Why a chainsaw won’t start when it’s hot
Why the chainsaw won’t start Causes and remedies. How the mechanism is set up
Almost all tools, both foreign (Husqvarna, Makita, STIHL, Partner 350), and Chinese chain saws, and domestic (Druzhba, Ural), are arranged similarly. So it’s not hard to find the reason why the machine won’t start or why it shuts down.
There are four elements where problems can occur:
- Fuel, for which the carburetor is responsible ;
- The air that comes through the air filter;
- The spark whose quality depends on the ignition unit.
They all depend on each other and interact with each other. If one of these two elements malfunctions, the saw stops working.
To begin with, all tools start differently. hot and cold. This is made possible by two mechanisms that are often used.
Be sure to see what is written in the owner’s manual. It says to make sure that the emergency stop brake is engaged. But it is much harder to start a saw with a brake, so sometimes it is better not to engage the brake.
As you can see from the instruction manual, inside the body there is the fuel tank and the engine and outside there is the saw part (guide bar with chain), the handle and the starter.
First you need to figure out exactly how the tool does not start. For example, the saw starts, but immediately stops working, or loses power, the quality of the cut.
Perhaps the interruptions are due to problems in the engine. But I would not recommend to immediately disassemble it. It is better to look for the problem from the simplest version.
It is very important to consider the quality of the fuel. If the mixture is prepared incorrectly or has deteriorated over time, even such reliable tools as the Ural or Husqvarna 145, will not work. The manual is sure to indicate the proportions and special oil specifically for your chainsaw.
Another common problem is that the user fills the spark plug during startup. It should be inspected, if it is completely dry, it means that the fuel does not flow into the cylinder.
If you see black fouling or a lot of fuel, the carburetor may not be adjusting the fuel supply properly.
If your saw starts but immediately stops, the problem is in the carburetor nozzle or the fuel filter. They may be clogged.
To check for damaged breather plug, disconnect the fuel hose from the carburetor and check for leaking fuel mixture.
If your saw won’t start when hot, the problem may be in the muffler. Sometimes it gets clogged from the exhaust itself.
Quite often the failure of the saw happens because of a small amount of chain lubricant. This could be due to clogged pipes or a leaking oil pipe.
Also inspect the tube connections to the oil pump fittings to see if they are leaking.
Very bad when the failure occurred in the cylinder. When examining it you can find bumps or chips, and this can be the cause of the problem.
Why won’t the STIHL 180 chain saw start when hot? s
STIHL 180 chain saw does not start? Prerequisite and Solution!
Today the manufacturer STIHL takes a leading place among other companies that create the production of equipment designed for agricultural and construction works. Products of this manufacturer is known not only for its high level of quality, but also a good pricing policy and capacity of its models. This is one of the most recognized global companies.
Surely, quite difficult to meet a man who would not have had a chain saw brand. But the fact that out of 10 likely people, 6 people definitely have them. Why a chainsaw won’t start if it won’t start. Reasons why you can’t. This is not unreasonable, because STIHL chain saws are as powerful as they are elegant. But unfortunately, and such giants of technology from time to time break down and require a certain kind of repair. Now we are going to focus on one of the models of this manufacturer, namely the STIHL 180 chainsaw. WINTERSTEIGER STARTING Bad chain saw in the cold. Read about the STIHL ms 660 chain saw here. Here we go.
Replacement of the oil seals on the crankshaft of the Chinese chain saw. Replacing oil seals on a chainsaw: STIHL, Ural and others
Today, many users can not do without a quality chainsaw, because in domestic tasks it helps to cope with various wood, branches and cutting firewood. So the tool should always be in good condition, which requires timely diagnosis and repair of the right element.
Depending on the model used, parts and small glands may be of different quality. Replacing the oil seals on the crankshaft and other components is a responsible thing to do, even if it takes a minimum of time. Oil seals are made of high-strength rubber, but over time they leak and need to be replaced in a timely manner. When the oil seal cracks or becomes defective, oil begins to leak, causing damage to the entire engine. So when a problem is detected, quickly replace with a similar part.
Every chainsaw regardless of brand or price has the same construction, so more often the oil seal will leak in the crankshaft area. The oil seals are also located in all of the saw’s rotating mechanisms, so check them if possible. If you know a little about chain saw construction, getting to the stuffing box is not difficult. Simply remove any items that are obstructing access to the crankshaft oil seal.
