The function of oil in a lawnmower engine
Gasoline lawnmowers use two- and four-stroke combustion engines. The blades move with the energy of the engine. It results from the expansion of gases produced by the explosion of gasoline or fuel mixture in the combustion chamber. The gas is compressed by the movement of the piston.
For the system to work well, there must be as little clearance as possible between the mating parts. If their size increases due to wear of the working parts, it leads to deterioration of the motor unit, and over time and to the complete inability to start it in operation. The problem is connected with the fact that the required pressure value for ignition of the fuel mixture mixed with atmospheric air is not reached.
Engine oil coats engine parts with a thin film, which slows down their wear and prevents scuffing on the metal surface of the mating structural elements. This is the main role of oil in a petrol lawnmower drive train.
Destruction of units, caused by friction between parts, is not completely stopped, but the use of high-quality materials significantly slows down the process.
In addition to reducing friction between interacting internal combustion engine parts, the use of oil allows
- is to ensure a better cooling of the drive unit during operation by improving the heat exchange between the metal and the atmospheric air;
- Do the job by running the engine at maximum speed, which improves efficiency and reduces the amount of time you have to work;
- to protect the metal of the driving mechanism against corrosion during the winter downtime of the machine.
High quality oils reduce the negative effects of increased temperature on motor parts. By dissipating heat, it increases the amount of time the machine will run before overheating.
Engine oil is a special material that makes sure the internal combustion engine and other systems in the lawnmower work properly. Neglecting its quality leads to various damage to the unit.
Choosing lawnmower oil
Every summer is the start of the high-temperature season for gasoline-powered machines. Even in our country in recent years lawn mowers, previously known to us only from TV movies, have started to be actively used.
One thing they often forget is that even lawnmower oil should be chosen according to ambient temperatures.
It is known that any lubricant for four-stroke engines must meet certain SAE viscosity ratings. Of course, lawn grass at sub-zero ambient temperatures grows very poorly, so when buying it is necessary to focus on the products, whose indicator on this parameter corresponds to the summer operation.
Most manufacturers state that SAE 30 oils are optimal for lawnmowers. The use of less viscous grades for colder climates and thicker greases for hotter regions is also discouraged. Why?
It’s about the design of these devices. In order to make them cheaper and easier to produce, the designers excluded the oil pump from their composition. As a result, all moving parts of the engine are lubricated thanks to the crankshaft, which during its movement scoops it up from the crankcase, distributing the lubricant evenly due to friction over all the parts. That’s why you can’t buy lawn mower oil at the first place you see, because you may later be happy with the bill for its repair.
So, if the consistency of the grease is too thin, it will simply flow from the crankshaft back into the crankcase. If it is too thick, then over time, such a substance can turn into an amonous solid mass, which also does not lead to anything good.
Cars are much better protected from such troubles, since a special oil pump is responsible for the evenness of engine lubrication there. Theoretically, all the oil for lawnmowers can be used in cars, but the standard products for cars will not always suit other equipment.
Fortunately, specialized SAE 30 class lubricants are now available in almost all specialty retail chains. But these places are not found in all cities, let alone in smaller towns. So what oil to pour into the lawnmower in the absence of specialized options?
Experts say that SAE 15W-40 and SAE 20W-50 class lubricants are best suited for this purpose. It does not matter much whether you buy synthetic or mineral oil, because lawnmowers are not used in as harsh conditions as race cars have to go through.
Which oil and petrol to choose for filling lawn mowers with a two- or four-stroke engine
Preparing, mixing and changing the fuel-air mixture are the main maintenance procedures for a garden mower. The quality and composition of the fuel and lubricant used determines the longevity of not only the rotating parts, but also the engine.
Lawnmower oil covers rubbing parts and clearances between parts with a thin, viscous film that reduces wear and scratches in operation.
Features of four-stroke engines
First you need to understand the difference between engines that have different types of cooling: air or water. The point is that the engine pistons in 4-stroke engines, cooled with air, experience temperature much higher than that of their water counterparts. It turns out that the requirements to the quality composition of the oil for air-cooled engines increase several times.
It is very important that the engine immediately after start-up is protected by a film that envelops it, even when it meets all the technical standards and the running-in has been successful. Therefore, oil produced for two-stroke engines should not be used in this case. Why? Yes because in the first case, the oil is mixed with gasoline before starting, and in the second case, the premixing of oil and fuel is prohibited. It is explained by the fact that two-stroke engines have a special existing lubricating and protective system for units and parts, which are subject to friction.
The difference between the engines
The main difference is the number of strokes, which determines how to lubricate the rubbing parts and the fuel supply.
The four-stroke engines run on pure gasoline, because the oil for lubricating the working parts is located in a special container. a sump or crankcase.
Two-stroke motors have no oil reserve, so they operate on a mixture of gasoline and oil, and the same mixture is used to lubricate the rubbing parts.
That’s why oil for trimmers and other two-strokes is not suitable for lawnmowers, and vice versa, oil for lawnmowers or other four-strokes cannot be used to make a mixture for two-stroke motors.
The choice of fuel
After buying a new brushcutter the owner who has never used it may not know what kind of gasoline to use, how to choose the right fuel, how to change it. First of all, it is necessary to clarify the type of engine, which is equipped with this technique. Experts do not advise to operate 2 types of motor on fuel that has the same composition. A gasoline engine must run on gasoline, which must be diluted with engine oil. It will protect injectors and valves, save them from quick failure.
