You will need
- - technical passport of the chainsaw;
- - screwdriver;
- - a set of wrenches.
Read the rules of operation of chainsawslisted in the technical manual. Before you start self-adjustment the carburetor on a new saw, remember, what are the factory settings. It is not recommended to make changes to the carb, until the engine and spend a few hours with the settings exposed by the manufacturer.
Start the adjustment at idle. Start the engine and let it run at low speed. Using the adjusting screw at the carburetor until the engine has gained momentum steadily, and the chain was not moved on the bus.
Go to medium speed. If the engine begins to smoke, partially tighten the screw, which will make the mixture poorer. Smoke after depletion of the mixture must cease and the engine speed will increase. Make with a sharp press on the throttle lever the engine picked up speed quickly and smoothly.
Check the engine response of a saw. Set the minimum rpm, which would need to Unscrew the adjustment screw. Now sharply push the lever to the end and soak it in this position for at least three seconds. If the engine stalls or is too slow increase the speed, gradually remove the screw. Selecting the optimum mode of operation to securely fix the adjusting screw lock nut.
For newly purchased saw, not tuned for maximum power and not the last run-in, also adjust the carb, consistently changing the position of the screw carb. Remember that by unscrewing the mixture screw is enriched, and in case of partial screwing it becomes poorer.
A final adjustment of the carburetor are produced after three or four hours of chainsaw in a real work environment, that is, when sawing wood.
Advice 2: How to adjust the carburetor of a chainsaw
For a flawless and long-term operation of a chainsaw is required to periodically adjust the carburetor. This should be done taking into account the specific brand of your device, and standard parameters specified in the technical manual supplied with the saw. The correct adjustment of the carburetor will depend on the efficiency of the entire technical system.
You will need
- - the manual of a chainsaw;
- - tachometer;
- - screwdriver.
Check device chainsawset forth in technical documentation for it. Determine the location of the jets of the carb and the adjustment screws. The standard carb has usually two or three screw controls the fuel mixture adjustment screw idle speed, and screws the jets high and low speed.
To adjust high and low engine speed saw, use the appropriate screws. They regulate the ratio of fuel and air that is determined by the degree of throttle opening. For the lean mixture screw in the corresponding screw clockwise. If necessary, increase the engine speed (i.e. richer mixture), remove the screw by rotating it counterclockwise.
Adjustment of idling speed is also carried out by rotating the right screw. Turn the knob in the direction of clockwise to increase the frequency of idling. To reduce engine speed slowly turn the screw in the opposite direction.
When adjusting the carburetor , keep in mind that the initial stage of operation of a chainsaw is necessary to keep the factory settings. Exposed the factory settings are calculated for a richer mixture. After hours of work the saw can begin to self-adjust the carb.
Run the saw at full speed for 10-20 seconds. Then, Unscrew the needle valve the high speed counterclockwise. Ten seconds with a tachometer check the maximum engine speed and contrast the findings with those specified in the technical passport of the device. Too lean makes the saw "scream"; the excessive enrichment of the mixture of smoke from the muffler.
Observe when you change settings caution since a sharp change in the number of high speed greatly affects the power device and the rotation speed of the circuit. The depletion of hot mix leads to unnecessary, excessive rpm, which can lead to damage to the chainsaw down.
Advice 3: How to adjust valve on a 402 engine
In order to compensate for thermal expansion valves, an engine design that provides clearance between end of valve stem and camshaft lobe. If this gap is higher than normal, the valve will not fully open if below normal – the valve is fully closed.
You will need
- - set of automotive tool;
- - bladed feeler gauges;
- - ratchet wrench crankshaft.
The adjustment of thermal backlashes between the rocker arms and valves spending on a cold engine ZMZ-402. While retaining nuts to the cylinder head and stands the rocker arm shaft should be tightened with the necessary force. Remove the air filter housing and carburetor. Disconnect the outlet pipe of the crankcase gases. Disconnect the pipeline of a vacuum regulator of the gauge-allocator of ignition.
Remove the cap from the valve rocker arms (the cover of the head unit) by unscrewing the 6 screws of its fastening. The piston of the first cylinder set at top dead centre (TDC) of compression stroke. To do this, rotate the crankshaft until the third mark until its pulley aligns with the pointer on the gear cover. The rotation of the crankshaft of spending by special key installed on his ratchet.
Make sure that the intake and exhaust valves in the fully closed position and the rocker valve can be turned freely. Check with a feeler gauge the clearance between the rocker arm and the valve. The clearance for all intake valves must be 0,4-0,45 mm. the clearance for the exhaust valves of the first and fourth cylinder shall be 0,35-0,4 mm, for the second and third cylinders of 0.4-0.45 mm. With normal clearance the probe should enter into the gap with little resistance.
If the value of the thermal gap requires adjustment, loosen the locknut on the adjustment screw with a suitable wrench. A second key hold the adjusting screw against unintentional turning. Gap adjust the slow rotation of the adjusting screw with simultaneous continuous control of the magnitude of the gap. After finishing the adjustment, tighten the adjusting screw lock nut. Again hold the key against accidental displacement. Re-check the gap. In the same way, adjust the clearance of the other valve of the first cylinder.
Rotate the engine 180 degrees and adjust the valve clearances on the first cylinder using the above steps. Then rotate the crankshaft another 180 degrees and adjust the clearances of the valves of the fourth cylinder. Then again rotate the crankshaft 180 degrees and adjust the valve clearance of the third cylinder.
Advice 4: A chainsaw or chain saw: it is better to choose for the building?
Summer residents and owners of country houses it is often necessary to perform different work on wood. Of course, chop firewood or cut down small knots on the tree with an ax or handsaw. But if you need to put the log or to cut down an old tree, you need a reliable petrol or electric saws.
Mobility and portability
The main advantage of chainsaw – portability, it does not depend on electricity, it can be used anywhere. However, to make it work, it will take time because you need to pre-dilute the fuel mixture. To work with the chainsaw in all weather conditions, but at low temperatures it is difficult to make.
The main advantage of the electric saw is easy to work with it. However, in some cases, such as high humidity and in the rain, its use is not recommended. With an electric saw, you can work indoors, she, unlike the chainsaw, it does not emit exhaust gases.
A big drawback of electric saws is dependent on the availability of electricity. If you intend to use it for outdoor work, you will have to take care of the extension cable.
The power and scope of use
Saws are of the household tools they are compact, their weight is usually less than the weight of any chainsaw. If you compare the power, according to this criterion, the household electro - and chainsaws are virtually identical. But semi-professional and professional chainsaw order of magnitude more powerful than any electric model.
Chainsaw indispensable for the implementation of works on construction of the house, and a professional model saws to be used for working with frozen wood.
For thick timber it is best to choose a chainsaw, and for the implementation of minor works will fit the electric model, which can be used exactly to cut even thin boards.
In the implementation of works using the appliance it is recommended to take a break every 20-30 minutes to allow the engine to cool down.
Features care and maintenance
Work with any tool requires certain skills and knowledge. To understand the features of the care tool, it is necessary to know its structure and working principle. Then during operation, you can avoid unpleasant situations, including injuries.
About the care of a specific tool is written in the instruction manual. But there are common elements. Choice of chain and tire depends on the model of the saw and the work performed. For petrol and electric saws, you must choose a special lubricating oil for chain, and chain saws it is necessary to purchase gasoline (usually 92 Ron) and motor oil (usually two-stroke semi-synthetic or mineral) for the preparation of the fuel mixture.
Operation of chainsaws, as a rule, more expensive.
Thus, the characteristics of the different models of saws, we can conclude that the choice of saw depends on the type of planned works and their fulfillment.