Note: there are two oil seals on the crankshaft. one at the beginning of the crankshaft and one at the end. The part reliably seals the inside of the engine, covering the bearing. Without the oil seal, oil will leak in all directions, so you can tell when it’s broken by oil leaks from the crankshaft.
How to remove the crankshaft oil seal on a STIHL chain saw?
Regardless of the make or design of the chainsaw, you follow a similar process for removing the oil seals. When you get to the broken part, carefully remove the packing. There are several ways to do this:
- With a special puller, but make sure that the oil does not come out of the crankcase;
- A cheaper and easier way is to forge the gland from the groove with a sharp object;
- If the part is firmly seated and its size is sufficient, you can go the old tried-and-true way. screw a self-tapping screw into the gland and pull it out with pliers.
It is not necessary to take care of the old stuffing box when removing it, but the main thing is not to damage other parts of the chainsaw. If we are talking about brand-name, it is better to perform the work in specialized services. It is also better to buy the original stuffing box, experience shows that cheap analogs quickly begin to leak.
It’s quite easy to fit a new packing, just press it into the seating hole with a wire puller or something else. The main thing is to make sure that it fits evenly and does not stick out. Also you need to be very careful when doing this, because the rubber part can be damaged. The dimensions of chainsaw oil seals can be specified in the old model, or they can easily be picked up by the model of your chainsaw. As you can see, the replacement is not difficult, similar to the other oil seals.
How to repair your chainsaw throttle grip. Dismantling and reassembling a chainsaw with your own hands
The low level of technical equipment of many service stations and the high cost of their services, forcing many owners of faulty chainsaw equipment to repair their gadgets on their own. How to disassemble your chainsaw, replace faulty parts, and properly reassemble your chainsaw with minimal time and expense?
Self-disassembly of a chainsaw requires spare parts, appropriate tools and locksmith skills. It is possible that the dismantling of individual parts will require special pullers, the manufacture of which will take more time than the repair itself.
In a number of modern models of domestic and semi-professional chainsaws for the removal of the chain drive sprocket special wrenches, which are not included in the kit, are used.
Problems of do-it-yourself repairs
The problem in many cases is complicated by the lack of complete information on the repair technology. According to foreign manufacturers, after reaching the end of its life the saw has to be scrapped. That’s why practicability of many budget models raises reasonable doubts.
Professional chainsaws are more difficult to repair.
- The problem is complicated by the high cost of spare parts.
- It is possible that in order to restore the performance of individual assemblies and mechanisms, in particular, to adjust the fuel equipment will require special equipment.
The replacement of expensive brand-name parts by affordable, but short-lived Chinese counterparts in economic terms is not justified. Practice shows that these components have a service life of 50-60% at best.
The cause of a saw’s failure or performance deterioration can be:
- Clogged fuel filler cap breather;
- Carburetor air intake due to gasket failure or loose threaded fasteners;
- mechanical galling of the removable saw equipment and other minor faults.
Before you begin disassembly, make sure you have more extensive repair work to do.
You will most likely not be able to reassemble a new chain saw of the same quality as it was originally designed. In the design of modern chainsaws often used press fit mating parts, which have minimal repairability.
Even a partial disassembly of a chainsaw with improvised tools can lead to the following undesirable consequences. In most cases, to fix the problem you can only dismantle the individual unit or system.
Tips for disassembling different assemblies and systems
In the volume of this article, we can give only general recommendations, because chainsaws from different manufacturers may have significant technical differences.
Before disassembling the faulty tool, it is necessary to dismantle the saw headset, drain fuel and oil from the fuel tanks, clean the hard-to-reach places of the chainsaw from surface contamination.
Fuel Supply System
Particular attention is required to disassemble the carburetor. This assembly consists of many small parts, so the removed parts are stacked in a given order on a blank sheet of paper. After washing all the components, the carburetor is assembled in the reverse sequence.
Restoration of compression
Less complicated repair of the piston group. To disassemble the cylinder, simply remove the threaded fasteners, lay the saw on its side to prevent pieces of a destroyed compression ring, piston skirt or other foreign objects from getting into the engine crankcase.
The mirror of the cylinder wears unevenly, so installing a new piston has no significant effect. As a rule, during overhaul, after checking the suitability of the crankshaft a complete set consisting of the cylinder, piston compression ring and piston pin is installed.
Repair of triggering device
Dismantling the starter to replace the cord for an experienced user does not create problems, but the plastic housing in most cases, the repair is not possible.Most are copies of the most popular European models, so we disassemble the Chinese chainsaw according to the standard scheme.
