happen in the other engine, gasoline is drawn into the closed loop system. 2-stroke engines are fueled with oil and gas mixtures. which reduces combustion efficiency, increases emissions in the form of burnt harmful oil. They mix fuel and oil together, this has a negative effect on life. Due to general circulation, these lawnmowers can be used in all conditions.

The 4-stroke engine has a dedicated lubrication system. Here, the engine oil is injected from a separate container. Oil is separated from the fuel. so the engine is better lubricated. Automotive engines mainly operate on the four-stroke cycle.

The simple design and fewer moving parts in 2-stroke brushcutters makes them easier to maintain and repair. They are much lighter.

Cleaner operation of the 4-stroke engine and special lubrication system reduces wear and tear and makes the engine last longer.

In 2-stroke engines, there is more wear and tear on the engine system due to the dirty combustion product that results from the combustion of fuel and oil. As a result, it fails sooner. Lawn mowers with this engine cost less but cost more per hour of operation because of the extra cost of oil and low fuel economy.

The lubrication system of two- and four-stroke engines

Four-stroke engines have separate oiling and air-fuel mixture preparation systems.

So the pump supplies oil directly to the surfaces that need to be lubricated, that is the crankshaft bearing and the point of contact between the piston and the cylinder bore.

The lubricant is poured into a reservoir where it flows through channels to the friction points.

The oil also flows through the crankshaft and connecting rod to the piston, where it bathes the piston, lowering its temperature and lubricating the cylinder walls.

Two-stroke engines do not have a separate lubrication system, but they also have a crankshaft bearing that needs friction reduction.

In such power units, the fuel-air mixture enters first into the crankcase, where the crankshaft bearing is located, and then, under the action of depression, it passes by the piston, cooling it and lubricating the cylinder walls, and enters the combustion chamber.

However, gasoline has no lubricating properties, so such devices are filled with a gasoline mixture, that is, liquid fuel, in which a special oil is added.

The efficiency of fuel mixture lubrication is much lower than that of engine oil, which is why the service life of a two-stroke engine bearing, and thus a crankshaft and connecting rod is much lower than that of a four-stroke engine component.

Also, the two-stroke lubrication system has special requirements for the oil, because it has to burn as much as possible in the cylinder and create a minimum of toxic substances.

Differences in the way engines are lubricated

An important point is the difference in the way two-stroke and four-stroke combustion engines are lubricated: the former require petrol, not pure gasoline, but a mix of petrol and oil in the required proportion. It combines with the air and circulates in the piston assembly, thus lubricating the cylinder walls, crankshaft and connecting rod bearings, and the pistons themselves. When the fuel mixture ignites, the oil that makes up the mixture also burns in minute drops. The combustion products come out as exhaust gas. In practice, the oil for a two-stroke lawnmower is mixed with petrol in specific proportions.

there are two-stroke engines that receive these components of the fuel mixture separately, but this advanced version is not installed on mowers.

When the engine is a 4-stroke, the oil is fed separately without first mixing with the gasoline. Practically the lubrication is realized thanks to the presence of pipelines, oil pump, valves, filter. The latter is designed to clean the oil of tiny metal particles that form when parts are worn.

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It turns out that the oil in 2-stroke engines burns during operation, but not in 4-stroke engines, and remains circulating in the system for a long period of time. This results in different requirements for performance. Two-stroke engine oil should leave a minimum possible amount of soot after combustion, and for four-stroke units it is necessary that the used lubricant retains its original physical and chemical properties for a long time.

What gasoline to fill

Lawnmower petrol. second element in the fuel mix. Its brand should be selected according to the manufacturer’s recommendations, as described in the machine’s data sheet. The longer the fuel burns and its resistance to detonation is indicated by the octane number: the higher the number, the longer the fuel burns. So, at gas stations you can buy such brands of petroleum products:

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A greater tendency to detonation has AI-92.

When using fuel with a higher octane rating than stated in the instruction manual, the engine is damaged in 2-stroke engines, and the piston group is damaged in units with a lower rating.

The mixture is prepared before operation in the proportion that is indicated on the gasoline tank cap:

This means that you need 20 ml of oil per 1 litre of fuel.

Manufacturers of gasoline mowers with a two-stroke engine (for example, Patriot PT 555 or Champion T336) specify the right proportion for the fuel mixture in the instruction manual of the tool. A ratio of 32:1 is suggested for the first model, for the second. 50:1.

Lawn mower with a 4-stroke engine does not require pre-preparation of petroleum product. There are 2 reservoirs in the machine. Gasoline must be poured into the tank, and the oil liquid. in the drain hole on the crankcase.

Features of garden equipment engines

Such motors work in two modes. The first is the idle running, when we just started the technique, and the mode of maximum revolutions. The lubricant must therefore retain a stable oil film under permanent, high loads.

Lubrication of four-stroke garden motors is done by spraying, because no oil pump is installed on such engines. For this equipment, the engine oil viscosity will be an important indicator. That is why the most common is the 30th viscosity.

Will a 4-cycle lawnmower run on 2-cycle gas/oil mix?

