Why is bridging necessary?
Many people ask the question of why running in and is it not better to start using the tool right away. Experts unanimously argue that running in is essential for any mechanism, not to mention a chainsaw, which sometimes works in conditions of increased complexity. However, running-in should be carried out according to certain rules, otherwise the tool can be broken.
The running-in is designed to ensure that all parts run in in a short period of time, working without load. At this time, you can test the tool by observing the behavior of all its systems. All parts are lapped, gaps are partially formed and all structural parts are lubricated. In order not to knock down the settings and adjustments, a gentle mode is applied during the break-in period. However, there is no need to feel sorry for the tool either, since you need to check it in all modes. The statement that the break-in must be performed at idle is not true, as this contributes to the formation of soot.
Appointment of the Champion 240 model
As a rule, the Champion 240 chainsaw is purchased for work in a suburban area. The model class suggests the ability to use a saw to perform more complex tasks. At the same time, many owners recommend using the product only for household needs. Based on the manufacturer's recommendations, the Champion 240 chainsaw can be used:
- for cutting material during the construction of wooden premises on the site;
- when preparing firewood;
- for gardening work;
- at a logging company for simple tasks.
Carrying out preparatory work for the first launch
Preparation for launch is the preparation of the fuel mixture and a visual inspection of the chainsaw. It is necessary to make sure that all mechanisms work and are adjusted. Then proceed according to the following plan:
- Pour the prepared mixture into the tank;
- Disengage the chain brake;
- Open the air damper;
- Turn on the ignition;
- Pull the starter handle to start the engine;
- After turning on the saw, press the gas button and wait until the saw picks up speed, and then switch to idle.
Features for Chinese devices
Each chainsaw differs from similar models in design features, the dosage of the fuel-oil working mixture, therefore, even with proper experience, it is recommended that you familiarize yourself with the contents of the attached operating instructions.
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For the preparation of fuel, it is advised to use fresh gasoline with an octane rating of at least 90 and a heat-resistant engine oil recommended by the manufacturer, in the dosage indicated in the instructions.
The fuel mixture in an amount sufficient for one-time operation is prepared in a fireproof metal container, in the best case with a hermetic stopper. In the absence of oils recommended by the manufacturer, it is possible to replace it with a full-fledged analogue of the JASOFB or ISOEGB category.
Gasoline with an oil component should not be stored for more than 2 months. The working properties of an overexposed gasoline-oil mixture deteriorate significantly over time.
Carburetor regulation rules
In order for the chainsaw to work stably, it is necessary to regularly carry out technical inspection and, in particular, adjust the carburetor. If you determine that the saw needs proper adjustment, but the tool is under warranty, it is best to take it to a service center.
In order to adjust the carburetor yourself, you need to use special adjusting screws. The photo below shows the location of the adjusting screws.
You need to act in the following order:
- Start the engine;
- Unscrew the screws L and H until they stop, and then gradually turn back one and a half turns;
- Leave the saw to work for 5-10 minutes;
- To set the idle, you must use the screw T;
The correct adjustment is indicated by the fact that the chain does not rotate at idle.
Running in a two-stroke engine
By purchasing a new chainsaw (trimmer, motor drill, generator) with a two-stroke engine, many people want to run in.
In the understanding of the majority, “running in” is performed to run in engine parts at idle. So, modern two-stroke air-cooled engines do not need such a run-in !!! Even more than that - it is contraindicated!
Let's try to explain why?
A two-stroke engine runs on a mixture of fuels: gasoline, oil and air. When the operating speed is reached (at full throttle, at an open damper), the oil in the cylinder burns out completely, without settling on the surfaces of the cylinder, piston, muffler. If the engine does not reach operating speed, then there is an accumulation of unburned oil. You can even see that the oil begins to flow out of the muffler ... And during prolonged idling, as happens during the "break-in", little air enters, the oil does not burn out, the engine does not cool. An excessive amount of oil in the air-fuel mixture (at idle, little air is supplied to the mixture, the mixture is “rich”) leads to coking of the exhaust window and the formation of carbon deposits on the piston.
Braids (chainsaws) are periodically brought to our Service Center after such a break-in. The severity of the problems is different for everyone: some were frightened by the fact that oil flowed from the muffler and they stopped running. In this case, the owner of a new scythe or saw gets off with a slight fright))) The worst thing is when the newly-made owner of a two-stroke engine runs in several tanks of fuel (2-3), in summer at an air temperature of 25C. Here the consequences can be as in the photo above. And it’s good if this soot didn’t break off and there was no scuffing of the cylinder-piston group ... And this also happens.
And the newly minted owners of a brand new mower are very sincerely surprised that such problems could arise, because they seem to have done everything right ...
It should be noted that for a two-stroke generator engine, working to illuminate one light bulb is equivalent to idling. Therefore, prolonged use of the generator in this way leads to the consequences described above. A two-stroke generator is not recommended to load less than 30% of the rated power.
