Missed spark on the trimmer what to do. How to check the ignition coil on the gasoline grass trimmer does not start the gasoline grass trimmer causes no spark
It often happens that the users of this kind of machines are trying to “save money” by filling the tank is not a fuel with a regular octane number, and something obscure, which is almost a decade stood in a plastic canister.
How do you check the coil on a chainsaw?
Many people today use a tester to check the machine’s parameters. But not everyone is familiar with the multimeter, in fact, a similar device that includes an ammeter, ohmmeter and voltmeter, respectively, they can determine the voltage, current and resistance. This comprehensive apparatus will answer the question: how to check the ignition coil on a chainsaw
- Checking the primary winding. The device is set in resistance measurement mode and connected to the positive and negative terminals of the coil.
- The average value should figure in the range from 0.4 to 2.0 ohms. regardless of the company-manufacturer of the apparatus.
- If the resistance value is 0, then a short circuit is the main cause of coil failure.
- If it shows infinity, you need to look for a broken chain.
- The secondary winding is checked by attaching a multimeter to the high-voltage lead and the positive contact.
- Here, the normal value should fall within the range of 6 to 8 kohms. In other types of coils, the parameter can reach 15 kOhm.
Do it with your own hands is quite realistic, and to clarify for yourself whether the obtained parameter is within the operational limits, only you need to be guided by the standards of your particular unit, which you can read in the manual, as well as in our useful articles. Less often, the working condition of the ignition coil is checked with an oscilloscope, it should also be connected to the coil winding wires, resulting in figures indicating its condition. It is important for users to understand the working condition of the coil, because it affects not only the start of today’s car operation, but also the whole mechanism. Working ignition coil as a line for the grass trimmer is an important component of the entire unit.
Instability in engine operation when warmed up.
It often happens that at cold start everything works fine, but after warming up the engine stops working or starts to work unstable. This is the most difficult situation to diagnose. Any part can be defective. With regard to the ignition such implicit failures are insidious in that a failure of the electrical system is mistakenly attributed to failure of the carburetor, piston-cylinder group, etc.д. In such cases, begin to “screw it on” The carburetor, by mistake, over-refining the mixture, changing it and the cylinder block. That is, an error in diagnosis leads to errors in settings and extra costs.
The method of checking for unstable operation of the coil from heat is obvious: if everything works fine on a cold engine, then if you heat (for example, with a hair dryer) only the coil, most likely there will be deviations. If this happens, the module should be replaced.
The following ways of checking can be supplemented by similar tests when the ignition coil heats up.
Do not sharply cool the heated coil. the primer may burst.
The grass trimmer gets very hot
Overheating of the grass trimmer can occur for many reasons:
- gasoline has the wrong octane number, which is specified in the instructions for the unit;
- the proportions of gasoline and oil during the preparation of the fuel mixture are not observed;
- The fuel-oil mixture was cooked a long time ago (the mixture should not be stored for more than 2 weeks);
- the grass trimmer operates for longer than the specified time;
- A low-power grass trimmer is used on dense and hard grass, the machine is overloaded and warms up quickly;
- the bar is dislodged to the side or the cover of the cartridge is stuck.
The latter is achieved by installing the mowing head is unsuitable for the unit. or when the axle is displaced inside the boom. These changes make it difficult to rotate, the load on the motor increases, and it overheats.
How to properly care for your chainsaw
There are no superfluous phrases in the instruction manual, everything that is suggested is aimed at trouble-free operation of the lawnmower. Cleaning all parts after each work cycle makes it easy to remove uncured residue and dirt. Clean only cooled components. This method contributes to the quality of air cooling of the engine and gearbox.
Fuel and oil recommended in the manual should be used for refueling. If you leave fuel mixture in the fuel tank the oil will float up and settle on the slide when you start, making it harder to regulate. The mixture can sludge and clog the fuel supply in the carburetor.
When preserving equipment for the winter, check the gearbox and piston system, Wrap the entire saw in oiled rags and store in a dry place.
It is not permissible, dangerous for the tool and the health of the mower, to use a metal cord instead of a fishing line. It is more efficient, but it puts extra load on gearbox and engine. Worn down piece of wire, when torn off, flies at the speed of a bullet. Effective mowing can lead to rapid wear of the engine piston group. Reasons for stopping if a gasoline grass trimmer that this device won’t start. For better mowing efficiency it is suggested to use the “star” profile of the line.
Caring for the homestead plot, gardeners periodically face the fact that the lawnmower does not start. There are many reasons for tool failure. In order to correctly diagnose the problem, the owner of a useful machine in the countryside needs to know the device and the principle of operation of its individual parts.
Since gasoline grass trimmer refers to complex devices, before starting work, it is necessary to carefully study the operating instructions. Very often it is simply ignored, or get acquainted with it superficially. As a result, when the tool stalls or refuses to start, the question arises. “Why won’t the lawnmower start??” A long seasonal break in the work, improper storage and untimely maintenance of the grass trimmer, will give a lot of trouble to the dacha owner, to eliminate the causes.