Worn components in the saw headset cannot be repaired.
- It is possible to shorten the new chain at home to fit a shorter bar.
- The resource of the branded components of the bar is equal to that of three saw chains.
- This can be drastically reduced by wrong chain pitch or heavy wear of the sprocket drive ring.
In a number of models, the elements of engine control, start blocking and the emergency stop system are brought out to the handles, to the place where the operator’s hand grabs. It is recommended to assemble the chainsaw handle after first cleaning the contacts of all electrical and mechanical communications.
Self-assembly of a chainsaw is a part of the repair work that requires special attention. Proper sequencing of operations, sufficiently high quality of parts, gaskets, and other consumables contribute to the success of the end result.
Chainsaw throttle handle repair. Dismantling and assembling the chainsaw with your own hands
The low level of technical equipment of many service stations and the high cost of their services, forcing many owners of faulty chainsaw equipment to repair their gadgets on their own. How to disassemble a chainsaw, replace defective parts, and properly assemble the chainsaw with minimal time and money?
Independent disassembly of a chainsaw requires spare parts, appropriate tools and locksmith skills. It is possible that to dismantle individual parts you will need special pullers, which will take more time to make than the repair itself.
Some modern models of domestic and semi-professional chainsaws use special wrenches for disassembling saw chain drive sprocket, which are not included in the delivery set.
Problems of self-repair
The problem in many cases is complicated by the lack of complete information on the technology of repair. According to foreign manufacturers, after reaching the end of its life the saw should be scrapped. That’s why serviceability of many budget models is quite questionable.
Professional chainsaws are more difficult to repair.
- The problem is complicated by the high cost of spare parts.
- It is possible that special equipment will be required to restore the functionality of individual assemblies and mechanisms, in particular to adjust the fuel equipment.
Replacement of expensive brand-name parts by affordable but not durable Chinese counterparts is not economically feasible. Practice shows that these parts service life is at best 50-60%.
Fault location algorithm
The cause of a saw’s failure or a deterioration in its performance may be:
- Clogged fuel tank lid breather;
- Carburetor air intake due to a damaged gasket or loose threaded fasteners;
- mechanical jamming of removable saw equipment and other minor defects.
Before you start with disassembly you must make sure that more extensive repairs are necessary.
To assemble independently a new chain saw after repair with the original quality, most likely, it will not be possible. The construction of modern chainsaws often uses press fit mating parts, which have minimal repairability.
Even a partial dismantling of the chainsaw with improvised tools can lead to undesirable consequences. In most cases, the troubleshooting can be limited to removing a single component or system.
Tips for disassembling different assemblies and systems
In the volume of this article we can give only general recommendations, since chainsaws from different manufacturers can have significant technical differences.
Before disassembling the faulty tool, it is necessary to dismantle the saw headset, drain fuel and oil from the fuel tanks, clean hard-to-reach areas of the chainsaw from surface contamination.
Fuel Supply System
Particular attention should be paid to disassembly of the carburetor. This unit consists of many small parts, so the removed parts are stacked on a clean sheet of paper in a given sequence. After flushing all the components, the carburetor is assembled in the reverse order.
Less complicated repair of the piston group. To disassemble the cylinder, it is sufficient to remove the threaded fasteners, lay the saw on its side to prevent pieces of a destroyed compression ring, piston skirt or other foreign objects from getting into the engine crankcase.
The cylinder mirror wears unevenly, so installing a new piston does not have a significant effect. As a rule, during overhaul, after checking the suitability of the crankshaft is installed a complete set, consisting of a cylinder, piston compression ring and piston pin.
Repairing the starter
Disassembly of the starter to replace the cord for an experienced user does not create problems, but the plastic housing in most cases, can not be repaired.are mostly copies of the most popular European models, so we disassemble the Chinese chainsaw according to the standard scheme.
Worn components in the saw system cannot be repaired.
- The new chain can be shortened at home to fit a shorter guide bar.
- The life of the branded bar accessories is equal to the life of three saw chains.
- Improper choice of chain pitch or excessive wear of the drive sprocket rim can significantly reduce this indicator.
In some models, the engine controls, starting interlock and emergency stop system are brought out to the handlebars, the place where the operator’s hand grabs. It is recommended to assemble the chainsaw handle after first cleaning the contacts of all electrical and mechanical communications.
