How to check a chainsaw ignition module

How to ring a chainsaw coil

Ignition modules and coils sometimes suffer breakdowns. When everything else is checked, the suspicion is. When they fail, one of two things usually happens. The obvious symptom is no spark. The only thing you can do is replace the module with a new one. or better yet, try to swap it from the saw you are using. If the spark did not appear after replacing the modules, you must have missed something.

Replacing the module is the only reliable way to check the spark. All kinds of testers, as practice shows, are not true. The only reliable test is to replace the coil. Another symptom that indicates a bad electronic module or coil is a spark that becomes weak when the saw gets hot. If the saw won’t start after refueling, it’s likely that the engine heat has eliminated the spark. A weak ignition coil can sometimes give enough spark to start and run the saw until it is properly warmed up. When the saw and the coil respectively get hot, the transistor resistance increases and the spark becomes weak. Symptoms: the saw starts and works well in the store, for example, but at work the saw dies and does not start until it cools down. It may be difficult for the store to prove this malfunction.

This is a load simulator used to diagnose the engine of saws with ignition systems that have problems related to heating. It is an adjustable pneumatic brake system, the motor thinks that wood cutting is in progress. With this tool, we can heat the saw’s motor to operating temperature in a very short time. Because the load is constant and adjustable, you can easily monitor the engine for misfires or other operational defects that would be difficult to observe when sawing wood.

It also makes sense under these conditions, after overheating does not start, to try unscrewing and screwing the tank cap. releasing the accumulated fuel gases. If the saw starts after that, you figure it out.

Basic troubleshooting

If you can’t start the saw the first time, there could be several reasons. Most often the problem is related to the spark plug:

  • Electrode wear or damage to the ceramic insulator;
  • Loose fit of the removable cap (if present);
  • spark wandering along the ceramic winding, a sign of which is a brown residue on the outer sheath;
  • cracked spark plug cap (a saw with such a problem will continue to operate, but may hurt the user when touched).

If no problems were found with the spark plug, it is recommended to inspect the wires coming from the coil. They may be broken or have other mechanical damage. Wires inside the insulation may be broken, so sometimes you can’t detect these irregularities upon visual inspection.

The cause of the problem may be in the trip tumblers. It is not difficult to check them. To do this, disconnect the wires from the module and then check the ignition. If the spark continues to appear after disconnecting, the switch needs to be replaced.

Problem Finding Algorithm

In all other cases, ignition troubleshooting begins at the end and in order. After each step, check the spark.

  • Replace the old spark plug with a guaranteed working spark plug.
  • If the model has a removable spark plug cover, it is removed, the bare spark plug wire is shorted to ground with a gap, about the same as the spark plug. Pull the starter. If there is a spark, the problem is in the cap. It is eliminated.
  • Replace the spark plug wire where it is possible to remove it from the source.
  • Visually inspect the wires from the switch. In case of vibration, in case of contact with metal, they can be damaged. If there are friction spots, the wire is replaced, even if there is no external damage to the insulation. A tester or multimeter can be used to check the wire.

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This is the end of the small, easily fixable problem. If the problem is not solved, then the cause is more serious. Modern coils and ignition systems on most chainsaws are very reliable. They are designed for an even longer service life than the chainsaw as a whole. They have no mechanical moving parts like the old cam systems. They are sufficiently insulated against clogging and moisture.

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If an accidental factory defect causes an intercircuit in the coil or the electronics break down, these parts cannot be repaired. Will need to be replaced with new ones.

There is not an uncommon mechanical breakdown. If the crankshaft bearing is worn or fractured, it has a certain amount of play. And then the magnetic rotor starts to rub against the ignition system housing, inside which it rotates. This is a serious breakdown. You have to “hollow out” (disassemble) the whole motor, replace the bearing, and reassemble everything.

Starter construction

Often, chainsaw manufacturers equip their units with starters that work on almost the same principle, namely, in the groove of the saw housing is located handle, through which the cord is passed. When the handle is raised sharply, the cord is also pulled, causing the drum of the ratchet mechanism to engage. In this way, the cylinder with studs, which is located on the shaft, is actuated. At this time the crankshaft makes several revolutions, leading to compression of the fuel mixture, which at this moment is between the cylinder head and the piston. When the handle is lowered, on the contrary, the ratchet and the studs lose their contact, which causes the shaft to stop.

Increasing the power of the chainsaw increases the amount of fuel mixture, which must ignite when starting the chainsaw. In such a case it is necessary to increase the number of jerks of the starter cord in order to start the engine. To speed up the return of the reel mechanism, manufacturers use a special steel starter return spring, which has excellent elasticity.

If the spring is broken, it is necessary to: remove the cage of the mechanism, pull out the spring by fixing the upper part of it with a finger and pulling slightly aside the handle of the starter. Then, wrap a new part, avoiding kinking and twisting the new spring element, then carefully fix the casing.