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In the case where there is no spark on the trimmer, how to solve the problem you will be prompted by professionals at the service station.
Sometimes the problem can be with the magneto. The magneto may have deteriorated because you may have pulled the starter cord when the ignition was off and the spark plug was not grounded to earth.
Such actions can easily take the magneto out of commission. In such a situation, the only solution is to buy a new magneto.
The ignition assembly may also be the problem. This option can be considered if the spark plug and wire do not have any faults.
In such a situation, the ignition assembly must be replaced. It can be found attached with two screws to the engine cylinder.
To gain free access to the node it is necessary to remove the guard.
To remedy the situation, it will be necessary to replace the entire unit, because, as practice has shown, the replacement of individual parts gives insufficient results.
If there is no spark on the trimmer, there is only one way to fix it. to replace it.
over, sometimes the problem is in the ignition coil. No spark can be caused by coil failure or malfunctioning in the circuit.
To check the current flow into the coil’s primary winding, you can use a light bulb, which should be turned on instead of the coil.
Gasoline trimmers use both two-stroke internal combustion engines (ICE) and four-stroke engines. But the ignition system in them does not differ from each other, so the repair and adjustment of this fuel ignition system will be the same for different types of engines.
Ignition system for two-stroke internal combustion engines consists of two elements: flywheel and coil (magneto). The illustration below shows what they look like.
There is an impeller on the flywheel, which works as a fan to cool the engine. Also on one side of the handwheel are permanent magnets, shown with an arrow in the figure.
When the handwheel rotates the coil generates electric current which carries the spark plug. The spark is ignited when the magnets are placed directly underneath the magnetos.
How to prevent sudden breakdowns during operation of the grass trimmer?
To keep the machine in good working order at all times, it is worth following a few simple rules:
- Perform timely, regular technical inspections of the main mechanical components of the device.
- Only fill the grass trimmer with fresh fuel of unquestionable quality and origin.
- Check after each use for oxide and deposits on the surface of the ignition system.
- Avoid subjecting the grass trimmer to high stress when working.
In order to keep the unit in working order it is necessary to prepare it correctly for storage in winter. First of all the tool should be completely disassembled, after which the component parts should be washed and cleaned. It is also important to inspect the functional units for damage, and if necessary, repair any deformities, misalignments, or material tears.
Putting the grass trimmer in storage, it is worth filling the gearbox with a sufficient amount of oil. Then it is necessary to perform cleaning of the air filter, partially disassemble, purge and wash can be the engine of the machine. After all the mechanisms have been dried, lubricate the moving parts. In order to treat the piston system with oil, the spark plug must first be removed. Then you must move the piston to its extreme position, and then pour a small amount of oil into the spark plug hole and crank the crankshaft. If you store a gasoline trimmer for grass in the off-season is not planned in the house, it is recommended to wrap the engine unit tightly with oiled rags. This avoids the development of corrosion on the surface of important parts of the machine.
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Many trimmer owners face a problem when the device simply does not start. One of the reasons for this could be a lack of spark. This usually happens when the fuel floods the spark plug. In addition, you need to check the plugs for serviceability, as this can also lead to a lack of spark.
The first sign of a faulty spark plug is the presence of a short circuit between its contacts, and in short. no spark on the trimmer. In addition, a spark plug is considered faulty if it is covered with a black damp layer.
This layer appears from the oil in the combustion chamber. In such a situation, you have two choices: either clean the spark plug properly, or buy a new one. Sometimes it happens that the plugs are clean, but, in this case, the problem may be in its insulation, which is often covered with a black dry sludge. The cause could be a weak spark, a spark plug temperature that is too low, poor fuel quality, a dirty air filter or prolonged idling. Here, the solution is the same: clean the spark plug or replace it with a new one. over, the spark plug should also be replaced if the contacts are quite worn out.
In the case where there is no spark on the trimmer, how to solve the problem you will prompt the professionals at the service station. Sometimes the problem may be with the magneto. The magneto can fail because you may have pulled the starter cord when the ignition was off and the spark plug was not grounded to the ground. Such actions can easily break the magneto. In this situation, the only solution is to buy a new magneto.
Alternatively, the problem may lie in the ignition assembly. This option can be considered if the spark plug and wire do not have any faults. In such a situation you need to replace the ignition unit. It can be found attached to the engine cylinder with two screws. In order to gain free access to the assembly it is necessary to remove the enclosing casing. To correct the situation, the entire assembly must be replaced, since experience has shown that replacing individual parts is not sufficient. If there is no spark on the trimmer, there is only one way to fix it: replace the.
over, sometimes the problem should be looked for in the ignition coil. The lack of spark can be caused by coil failure or malfunction in the circuit. To check the current flow into the coil primary winding, you can use a light bulb, which should be turned on instead of the coil. Then the pins of the shearbolt must be carefully inspected. If at the moment of opening there is a strong spark between the contacts, you can be sure that the capacitor is broken. In that case you have only one option for further action. to replace the condenser.