Self-assembly of a chainsaw is a part of the repair work that requires special attention. The success of the final result is facilitated by a correct sequence of operations, a sufficiently high quality of parts, gaskets and other consumables.
Chainsaw carburetor adjustments and chinese tools device
The carburetor in internal combustion engines is responsible for preparing the fuel mixture. It consists of gasoline, air, and oil. When all of these ingredients have been used in the wrong proportions. The engine will not run smoothly. To prevent this and need to adjust the carburetor chainsaw.
Operating principle of a carburetor
Regardless of the chainsaw manufacturer, the procedure and principles of carburetor operation remain the same. This device consists of several basic elements:
Under atmospheric pressure the air, after passing through the pre-cleaner, enters the narrower part of the tube where its flow is regulated by the flap. Also here the air becomes discharged and the resulting vacuum draws combustible fluid from the fuel line. A special needle connected to the nozzle chamber is used to adjust the fuel flow. The quality of the fuel mixture is regulated by the choke. as the air opens more fuel enters the carburetor and the power of the power plant increases.
To avoid problems with the operation of the tool, it is necessary to periodically adjust the chainsaw. If too much air is thrown into the mix, it becomes lean and the engine output diminishes. A lack of air also has a negative effect on the unit’s performance, as fuel consumption increases. At the same time, it does not burn completely, which leads to the appearance of soot on the walls of the cylinders. It is quite obvious that the question of how to adjust the carburetor on a chainsaw, many owners of this tool ask.
However, first it is worth noting the signs of quality work of the power unit:
- RPMs are quickly dialed in.
- The sound when running the engine is similar to a four-stroke.
- No cranking of the chain is observed at idle speed.
Situations in which a tune-up is necessary
The new tool is already prepared to work. In this regard, for some time the question of how to adjust the carburetor on the chainsaw will not arise. However, experienced owners of the unit often make fine-tuning. To do this, there is absolutely no need to disassemble the carburetor, as its design provides for three adjusting screws:
- L. used at low rpm.
- H. allows you to adjust the maximum flow of combustible fluid.
- T. necessary for adjustment at idle speed.
All fine-tuning is done by ear, and at this time, safety rules must be adhered to. Before starting all manipulations, the adjustment screws should be marked so that it is easier to return to the default setting if necessary.
The most common problems occur when adjustments are made after machine malfunctions. Among the main causes of their occurrence it should be noted:
- Screws are out of balance and the protective cap is misaligned.
- Wear of the piston system, which requires changes in the fuel mixture.
- Problems with the carburetor itself.
All carburetor chainsaw tuning work is done in four steps:
The adjustment of the engine for its smooth operation at low revolutions is performed.
- The carburetor is adjusted to create and supply a quality fuel mixture.
- The fine adjustment is carried out at idle and only after the power plant has warmed up.
- Check the quality of the tool in all modes of operation.
Now for more details on how to adjust the chain saw. If the tool does not start, the screws H and L must be returned to their original positions. Then start the engine and let it warm up. Then the tool can be adjusted at a lower speed. The L and T screws are used to achieve optimum performance.
The first thing to do is to set the engine into maximum rpm with the screw L and then release it at ¼ of the rpm. The T-handle allows you to adjust the throttle trigger when idling. The traction and the maximum rpm adjustment is done with the H screw, which should be turned slowly while looking at the electronic tachometer. It is important to remember that you can not exceed the maximum number of revolutions declared by the manufacturer of the tool.
After the adjustment procedure you need to let the engine cool down. Then restart it according to the cold-start algorithm. If there are no problems at this time and the chain saw is running well when idling, check under load. If you find a lack of power in the power unit you adjust it with the H screw.
Almost all Chinese chain saws are equipped with carburetors, the construction of which is similar to the European models. There is little difference in the settings. for the first adjustment the H and L screws need to be turned two revolutions. All of the following steps remain unchanged.
At the first signs of loss of power (decrease in rpm) STIHL chainsaw MS 180, under no circumstances should you continue to work, and you should immediately contact a specialist or conduct a diagnosis and fix the problem yourself. There are not many reasons for power loss and it is possible to cope with them even without certain skills. The main thing is to analyze calmly the saw’s behavior and find out the reasons why it stopped pulling (the speed has dropped), and to eliminate the fault is not complicated.
This defect most often indicates malfunction of fuel and other systems of a chainsaw. There is no single cause of this failure, since the random increase in rpm of a running engine can be the result of a defect in several different assemblies at once.
