Stihl MS 180. a reliable and unpretentious tool, but sometimes requiring repair, like any equipment. In this article, we will consider how the Stihl ms 180 chainsaw is disassembled, which is necessary in the event of an overhaul of the engine.
Repair of any equipment should begin with the preparatory phase, and the Stihl 180 saw is no exception. At the preparatory stage, before dismantling the Stihl 180 chainsaw, it is necessary to remove the side cover, chain and tire from the chainsaw. Next, with the help of a compressor and a brush, you need to clean the chainsaw from dirt, sawdust, oil drips and other things.
Particular attention when cleaning the saw should be given to the place where the chain sprocket of the chainsaw is located, because this is the most polluted area.
In places of large accumulation of oil, you can rinse with clean gasoline.
Direct disassembly of the Stihl 180, begins with the removal of the handle, which is attached to the body of the chainsaw using three rubber shock absorbers. To remove, it is necessary to remove the plastic plugs from the inner cavity of the shock absorbers, and then using a powerful screwdriver, squeeze out the upper shock absorber first, then the one that is closer to the rear handle.
A gas trigger is installed in the rear of the handle, which is connected to the carburetor through a wire rod, in order to disconnect the rod from the gas trigger, two screws must be loosened and the handle disassembled.
When the handle remains on one shock absorber, it is necessary to unscrew the chainsaw body from the inside of the handle and breaking it to the side, remove the body from the last rubber band.
At the next stage, the upper housing cover is removed and 4 starter mounting screws are untwisted, after which it is necessary to remove the oil tank and fuel barrel covers. The starter is removed quite simply and no problems should arise.
After removing the starter, the opened internal cavity of the chainsaw needs to be cleaned, because usually on the body under the starter there is a large number of compacted small sawdust.
The Stihl 180 chainsaw flywheel is twisted with great effort, so to remove it you will need a head with a metal knob. The nut holding the flywheel is unscrewed by 13.
To block the crankshaft from turning, you need to unscrew the candle and install the piston stopper through the spark plug hole, if it is not there, you can use the old string from the starter, with knots attached to it and immersed in the cylinder through the spark plug hole.
It is strictly forbidden to keep the flywheel from turning by installing a power screwdriver and other tools between its ribs and the body, with this method of locking from turning, the flywheel blades are not able to withstand loads and break off.
After the piston in the cylinder is blocked, you can unscrew the flywheel nut. The thread in the nut is normal, so you need to twist to the left side. After loosening the nut, it is not necessary to completely remove it, it is enough to unscrew it until its upper edge is equal to the tip of the shaft, after which a soft metal drift is installed on the nut and a sharp blow is made to it. Thus, the flywheel jumps off the shaft from a sharp impact and can be easily removed without the need for additional tools.
Video: How to Disassemble a Stihl 180 Engine
Dismantling the clutch and drive the oil pump
Before disassembling the clutch, it is necessary to dismantle the drive sprocket. To do this, carefully remove the lock washer from the grooves on the shaft and remove the sprocket and needle bearing.
High head 19, unscrew the clutch. The thread on it is left, so it is unscrewed towards the tire, and not the rear of the Stihl 180 saw.
Having unwound and removing the clutch, you need to immediately remove the reflecting plate and the pump oil drive, this is easy to do, because they are put on the shaft without any attachment.
Carburetor, silencer and ignition coil
To remove the carburetor, it is necessary to have a head for 8 and an extension cord, with which it is convenient to unscrew the nuts of the carburetor and air filter. Before dismantling the carburetor, it is necessary to disconnect the ignition wire and the choke rod from the engine control lever and remove the lever, only then the air filter and carburetor are removed.
The Stihl 180 muffler is fastened with two nuts, having unscrewed which you need to pull it towards you, it can easily be removed.
The coil is mounted on two screws, for removal you just need to unscrew them.
Removing and disassembling the engine
The engine is held by 4 screws installed on the bottom of the Stihl 180 chainsaw. To remove, you need to untwist them, then carefully remove the engine from the seat and the rubber pipe of the carburetor.
To disassemble the engine, 4 crankcase screws are untwisted, and it is removed, then you can remove the crankshaft assembly with oil seals, bearings and piston rings.
Removing bearings and oil seals usually does not require additional tools, but if the bearings were pressed onto the shaft with force, then a special puller will be needed for dismantling.
To remove the piston from the connecting rod, you will need to remove the retaining ring from the seat, using a thin screwdriver, then the piston pin is extruded from the opposite side, after which the piston is removed to the side.
Stihl 180 chainsaw assembly
To assemble the stihl ms 180 saw back is quite simple, the main thing is to adhere to the following algorithm:
- Install the piston on the connecting rod, the arrow on the piston should look along the Stihl 180 chainsaw, and the side of the crankshaft, which is used to install the flywheel, should be located on the left hand of the piston;
- Carefully insert the piston back into the cylinder, the place for mounting the coil should be on the side where the flywheel is mounted on the crankshaft;
- Install bearings, seals, circlip on the shaft and lower everything in the assembly into the seat in the cylinder;
- Then degrease the crankcase installation location and the crankcase itself, then grease with sealant and tighten the 4 fixing screws in place;
To assemble a Stihl 180 saw after the moment the engine is assembled, the reverse disassembly sequence must be observed. It is important to take the process carefully and remember to install traction on the carburetor, and connect the ignition wire.
Below you can see the Stihl 180 disassembly in the video, it is made for inexperienced users, it shows in detail the whole process.
Dismantling the Stihl 180 chainsaw and assembling it, with some experience, is quite simple, the main thing is to thoroughly clean the saw before work and not rush. In order for small parts not to get lost, you need to use containers in which, in the process, it is worthwhile to lay out spare parts.