Important point: the engine of gardening equipment: grass trimmer or lawnmower, has only air cooling. Here the lubricant must operate at high temperatures and prevent the engine from overheating, that is, in fact, save it from heat stroke.

Some engines are finicky about sulfated ash, which is especially true for two-stroke engines. Such restrictions are set directly by the manufacturers of garden equipment, despite the fact that you can already find four-stroke engines with a requirement for low ash content. It is done only for ecology.

Rather strict environmental safety requirements. However, if you look at Russia, so far this process is not widespread. In the European market, only certified oils and lubricants need to be used in order to get into any kind of contract to service garden areas within the city limits. There, the materials should cause minimal damage to the soil and plantings.

Features of lawn mowers

Despite the fact that the general design of four-stroke lawn mower engines are similar to car engines, they still have important differences: in order to reduce the price of the product at lawn mowers excluded oil pump and generally the system of oil supply, it increases the requirements to the viscosity of the used in the motors of garden equipment.

The engine oil in the lawnmower engine is distributed by the crankshaft: it is scooped out of the crankcase and sprayed onto the parts. In connection with this design, the viscosity of the lubricant should be sufficient to retain the oil film on the parts, while at the same time it should not be too thick so as to interfere with the movement of parts or form a hard crust.

Lawnmowers, on the other hand, operate mostly at positive ambient temperatures and their engines are not under as much strain as car engines. Lawnmowers most often do not need a “cold start” in the cold, which greatly reduces the life of the car engine and requires low-temperature properties from the lubricant.

On the contrary, lawnmowers are usually air-cooled and therefore have higher engine temperatures than liquid-cooled car engines.

The first filling is intended for the running-in of the engine. after five hours of work it is replaced, and then you can work the whole season with the new grease. Afterwards the oil is replaced according to the regulations after a certain number of hours, or the oil is removed at the end of the dacha season and replaced with new oil the next year.

Oil selection and use

By design, the gasoline lawnmower engine differs from the car engine only in the number of cylinders and air cooling.

Its closest analogue is moped motors, because they also have only one cylinder and air cooling. So for gasoline lawnmower engines the same oil that is used for cars or mopeds is also suitable, if it corresponds to SAE and API requirements of the manufacturer.

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If the manufacturer has not indicated the parameters SAE and API, then you should focus on the following values:

Sometimes manufacturers recommend the oil of a certain brand, but it has nothing to do with the fact that it is better suited to this engine, but with the wish to earn money or partner obligations, because the manufacturer advertises his products or the products of his partners.

At that, such oil “for lawnmowers” does not have any real advantages, because car engines work under much heavier conditions, which means higher requirements to the oil for them.

In addition, it is important to choose the right oil according to the type of base, because it comes in:

The choice of basis depends on the age of the mower and the presence of a carburetor:

  • 20 years or older. mineral only.
  • 0-20 years, carburetor. mineral or semi-synthetic.
  • 10-20 years old, fuel injection is semi-synthetic.
  • 0-10 years old, fuel injection. synthetic or semi-synthetic.

The role of oil in a lawnmower motor

Gasoline lawnmowers can be equipped with four-stroke or two-stroke motors (ICE). The rotation/motion of the cutting elements is enabled by the energy supplied to them by the engine. Energy is produced by the expansion of gases created during the explosion of gasoline or fuel mixture in the combustion chamber. The compression of the gases created is achieved by the movement of the piston. Generally a simple principle of a combustion engine.

In order for such a system to function properly as a whole, there must not be too much clearance between its mating elements. If the gap dimensions are increased due to the wear of the working nodes, it will lead to a deterioration of the entire engine, and over time, and the simple inability to start it. The problem will be that the system will not be able to reach the required pressure for combustion of the fuel mixture mixed with atmospheric air.

Engine oil is designed to coat engine components with a thin film in order to slow down their wear process, as well as to prevent the formation of burrs on the metal surfaces of the mating parts. This is the main function of oil in the gasoline lawnmower engine. However, you should understand that oil does not stop completely the destruction of working nodes, caused by friction between them, but only slows down this process significantly.

In addition to reducing the friction coefficient between the mating working parts of the engine, the oil contributes:

  • Providing better cooling of the drive unit during operation, while increasing the level of heat exchange processes between the atmospheric air and the metal;
  • The engine should be run at maximum intensity, which increases efficiency and reduces the time spent on it;
  • protecting the drive unit metal from corrosion if the machine is not used for a long time during the cold season.

So engine oil is the special material that can provide failure-free operation of the engine and other systems in the mower. If this material is not used properly, the machine is more prone to breakdowns.

Design features of four-stroke and two-stroke engines

The way they work has a lot in common. The only difference is that a two-stroke motor has two strokes and a four-stroke motor has four strokes. One stroke is defined as a single downward or upward movement of the piston. Two strokes per revolution of the crankshaft. The stroke of the piston is understood to be its movement, during which the energy of the gases is converted into useful engine work (its rotation), as a result of the combustion of fuel.