The first thing the operator needs to do is to inspect the fuel system parts. Quite often the chainsaw engine will independently gain speed when the settings of fuel supply in the standard carburetor are disturbed. In that case you need to remove the unit, disassemble it and wash it with pure gasoline. After it has dried, you need to put the carburetor back in and make adjustments.
Next, you need to inspect the condition of the fuel filter. If the chainsaw has been operated for an extended period of time, the fuel hose may be damaged. As a result, fuel will enter the cylinder unfiltered, with large amounts of impurities and fine chips. This can damage the engine and cause it to seize. As a result the chainsaw will randomly pick up speed immediately after starting its engine.
The next step is for the operator to inspect the fuel pipes. They should be in their proper seats and, most importantly, have no holes in their walls. If there are any, the fuel hose will need to be completely replaced.
Another cause of randomly increased rpm is a jammed throttle lever. If the operator often pressed it with dirty gloves covered with oil, grease particles might leak into the lever and stick to its surface. As a result, the lever itself will begin to stick to the walls of the housing, giving the engine a command to pick up speed. The problem can be solved by disassembly and subsequent cleaning of the chainsaw body and throttle lever.
How to wash the carburetor chainsaw?
You can clean the carburetor on the chainsaw with any aerosol cleaner. The best proven products are brands Mannol, Hi-Gear and Nowax. These compositions well clean the walls and carburetor parts from accumulated dust, carbon deposits and hardened tar.
Both Chinese and German carburetors are flushed in the same sequence.
Cleaning the carburetor on the chainsaw is performed in the following order:
- At first it is necessary to drain the used fuel remaining in the fuel tank. Next, you need to unscrew the mount and remove the protective cover of the chainsaw body, as well as remove the regular air filter;
- Next, you need to remove the hose responsible for the fuel supply. To do this, you will need to open the locks. After that it is necessary to unscrew the fasteners and remove the upper cover of the factory unit housing;
- Next, you will need to remove the cover with a blue gasket, acting as a diaphragm fuel pump. Next to the body are the brackets in the form of springs. It will be necessary to remove them, as well as to remove the screws;
- Then you need to unscrew the screw and carefully remove the needle valve. Directly underneath is the built-in spring, which must also be removed. After that it is necessary to pull out the slide and the standard axle, carefully pulling them towards you;
- After that it will be necessary to remove the drive lever, as well as the throttle valve and its factory axle;
- All extracted gasoline chainsaw carburetor parts will need to spread on paper and check their integrity. If necessary, worn parts must be replaced;
- Next, all dismantled parts should be washed with a spray can. The same thing should be done with the float chamber and the carburetor body.
- After complete drying, all parts must be installed in reverse order.
After flushing, the carburetor will need to be installed in its original place in the chainsaw. Next, the garden tool will need to start and observe his work at idle and maximum speed.
Why does the chain saw quit in heat?
It is not uncommon for a chainsaw to start when cold, but to stall as it heats up. Such behavior of the tool can be caused by the following reasons:
- The carburetor is not set correctly. You can see the problem by looking at how the machine is started when it is cold. If it is made without closing the air damper, and the motor starts without a preliminary flash, then it means that after heating the motor, the fuel floods the spark plug. This problem can be solved by adjusting the carburetor. Read more about carburetor adjustment
- Coil (ignition module) malfunction. It is possible to find out the given malfunction by sequentially checking the spark plug on the cold engine first and then on the hot one. If there is no spark on a hot motor, you need to replace the ignition coil.
- Failure of the spark plug. In this situation, as with the ignition module failure, the spark disappears when the engine warms up. It is necessary to replace the spark plug with a new one, and if this does not solve the problem, the ignition module and the distance between it and the flywheel should be checked.
Problems “On Hot
If you notice that the chainsaw has no problem starting without warming up, and after warming up it stalls. And it will not start until it cools down, then here, there may be several problems.
First, there may be a hose, packing or gasket leak somewhere. Secondly, inspect the muffler for fouling. The third reason is in the cylinder-piston group (CPG), there are no scrapes or irregularities.
Sometimes the carburetor needs adjustment. Another important cause of malfunction, is the ignition coil. In the cases when it malfunctions the spark is lost or becomes very weak, which is not enough for ignition of the fuel mixture.
