How to remove the oil pump actuator of Husqvarna 137
My chainsaw won’t start
Why the chain saw doesn’t start, even if everything is done correctly, in accordance with the instruction manual? The working mixture is prepared in the right ratio, according to the manufacturer’s requirements, and poured into the tank. The air damper is closed to get an enriched working mixture. The fuel is being pumped with the hand pump. The ignition is switched on with the corresponding button. Several quick jerks on the starter grip have been made.
I would like to draw the attention of beginners to the process of chain saw starting. If everything is done correctly, then when you start the engine at the moment of fuel entry into the cylinder on the starter handle will be felt an additional resistance
It occurs because in the upward movement before ignition of the spark plug the piston prior to compression of the working mixture, and the resistance sharply increases. You can already tell by this indication that:
- Fuel flows into the cylinder.
- the piston group is still alive and has some compression, the exact value of which we can judge only by measuring with a compressometer.
Based on these conclusions, we can assume that if there is fuel in the cylinder and the engine does not start, the cause is probably the spark plug.
Causes of chain saw oil failure
the chainsaw has stopped feeding the tire from the tank Support our channel in any way you can.
The engine is turned on at a medium speed and warmed up for about 10 minutes. The screw responsible for adjusting the idle speed, should move clockwise. It is released only when the engine reaches a stable operating mode. Check that the chain does not move during this process.
When idling, the engine can stop (see the reason here). In this case you have to immediately turn the adjusting screw clockwise as far as it will go. Sometimes the chain starts to move. In this case you need to turn the adjusting screw in the opposite direction.
Husqvarna-137 chain saw: Husqvarna-137 starter repair manuals with your own hands, valve failure, no spark
Husqvarna 137 small chainsaw belongs to the category of amateur equipment. The product is light, comfortable and compact. It is not only popular in households, but also with professional loggers. Builders, rescuers and foresters are in demand for the unit, as it is convenient for them to work in hard-to-reach places and in cramped conditions.
Let’s take a look at typical crankshaft failures:
- Leaking crankshaft oil seals;
- “Oil starvation” of the working surfaces;
- mechanical damage to crankshafts;
- natural physical wear and tear;
- Abnormal increased physical wear and tear.
For crankshafts, as well as for other engine parts, the most dangerous is “oil starvation”. the cause may be a broken oil pump, clogged oil channel, low oil level in the engine. This leads to increased bearing friction, heating of the components. Continued operation of the engine in this mode will cause engine overheating. Complete jamming and to overhaul. “Wedging” on the run can cause critical damage to the shaft or other engine components.
Water and fuel in the oil change its chemical. composition and viscosity. The cause may be significant wear of the cylinder piston group, disturbed gasket structure, microcracks in the engine block or cylinder head.
Husqvarna 137 Oil Pump.
With time journals and bearings are subject to wear, the allowable clearance increases, crankshaft backlash appears, it leads to an increase of vibrations, the engine starts to “knock. A characteristic engine knocking is a critical signal. If it occurs, stop moving and urgently apply to the car service. If the crankshaft is out of balance or not mounted correctly, increased abnormal wear on the contact surfaces may occur.
Causes of reduced performance and system efficiency
In the right amount of oil is not supplied to the chainsaw chain for several reasons. Among the most characteristic failures are:
- clogging of the filter located in the oil tank;
- mechanical failure of one of the worm drive elements of the pump;
- In the winter the output of the oil pressure system is reduced because the system is filled with too thick an oil.
In the latter case, the drives and all pump parts operate under increased loads that initiate serious mechanical damage.
Design and principle of the chainsaw clutch
Modern chainsaws are equipped with a centrifugal clutch. This means that their operation depends entirely on the torque of the motor, which at a particular moment in time produces the saw.
Its main structural elements are:
The principle of operation is as follows. When starting the saw, components that move freely in a radial direction are compressed against the axis of the shaft by springs. In this case the torque is not applied to the drum and hence to the sprocket and guide. The moment the centrifugal force prevails over the force potential of the springs, the clutch elements loosen and compress at the inside of the drum, initiating its torsion. Together with it, the rotational cycle goes to the sprocket and the bus-chain headset itself.
The main advantage of this type of clutch is considered to be its slippage during sudden braking of the cutting part, which does not stop the engine. As a result the “heart” of the saw. the motors remain in one piece.
How and when to adjust the ignition on Husqvarna saws
Users of Husqvarna chain saws often have the question: how and when to adjust the ignition. The answer is simple. Husqvarna chain saws have an electronic ignition coil and flywheel, which do not have the ability to adjust the ignition. The only thing that can be adjusted is the clearance between the coil and flywheel.
To adjust the gap at home, you need to cut the dipstick from a plastic bottle, and then loosen the screws fixing the coil. Next, the dipstick is installed between the contacts of the coil and the flywheel. The screws are tightened.
It is necessary to adjust the gap during maintenance or if you find scoring on the surface of the handwheel. Such scuffing indicates that the clearance is completely missing.
If after the clearance between the coil and flywheel is exposed, and the parts continue to come into contact, the crankshaft bearings should be checked for wear. It could be that the spark plugs are badly worn and need to be replaced.
Just like any mechanism, though, the Husqvarna 137 can become “capricious”. Here’s a look at the most common problems with this model of saw:
Since malfunctions of this system are the most common, the first thing to inspect is the spark plug. If it is completely dry, then it must be put back in place, and look elsewhere for the cause of the failure.
If there are traces of fuel on the spark plug, then the fault is really somewhere nearby.
Wipe the spark plug, cut off the fuel supply and turn on the starter. This will get rid of excess fuel in the combustion chamber. Then put the spark plug back in place, check the carburettor adjustment according to the manual and start the engine strictly according to the same manual.
Another problem is the soot on the spark plug. In addition to cleaning it, you need to reconsider your approach to the oil you use. Carbon deposits appear because of poor-quality oil that not only makes it hard for the ignition system to work but also makes other parts of the saw more subject to wear.
If cleaning the spark plug and blowing out the combustion chamber does not help, check the clearance between the electrodes and the spark plug. You can correct it with a new gasket.
In cases where there is absolutely no spark, even when replacing the spark plug, it is advisable to go to a specialized workshop, as the problem may be caused by a faulty high-voltage cable.
First, check the carburetor adjustment.
If fuel is still not flowing into the cylinder, remove the fuel hose, and check the fuel supply. Weak jetting indicates a problem in the fuel filter. It should be rinsed in water, dried and then put back in.
Similarly, the air filter should be checked. Insufficient air flow to the carburetor can cause the engine to stall.
After flushing the filters, inspect the system for foreign particles that could obstruct the flow of fuel.
If all else fails, it may be the carburetor itself that is the cause of the problem.
When the saw cuts out when the rpm increases, it is advisable to check the muffler. The spark arrester is located there and often becomes clogged with various combustion products. To fix the malfunction, the muffler should be well cleaned.
The rest of the chainsaw failures, as a rule, are more serious and require qualified repair.