How to check a chainsaw ignition coil?

If after adjusting the necessary gap the chainsaw still does not start, then the coil itself is defective. To determine the exact cause of the failure, you will need to do the following steps:

  • check the part with a device that measures the presence of the spark. for this purpose, the device should be connected in the gap of the electrical circuit between the high-voltage factory wire of the regular coil and the spark plug;
  • Make resistance measurements of the original coil. this method is not often used, as the owner of the utility saw needs to know the exact resistance values of the coil in advance. In addition, in addition to the inductive coil, the ignition contains certain semiconductor elements that help to form the necessary high-voltage pulse. Problems in them can be determined only after preheating. To measure the resistance, it is necessary to disconnect the cap and armature wire from the coil. This may be difficult for an inexperienced chainsaw user, so this kind of check is best done only in a specialized shop;
  • check the coil directly with the help of a spark plug. to do this, unscrew the original spark plug and put it on the cylinder. Next, pull sharply on the plastic handle of the built-in starter and observe the spark formed between the contacts of the spark plug used. It should be noted that this method gives only a rough idea of the serviceability of the factory coil. The fact that the used plug at the time of testing is not under the correct pressure, as a result of which the standard flywheel, due to lack of compression, will initially rotate faster.

How to adjust the ignition on a chainsaw

Periodically, the adjustment of the ignition of the chainsaw should be performed. This action requires the adjustment of the spark plug gap between the coil and flywheel. The parameter depends on the model of the chainsaw. It is specified in the instruction manual. The average value is the parameter 0.2-0.4 mm. The correct gap is important so that the spark is at the right place at the right time, i.e. е. not earlier and not much later than the fuel supply.

Adjust the ignition on the chainsaw will help special templates, but it is not always advisable to buy them for one-time use. So you can replace it with a homemade one. To make it, you have to cut a strip from a plastic bottle. The part of the container where there is no embossing is suitable. After that, you can install the ignition, acting in the following sequence:

  • Unscrew the ignition bolts slightly to loosen.
  • The magnets, which are located on the flywheel, lead to the ignition coil.
  • Clamp the plastic strip between the flywheel and the coil, and then screw the bolts back on.
  • Remove the strip.
  • Turn the flywheel all the way round several times in a row, making sure that it does not catch on anything.
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If the diagnosis revealed any faults in the coil and adjusting it did not work, then the part must be replaced, because the repair is impractical.

How to adjust the ignition on the chainsaw?

As with the constant need to adjust the carburetor itself, the chainsaw used in a private household or on the shaft of the forest should lend itself to the timely adjustment of the built-in regular ignition. The essence of this procedure is to set the gap originally provided between the flywheel of the power unit and the OEM ignition coil. The size of this gap may initially be different. it all depends on the purpose, as well as the design features of the saw. An average distance is considered to be not less than 0.2 and not more than 0.4 mm. If the correct gap is breached, the basic ignition system will not be able to generate the spark required for the timely instantaneous ignition of the refueled fuel mixture.

The operator can adjust the ignition on the chainsaw directly in this order:

  • First it is necessary to slightly loosen the plastic bolts designed to fix the element of the regular ignition;
  • Next, the magnets provided on the flywheel will need to be brought up to the factory coil;
  • Then between the base high-voltage coil and the built-in flywheel of the engine, a homemade or previously purchased template must be installed. After that, the bolts fixing the coil will need to be screwed in the opposite direction;
  • Next, the operator must carefully remove the template.
  • At the end it will be necessary to crank the built-in flywheel. At the same time, make sure that the element does not touch the spool and other parts of the chainsaw as it rotates.

If, for some reason, the adjustment of the ignition of chainsaws led to a permanent contact of the flywheel, then it is necessary to inspect the tendrils that fix it in its normal place. If they are deformed, the fasteners need to be replaced.

The external condition is an important criterion

When a chainsaw has been stored in the store for a long period of time, it should be checked for proper operation before purchase. Do not try to start the tool

check, chainsaw, ignition, module

First of all, it is important to assess the appearance of the device and check whether there is no on the body:

Particular attention should be paid to the spigots. If these parts are deformed, they should be replaced immediately

If the unit has been stored for an extended period of time, it should be completely drained of all available fuel. Oil and gasoline mixed with each other will form a sludge over a long period of time. It can spoil the condition of the carburetor.

Electronic ignition for chain saws “Druzhba” and “Ural”: check performance, self-repair

The main question that buyers ask themselves is the simplest one: how to buy the right product? But even little-known brands have dozens of different tools on sale, not to mention the world-famous companies. So how to choose the right one? For this purpose it is worth to understand what the main characteristics of a chainsaw mean, why they are highlighted and whether large numbers always mean high performance, not only high cost.