There are known cases when the master is trying the engine hard, then on cold, then on hot, thereby pumping fuel. Here you need to take hold of yourself, move the flap to the “hot start” and gradually start the tool. In this case we bring down the revolutions to practically idle level and for 40-45 seconds it warms up.
Detection and elimination of obvious chainsaw malfunctions.
To determine the reason why the chainsaw does not start or stalls when starting, it is necessary to make a defect inspection of the tool. The essence of the procedure is to consistently inspect the condition and operation of the main working elements of the saw’s engine. At this stage we check:
- The presence of spark on the spark plug;
- Fuel supply;
- Condition of the filters;
- Operation of the breather built into the fuel cap of the stalling unit;
- Functioning of the exhaust duct.
Check spark plugs and eliminate causes.
The first step in finding out why the gasoline-powered saw will not start is to check the spark plug spark. There are many factors that affect the performance of this element. However, the main ones at the initial stage of tool defecting are:
- Improper adjustment of the carburetor;
- The presence of more oil in the gasoline than it should be;
- The air filter is clogged.
They all contribute to fouling of the spark plug electrodes. In 50 times out of 100 cases, cold chain saws do not start because there is no spark, because of fouling or corrosion of the electrodes. The result is either a decrease in the gap or an increase in the gap.
Checking spark plugs on a nonfunctioning chainsaw
It is quite easy to check if the spark is present. This will require:
- Remove the tip of the high-voltage wire;
- Unscrew the spark plug;
- Put the tip back on;
- Lean the spark plug with the skirt on the cylinder;
- Start with the starter.
If the chainsaw engine starts with a good spark between the electrodes, there is nothing wrong with the ignition unit. If it is not there, it is worth cleaning the element itself and checking the gap of the electrodes. If necessary, use a special probe to adjust the distance between the contacts.
The distance between the electrodes can vary from manufacturer to manufacturer. Some may have a contact gap of 0.5 mm. Others have 0.2 mm. For this reason, carefully read the manufacturer’s recommendations.
There may be no spark on the spark plug for other reasons, too. Among the main malfunctions that affect poor starting of a chainsaw and unstable engine operation at idle, from which the tool can stall, the following can be attributed:
- The spark plug channel is overfilled with fuel;
- Lack of contact between the high voltage cradle and the spark plug tip;
- Failure of the ignition unit.
How to start a cold chainsaw, if the spark plug passage is constantly filled with gasoline? Eliminate the problem at the time of starting the tool, you can use the following algorithm:
- Unscrew it with a special key;
- Wipe it with a clean and dry rag;
- Dry it for 20 to 30 minutes;
- Remove the soot with a file and adjust the gap between the electrodes;
- Drain the residual fuel from the spark plug duct and dry it;
- Reassemble everything and try to start the mechanism.
As a rule, these measures are enough to start the chainsaw and get the job done. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls. improper operation of the carburetor, which needs fine adjustment.
In the case of no spark, if the high-voltage cradle has poor contact with the spark plug tip, it is necessary to check the connection. This can be done with a fiber optic tester. Upon detection of the defect and its elimination, the chainsaw should start without much trouble.
If the check shows that the contact is reliable and the saw still won’t start, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired or repaired. Here it is necessary to change it completely.
Checking the fuel supply and presence of fuel.
First you need to make sure that there is a fuel mixture in the tank of the chainsaw that does not want to start, and it is flowing properly into the carburetor. If the tank is full, check the fuel system’s fuel line. Disconnect the fuel pipe from the carburettor and try to pump. In the case of a complete order, when pumping up, the gasoline will be jerky in accordance with the standards set by the manufacturer. Weak fuel supply or its absence can be a consequence:
If the chain saw does not start well, it is often because the tank is too full. In this case it is worth paying attention to the presence of leaks under the saw’s crankcase cover. If they are present, look at the connection of the gasoline supply tube to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, tucked under the neck, which prevents the engine from starting.
The quality of the fuel mixture may also be one of the reasons why a chain saw does not start. If you do not drain the gasoline and leave the tool for a long time (more than 2 weeks), tarring and polymerization of components will begin inside the tank. This can cause fouling of the piston, rings and cylinder liner. So always mix only as much fuel as necessary before starting.
Check the condition of the fuel and air filters.
If the fuel quality is okay, your chain saw might still not start if the fuel and air filters are clogged. To diagnose these elements it is necessary to perform a number of manipulations connected with their disassembly.