Two-stroke and four-stroke models differ from each other in terms of performance and design characteristics as follows:

  • Two-stroke engines have approximately 1.5-1.8 times more power per liter.
  • They differ in the way they are lubricated.
  • The four-stroke engines are characterized by improved fuel economy (fuel consumption is reduced by 20-30%), and besides, the exhaust gases contain fewer toxic substances.
  • There are also differences in the way fuel and air are fed into the cylinder and the exhaust gases are removed. Four-stroke engines have a gas distribution mechanism that opens/closes special valves at necessary moments, while two-stroke models do not.
  • The four-stroke models are characterized by less noise.
  • The two-stroke models have a simpler overall design.
  • Improved lubrication system in four-stroke models greatly extends their service life. Also, they have a longer service life because the crankshaft rotates at lower speeds.
  • Two-stroke engines reach maximum rpm faster and accelerate more easily.
  • Periodic maintenance frequency will be easier for two-stroke models and can be done by yourself.
  • The four-stroke motors weigh more and cost more.

IMPORTANT! It is the absence of a timing mechanism equipped with valves that makes two-stroke engines simpler and lighter from a structural point of view. The air/fuel mixture fills the cylinder as well as cleans it of gas when the mixture is compressed/expanded and vented/injected through special openings.

Lubrication methods in different motor types

The use of oil in different types of engines to lubricate the internal parts is an essential point in the maintenance process and is that two-stroke models are not filled with pure gasoline, but with its mixture with motor oil in appropriate proportions. This mixture, when combined with air, wraps around the piston assembly and lubricates the cylinder walls, along with the connecting rod and crankshaft bearings, as well as the pistons themselves. During combustion of the fuel mixture, the oil it contains in its smallest drops also ignites. Products of combustion are converted into exhaust gas and exhausted to the outside through open holes.

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IMPORTANT! There are two-stroke engines that supply elements of the fuel mixture (oil and gasoline) separately, but these ICEs are not installed on lawnmowers.

Oil is fed to the four-stroke internal combustion engine separately, without mixing with petrol. The lubrication process is carried out by means of special pipelines, valves and filter, as well as an oil pump. The filter is designed to clean oil from tiny metal fragments, which are formed in the process of friction of metal parts.

It is clear from this that two-stroke engines will burn oil during operation, but four-stroke engines will not, and it remains in the system for a long period of time. That’s why the performance requirements are different for different types of internal combustion engines. These qualities include the fact that the oil for two-stroke devices should leave as little carbon residue as possible, and for four-stroke devices it is necessary that the oil substance should retain its useful physical and chemical properties as long as possible.

The fundamental differences of internal combustion systems for the user

Which combustion system is more efficient, 2-stroke or 4-stroke? How to understand the user and buy the best mechanism? Gasoline trimmers and brushcutters with a 4-stroke motor are not available on the market. The two-stroke is much lighter and therefore the grass trimmer weighs little and can be handled by a woman. But there are also two-stroke engines on four-wheelers. Other differences:

  • Different use of lubrication;
  • Eco-friendliness is better with a 4-stroke motor, it is also less noisy;
  • The 2-stroke engine is easier to repair and maintain;
  • The motor life is longer for the 4-stroke, but they have a more complicated maintenance due to oil changes in the lawnmower;
  • Two-stroke engines are lighter and cheaper.
kind, fuel, gasoline, lawnmower

The 2-stroke engine used in a lawn mower is inferior in many technological respects to the 4-stroke engine. With a separate petrol and oil supply, it is preferable for light equipment in terms of economy and other indicators. In addition, the separate fuel supply saves up to 4 times the consumption of an expensive component.

The photo shows the engine that has been running without oil changes for a long time.

The 4-stroke engine has a complicated lubrication system, and it is all the more necessary to use methods of cleaning the circulating fluid. The oil system has a filter to prevent scale and other debris from clogging the tubes and pump. This should be changed as contamination occurs.

kind, fuel, gasoline, lawnmower

How to change the oil in a 4-stroke engine

Manufacturer gives schedule of technical service of mechanisms and order of work in operation manual. The efficiency of the lubrication decreases after 50 hours of operation. That’s why an oil change is necessary. In daily use, the machine is not used for such a long period of time, and the filter must be cleaned and the oil changed at the moment of maintenance. Before changing the oil in the lawnmower it is necessary to increase the fluidity of the fluid, start the engine and let the system warm up.

It is necessary to unscrew cap for oil filling in the tank and use the device for drawing of liquid under vacuum.

To do this, make a nozzle and pump the waste into a prepared container. But in this case a small part, up to 100 ml remains in the crankcase and drains from the filter. You need to get rid of this residue by draining the fluid for about 5 minutes through the hole. I also change or wash the filter in the system at the same time. After pouring new grease, checking the level with a dipstick. They usually pack motor oil in opaque black plastic so it won’t decompose in the light. The required volume is 500-600 ml.

Changing the Oil in Your Lawnmower. Video

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I’ve had an American lawnmower for about 15 years. My engine is almost like new, I used only Liqui Moli oil after the factory one.

Thank you for the article! I have a 4-stroke mower. I buy Rasenmaher-Oil 30, a vegetable-based mineral oil from Liqui Moly, despite its high price. It does not change viscosity during operation, has good detergency properties, and, thanks to the additive package in this oil, reduces engine wear.

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