Technical parameters are directly related to the design of the tool and the principle of its operation. For example, the volume and type of the engine determine the power, the allowable dimensions of the chain saw. The design and materials used determine the weight.

In general, the design of a chainsaw is the motor, the torque transmission mechanisms and the saw blade. The engine and the chain are connected by a gearbox (transmission system) and a clutch system. The saw blade is a guide bar with a chain on it. Because the chainsaw engine is a two-stroke engine, it has two tanks: an oil tank (for chain lubrication) and a fuel tank (for fuel mixture).

The fuel mix is used instead of petrol because of the two-stroke engine that does not have a separate tank for the lubrication of its internal elements.

The tool works in the following way: when the user pulls the “cord” of the starter, the crankshaft is cranked. if there is enough fuel in the tank, the spark plug lights up at one of the revolutions. the spark ignites the fuel.

It, as it burns, gives off increasing volume of gases, which push the piston.This element is connected by a connecting rod to the crankshaft which inertia makes a second revolution and thus continues the process anew without external forces. When starting the saw, the engine starts spinning the drive sprocket.

check, chainsaw, ignition, module

it in turn attaches the saw blade, and the chain, driven by the sprocket, begins to “walk” in the grooves of the bar. the chain is lubricated automatically when it is in motion. when the work is finished, if you turn off the chain saw, you will notice that some lubrication oil flows out of it.This is the unused oil left in the grooves.

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capacities of engine, fuel tank and oil tank

The size and capacity of the engine directly affects the power of the saw itself, the bigger it is, the more energy is released for the movement of the piston. Volume also tells you how much fuel you can burn in a given amount of time. It is worth remembering that if the volume of the engine does not match the power of the saw, it reduces its life, due to the inefficient use of.

check, chainsaw, ignition, module

The volume of the tank for the fuel mixture is from 0.3 to 1 liter. Accordingly, oil tank is 1.5-2 times smaller. This difference in volume helps the fuel mixture and oil flow at almost the same rate (about 30-50 minutes) when the tool is fully loaded.

Household class saws have an engine capacity of up to 40, that’s 1.5 to 2 hours without refueling. Semi-professional saws, capable of working 8 hours have an engine capacity up to 60, and professional up to 121 cc.see. Models with a larger displacement are fitted with additional starting aids.Power

Stihl MS 361No StartBad Ignition Module??? OR Fly Wheel???

Higher engine displacement makes the saw more powerful and therefore more productive. Speed and intensity of cuts depend on power. Measured in “horsepower” or kW (1hp.с. = 0.735 kW). Depending on the power saws are divided into classes and applications.up to 2 kW. domesticOutput 0,74 to 2,94 kW. semi-professional

High-powered chain saws require additional physical effort during work and knowledge of safe use techniques, because it is quite difficult to control such a tool. Power of the equipment can decrease due to natural wear of components, use of low-quality fuel mixture and improperly selected sawing equipment.Weight

The nominal weight of a chainsaw is the sum of the weight of the engine and the body with the handles. Knowing the weight, you can also get an idea of the functionality of the equipment: Household saws weigh an average of 2 to 5 kg.

They don’t need much power and the main requirement to them is convenience and ease of carrying out periodic small jobs (cutting firewood, cutting branches).Semi-professional saws weigh a bit more. 5-7 kg, which indicates a higher power, and therefore a wider scope of work.

Since this type of saw is often used as loppers, the design includes lightweight bars.

As for professional saws, the most powerful ones weigh up to 11 kg.

They are “lightened” by using lighter alloys (mostly magnesium-based) for the cylinder and crankcase. The aim is to make the tool lighter, but not to reduce the life, reliability and safety of the product during use.

Husqvarna 372XP bad ignition module (cutting out)

It is not only the weight of these elements that is stressed by the chainsaw, but also the weight of the cutting attachment and the fuel and oil tanks that are completely filled. Therefore, if low weight is an important criterion, you should give preference to household and one-handed saws. they are lighter than others.

This parameter becomes decisive when choosing a tool for crowning. cutting the upper branches and across the crown of a tree. A heavy chain saw in this case is not only inefficient, but also dangerous. the maneuverability is low, and the weight and vibration of a powerful engine will quickly lead to fatigue of the master, it is difficult to hold it in weight and it is absolutely impossible to do it with one hand.

That is why specialized lightweight tools are recommended for this type of work.

Also note that people who are contraindicated to intense physical activity, it is not recommended to use chainsaws that weigh more than 5 kg.

Working with a professional chainsaw requires good physical preparation, because a heavy chainsaw is not only inefficient, but also unsafe.к. there are no belt clamps for these types of saws because of the high risk of unforeseen complications during work (falling down a tree, for example). The operator must have time to let go of the tool and not release it.

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