If there is little or no pressure in the nozzle, disconnect the filter. Before doing this, empty the tank from the mixture and remove the filter element. Dismantle it with a wire hook. A clogged removable cartridge, which causes a bad start of the chain saw engine, can be cleaned, but it is better to replace it with a new one. If using the tool in dusty conditions, it is a good idea to clean it regularly.
A clogged air filter can cause the chain saw’s engine to rattle, making it hard to start or choke. Dust and dirt on the adsorbent material obstructs the airflow in the system and makes the fuel mixture so enriched that starting the tool is sometimes difficult.
What to do if the chain saw won’t start again?
If the initial inspection was inconclusive or the faults were corrected but the chain saw still fails to start, you need to look for more serious causes. It is best to have these problems checked and repaired by a service outlet. However, with experience, you can find and fix them yourself. What to Diagnose and Check?
In the first case, checking the compression in the cylinder will clarify the state of the cylinder piston group (CPC) chain saw does not want to start in the cold. For this you need a compressometer. The device is screwed in place of the spark plug and the engine is idle started. Measuring the readings gives an indication of the condition of the cylinder head. If a compressometer is not available, the compression in the cylinder can be determined at a glance as follows:
By putting a finger on the spark plug hole and twitching the starter, you can check the compression in the cylinder
If you feel that the finger strongly retracts into the candle channel, then the compression is all right. If there is no vacuum in the chamber, this indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of the state of the piston and cylinder, piston rings and bearings.
The chainsaw can also fail to start in cold conditions due to lack of compression in the engine crankcase. The main reason for this is damage to the gasket placed between the cylinder and the crankcase. Detecting lack of compression is fairly easy:
- Disconnect the upper tube from the carburetor;
- Pour gasoline into the regular plug;
- Dip the removed tube into the fuel;
- Pull the starter a few times.
If the fuel from the cap sucks in when the chainsaw starter starts, there’s nothing wrong with the compression. If not, check the gasket.
If the fuel retracts, everything is fine. the gasket is intact. Otherwise you will have to buy a repair kit and make a replacement. How to do it see the video, why the Chinese chainsaw does not start:
Starting the tool can be complicated by improper operation of the carburetor or its failure. It often happens that during the sawing process, the fastening screws are loose and air is sucked into the cylinder. Check that the carburetor is securely fastened. Check for fuel leakage in the crankcase. There can be many causes of failure. Only service center is able to precisely determine and repair carburetor malfunctions and fine-tune the carburetor.
By going through the step-by-step defectology of a chainsaw engine you will be able to find the fault, fix it yourself and successfully start your working tool. Don’t take on jobs that you’re not sure about. Have the cause of the problem located and repaired by Customer Services.
- Check and adjust the carburettor
- Measure the compression value of the engine, and then draw the appropriate conclusion about its serviceability
- Check compression in the crankcase
Checking the compression in the cylinder allows you to assess the condition and working order of the cylinder head. To check compression, you need a compressometer. It is screwed into the spark plug hole, and then the starter grip is jerked. Compressometer shows the appropriate value of pressure in the cylinder. This value should be at the level of 8-12 atmospheres.
If the pressure value is significantly lower, it is a direct sign of malfunction. The cylinder piston group in case of failure is replaced by a new one. When installing a new cylinder gear, it is necessary to carefully treat all the parts with oil, so that at the moment of starting the engine no chips and scuffs are formed.
If there is no compression in the crankcase, the chainsaw will not start. The reason for the loss of pressure in the crankcase is the gasket, or rather its damage. This gasket is placed between the cylinder and crankcase and to make sure it is in good condition, you should perform these manipulations:
- Disconnect fuel line from the tank
- Dip the tube into a container with a mixture of gasoline and oil
- Start the chainsaw engine
- If the engine starts and fuel is sucked in, this indicates that the gasket is in good condition
If the fuel won’t come in, then the crankcase gasket needs to be replaced.
The carburetor is the most important and complex element of a chainsaw. If all the above steps did not help to get a positive result, then it indicates that the carburetor is defective. The main carburetor malfunction is clogging its channels and jets. Less often the diaphragms and other elements malfunction. In any case, you will need to disassemble the carburetor of your chainsaw. clean it and replace defective parts.
As you can see, the causes of the fact that the chainsaw does not start, enough. To find out what exactly happened in your case, you need to recall the symptoms of the day before. Perhaps before the chainsaw stopped starting, there were malfunctions in the engine, reduced power and performance, as well as other breakdowns were relevant. On the basis of these technical symptoms and it is necessary to begin the search. If you do not know where to start, then the diagnosis should be carried out in order, as described in the material.