Other owners of equipment can assure you: "so I ran it in - and everything is fine with me." Of course, you can believe them ... This is your right. And you can even run it yourself in this way ...
But the correct "break-in" of a modern two-stroke engine is a little different:
1. Break-in is the operation of the engine during which all rubbing parts are rubbed.
2. Break-in must NOT be carried out at idle.
3. Break-in time (grinding in parts) is the time it takes you to burn 1-2 fuel tanks of your tool.
4. During the break-in period, it is recommended to prepare the fuel mixture with a little more oil. If you usually use a mixture (manufacturer recommends, indicated on the oil bottle) 1:50, then during the break-in, prepare a mixture of 1:40.
5. And most importantly! Work (Attention!!! Exactly work!!!) with the tool without overloading the engine! If it is a saw, then sawing boards, slabs or something similar, and not felling a tree with a diameter of more than a third of the length of the tire. If it is a mower, then mow using a trimmer head with the recommended line size. Mow not tall grass, not bushes to the waist. If the generator - then do not give the maximum load.
6. At the same time, it is recommended to reduce the operating time without a break for the break-in period and allow the engine to cool down.
After such a break-in, it is recommended to check all threaded connections, tighten everything that is loose.
And important! If you have any suspicions that your new engine is not working properly, the carburetor does not develop speed or something like that: do not under any circumstances try to adjust the carburetor yourself. Unauthorized attempt at self-repair may void the warranty. Contact an Authorized Service Center.
Recommendations for the initial stage of running-in
The run-in is divided into several stages: preparatory, run-in itself, final. At the preparatory stage, you need to make sure that the bar and chain are lubricated. Moreover, special oil is used for lubrication. Do not break-in at idle speed, otherwise it may lead to tool breakage, since oil is not supplied to the chain.
A common question is: "How long should I run in?". Running in a chainsaw lasts 5-7 hours. Upon completion of this process, the remaining fuel mixture must be drained and filled with a fresh portion. It is not recommended to give the saw the maximum load during the first 5 refuelings, and also to exceed the standards for the diameter of the logs set by the manufacturer.
Stihl 180 chainsaws - malfunctions and repairs
The simplicity of the Stihl MS 180 household chainsaw allows its owner to fix most of the tool’s malfunctions with his own hands. To successfully repair the model, first of all, you need to determine the causes of the breakdown. The repair algorithm in each individual case is different and depends on the type of malfunction.
The reason for not starting the Stihl model, in this case, is the filling of the spark plug.
To fix the problem, you will need to disassemble the upper part of the tool and unscrew the candle. If a thick layer of soot has formed on the candle, it will need to be cleaned and dried. After that, a clean candle can be screwed back.
If the tool is used frequently, one of its fuel tubes may break, which will cause fuel to enter the spark plug and other parts of the saw.
In the event of a break in the fuel pipe or a hole in it, the owner of the tool will need to remove the damaged hose and replace it with a new one. In this case, the junction of the new hose with the factory fitting must be carefully treated with a sealant.
One of the main causes of the problem in which no oil is supplied is a breakdown of the pump supplying oil to the saw set. To fix the problem, you will need to remove the bar and chain, as well as dismantle the side protective plastic cover. After that, the place under the housing will need to be cleaned and the pump replaced.
If the chain is not lubricated, then the cause of the breakdown may also be a break in one or more oil pipes. In this case, the hoses will need to be removed and replaced.
In this case, the cause must be sought in a contaminated air or built-in fuel filter. Over time, they become unusable, as dirt accumulates on them. To fix the problem, you will need to clean or completely replace the filter parts.
Another reason for this failure lies in an incorrectly tuned carburetor. The owner will need to pre-clean the assembly from accumulated dust and oil residue, and also configure it according to the manufacturer's instructions.
In this case, the cause of a sudden breakdown must be sought in the ignition system of the tool. Often, during mechanical shocks, the gap between the flywheel and the factory ignition coil is broken, which leads to a breakdown of the entire system. In this case, you will need to disassemble the tool and check the distance between the elements.
To adjust the gap, you need to loosen the flywheel mount. After that, you will need to insert a template between the flywheel and the ignition coil, and start screwing the bolts back. As soon as the flywheel comes into contact with the template, screwing in the bolts must be stopped.
First you need to make sure that the spark plug is not flooded with fuel. If a thick layer of soot has formed on it, then you will need to inspect the fuel system. It could lose its tightness as a result of a broken hose or a broken fuel pump.
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If everything is in order with the candles, then you need to check the air filter. As a result of intensive use of the chainsaw, it could become clogged or become unusable. In this case, cleaning the filter or replacing it will help.
The third element that could fail is one or more compression rings. They are not repairable and will need to be replaced.