Proper operation of the engine of a particular lawnmower will ensure the proper type of oil, which can be:
Lawnmower oil: how to change it correctly and what fluid is better to pour
A lawn mower is a very useful thing for those who need to periodically mow grass on lawns and other land areas. However, with the purchase of this tool, you should not forget that it, like any other mechanism, requires periodic maintenance. One of these moments is changing the oil. How to change the oil in your lawnmower, what kind of fluid is better to use?? You will learn the answer from the article.
Lawn mower oil rating for 2022
Oils for four-stroke engines
This lubricant has several degrees of protection at once, so if you buy it in almost any store, you can be sure of the quality. Judging by the responses, this fluid is of high quality and can be successfully used in respective engines. It contains a balanced set of additives, which provide increased efficiency, and medium consistency significantly expands the temperature range of application. Installed
This sample has the lowest thickening index, which means that it can be used even at minus temperatures. The composition contains innovative additives from foreign manufacturers, which significantly affects the characteristics of counteraction to fouling and corrosive manifestations. Generally described as a product that will extend the life of the mower many times over. Recommended
An excellent version of the German manufacturer, characterized by its general versatility. Ideal for both gasoline and diesel models. The composition is based on a mineral substance and includes a maximum set of additives that can work with any type of fuel. However, due to its popularity, this brand often suffers from counterfeit. Recommended
About this and other brand products for garden equipment in
How To Do a Small Engine Oil Change
Although this product is not a brand name product, most experts consider it to be a reliable alternative suitable for all motors. The substance itself is of very high quality, the set of additives present is fully balanced. Even if you use it intensively for a long time, the grease will not cause any critical fouling or grime. Installed
Useful tips for changing oil, in this case BRIGGS STRATTON 4 Stroke oil:
How to change the oil in a Briggs & Stratton lawn mower engine
Oils for two-stroke engines
This is a very popular lubricant among lubricants used in two-stroke engines. Its main feature is the fact that it can be filled into any combustion engine with a capacity of up to 100 “cubic meters. Thus, it is suitable not only for a lawnmower, but also for a chainsaw, and for a moped, and for a motorcycle. Comes in an exceptionally handy container, the volume of which starts from 0.5 liter (maximum. 5 liters). However, due to its widespread distribution, this grade is most often counterfeited. Recommended
This lubricant is a product of a well-known brand, but for all its quality, it is not overpriced. Huter is tightly associated in Europe with the concept of “high-quality garden equipment and supplies for it”. This material is an example of an excellent combination of price and quality. The composition includes its own original set of solvents, which are responsible for the complete mixing of the material with fuel. Its performance is characterised by an almost complete burnout, with practically no residue, which means that no carbon build-up can occur on the working parts of the engine. Can be perfectly applied as a full analogue for most grades of oil. Installed
This product belongs to the category of especially expensive, which is fully justified. This composition contains the maximum amount of original additives from the world known manufacturer, which allows the substance to blend excellently with fuel. The entire mixture will burn with little or no carbon buildup, ensuring long life for all working parts of the unit. Quite interchangeable. No restrictions in terms of balance. Recommended
On how to distinguish the original product from a fake in the
Multi-purpose grease and is suitable for almost all garden devices that use a two-stroke internal combustion engine. The substance contains an innovative type of additive that allows it to mix with fuel as efficiently as possible, making the resulting mixture almost a single mass. Characterized by great popularity. Installed
The difference between 4-stroke and 2-stroke lawnmower oil
The energy transferred by the engine shaft to the rotating mechanisms is derived from the adiabatic expansion of the gases at the moment of explosion in the combustion chamber. The gases are compressed in the combustion chamber by the movement of the piston. This means that the system works with minimum clearances, there is abrasion on the mating parts. The gap between the parts increases and the compression decreases, the required pressure for ignition of the fuel-air mixture is not reached.
How To Install Oil Into A Lawn Mower Engine
This would be the case if the lapped parts worked without lubrication. Lawn mower engine oil added to petrol or transferred to the components from the crankcase, forms a thin film between the parts, preventing wear, scuffing. Since absolutely no wear can be eliminated, the oil washes out the micro particles in the gaps, preventing them from destroying the surface.
The prepared fuel mixture should be used within 2 weeks, stored in a metal or polypropylene container. Do not store gasoline compound in polyethylene bottles. The decomposition products will get into the mixture, increasing the soot in the combustion chamber.
The structure of 2 and 4-stroke types is different and therefore the consistency of the lubricant, additives in it are different. Each type of mating assemblies in the machinery requires types of grease appropriate to the nature of movement of that assembly. What oil to put in the lawnmower is recommended by the manufacturer in the instruction manual.
Do not fill up with oil, guided by the more expensive the better. The use of ingredients depends on the class of equipment from the degree of grinding of the mating assemblies, operating conditions. Composition of combustible mixture for two-stroke engines depends on how the base of antifriction composition. Oil for lawnmower with 2-stroke engine has a special composition. All oils are categorized by the method of production:
Their lubricating qualities and ability to remain liquid at low temperatures depend on it. But 5-15% of each compound is given to additives. They are the ones that create an effective compound that prevents:
- surface corrosion;
- thermal stability;
- resistance to degradation;
- Increases the alkalinity which prevents oxidation;
- stabilize the viscosity.
Lawnmower oil used with 4-stroke engines has different additives, viscosity. It is also used to wash the moving surfaces, but it is not mixed with gasoline. Oil oxidizes, becomes contaminated with scale particles and must be changed every 50 hours.