Why the STIHL STIHL-180 does not start when hot? STIHL STIHL 180 chain saw does not start: Recommended Reasons
There are now many manufacturers of machines for agricultural and construction work, among which the most necessary equipment is made by STIHL. The level of features is not the only reason why the products of this manufacturer are popular in the trade. This is also contributed to a democratic cost and better power, which is required to own model of this brand.
I’m sure many have had the opportunity to use a chain saw of a similar brand. Not only to use, but often to do a variety of jobs and make sure of the great performance of this tool. Such a distribution of these products is not accidental, taking into account that in addition to power, this popular tool is distinguished by a graceful design. But do not forget that in reality, that nevertheless it is a technique that has a limited resource of work. Because whoever owns such a machine at some point is faced with the need for repair. In the following we will talk about the particularities of repair of the STIHL 180 chain saw.
Chain lubrication system malfunction in chainsaw
What are the breakdowns in the chain lubrication system:
First, let’s check and clean the tubes that carry oil to the guide bar. Clogging them is quite common.
If there is a significant oil leak (a slight oil leak is normal in all gasoline saws) you should check the tightness of the oil pump tubes and fittings. Tubes can fall off and even crack. Tubing leaks can be repaired by replacing the tubing or sealing material.
As for the oil pump, then different models of chain saws can be different designs, and the drive is also carried out differently (usually by the drive sprocket or a special gear on the crankshaft). If the problem is with the oil pump, then most often it is not necessary to replace the entire unit, it will be enough to replace its moving part (plunger), it most often fails due to ingress of large amounts of dirt and sawdust.
The most serious damage is a crack on the oil pump body. In that case it must be replaced in its entirety.
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Chain brake does not work
The chain brake can also malfunction if the floor space and brake band are contaminated with grease and cuttings. Chain brake may also not work due to worn out brake band. If it gets dirty with sawdust. clean sawdust from the sawdust, and if the sawdust is worn out. replace the sawdust band with a new one.
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Restarting the tool
To get your STIHL chain saw working again, regardless of the brand Ural or STIHL, you need to know where the failure is located.
First you check and change the unsuitable fuel mixture. If you still can’t get it started, you need to go to the next step.
The problem is in the spark plug. pull it out and dry. Never puncture it, as this will cause the part to malfunction. After 30 minutes of drying you may put the spark plug back in, before doing so check that there is no fuel left in its place.
It’s also possible that the spark plug might simply break, so it’s better to have a spare to rule out the cause.
Another reason for the tool not starting and stopping is a bad contact between the spark plugs and the high-voltage wire. If it is all right and you still have no spark, the spark plug may be broken. Such a malfunction can only be repaired by replacing it.
The air filter should be checked and cleaned from time to time. If you have not checked it since you bought it, it might be blocked with dust and cause a malfunction.
Saw models like the STIHL 180, Ural and Partner 350 are often affected by clogged breathers, which can lead to malfunctions. You can clean it with a sewing needle.
The STIHL 180, Druzhba, Ural and Husqvarna 142 models are sometimes clogged, so check and clean them as well.
If the problem is in the carburetor, you should not try to repair it without proper experience. It is best to call in a specialist.
If, after checking and correcting the above problems, your saw still does not start, the cylinder group is most likely at fault.
If you see damage or chips in the piston or cylinder, they must be replaced.
If the chainsaw is malfunctioning because the tubes are leaking, it is likely that the chain is not getting enough lubricant. To fix the problem you just replace the tubes and put sealant on the joints.
These machine parts do not last forever, so they need to be replaced periodically. To find out how long each part serves, you need to look in the manual.
Here is a detailed troubleshooting guide for the most common model
Let’s take a closer look at the STIHL 180’s problems:
- Clogged carburetor or fuel filter. These are the most common problems, and they can be fixed very easily after cleaning. Sometimes the filter has to be changed;
- Plug replacement;
- Sometimes the cylinder or oil seals need to be replaced.
STIHL saws are robust enough to withstand the wear and tear of the saw, and it is often possible to repair them yourself. In fact, the same goes for Partner, Ural, Makita, and Husqvarna models.
If you have a problem with your chainsaw, start small, going over it step by step and fixing the problem. Such problems are easy to fix on your own. But if it is a serious problem and you are not experienced enough, it should be taken care of by a specialist.