Introduction: why Stihl MS 180 refuses to start
chainsaw Stihl MS 180 - one of the most popular models among summer residents and professional loggers due to its reliability and simplicity of design. However, even such a proven tool can fail at the most inopportune moment. If your saw not start on cold, numbing Or it does not show signs of life at all, do not rush to bring it to the service. In 80% of cases, the problem can be solved independently in 10–30 minutes.
The main symptoms of malfunction Stihl 180 They fall into three categories: complete lack of response (no spark, no fuel coming in), The saw starts and immediately dies. (Idle or air supply problems), engine is operating unsteadily (Crossing of the carburetor or filters are clogged).
In this article, we will discuss all possible causes - from the banal lack of fuel to complex breakdowns of the piston groupWe will also provide step-by-step instructions for diagnosis and repair.
Before you start disassembling the saw, make sure you are performing correctly. launcher. For Stihl MS 180 It looks like this:
1. Put the saw on a flat surface. 2. Activate the ignition (switch in position "I"). 3. Pump fuel primer 5-6 times. 4. Extend the air valve lever (the valve is closed). 5. Pull the starter 2-3 times before the first flash. 6. Drown the damper halfway and pull the starter again before full launch.
If after 3-4 attempts the engine did not start, we proceed to the diagnosis.
1. Testing of the fuel system: gasoline, oil, filters
So let's start with the obvious. fuel-mix. Stihl MS 180 fuel-mixed AI-92 and oils for two-stroke engines in proportion 50:1 (20 ml of oil per 1 liter of gasoline). If the mixture is cooked incorrectly (for example, an excess of oil), the saw will either not start, or it will smoke and deafen.
What to check:
- 🔹 Gasoline quality Older gasoline (over 1 month) loses its octane number and can cause detonation. Pour the remains and fill with fresh mixture.
- 🔹 Fuel filter condition - It's in a tank at the end of the hose. If the filter is full of dirt, the fuel does not go to the carburetor. Wash it or replace it (original filter article)
1122 640 7000). - 🔹 Air filter Remove the cover and check the filter for dust and oil deposits. A clogged filter leads to an enriched mixture and difficult start.
- 🔹 Primer (fuel suction) Press it 5-6 times. If the fuel doesn't come in or comes in with difficulty, the problem could be a clogged hose or faulty primer valve.
If after replacing the fuel and cleaning the filters the saw still does not start, we proceed to the check carburettor and ignition.
2. Diagnosis of the ignition system: candle, coil, wire
If the fuel is coming in but the engine is not showing signs of life, the problem may lie in the car. spark-free. To verify:
- Unscrew the spark plug (use the key from the saw kit).
- Check it for any oil, oil, or mechanical damage. The normal color of the electrodes is light brown.
- Insert the candle into the cap of the high-voltage wire and attach its body to the cylinder (to close the mass).
- Pull the starter and watch the spark. If it is not there, the problem is in the candle, wire or ignition coil.
Possible malfunctions:
- ⚡ Clearance between electrodes - must be
0.5-0.65 mm. If the gap is larger, the spark will be weak. - ⚡ Oil on a candle - speaks of an excess of oil in the fuel mixture or wear of piston rings.
- ⚡ High-voltage wire breakdown - Check the insulation for cracks. The wire must be dry and without traces of melting.
- ⚡ Ignition coil malfunction If there is no spark even with a new candle, the coil will have to be replaced.
1130 400 1303).
Advice: Always have a new candle in your pocket. NGK BPMR7A or Bosch WSR6F - They're perfect for Stihl MS 180 They're cheap.
☑️ Checking of the ignition system
3. Carburetor: adjustment and cleaning
carburetor Stihl MS 180 This is the “heart” of the saw, responsible for the preparation of the fuel-air mixture. If it is clogged or not adjusted correctly, the engine will be start upto operate at extremely high speeds or not to develop power.
Signs of problems with the carburetor:
- Saw starts only with the closed air valve.
- The engine sneezes and dies when you press the gas.
At idle turns, the chain continues to rotate (disrupted adjustment) LA).
How to clean a carburetor:
- Remove the top cover and air filter.
- Unscrew the two nuts of the carburetor mount and carefully remove it without damaging the fuel hoses.
- Disassemble the carburetor, wash all the details in the cleaner (for example, WD-40 Specialist) and blow with compressed air.
- Pay special attention to this. jigger (The smallest deposits disrupt the fuel supply) and diaphragm (It should be elastic, without cracks).
Adjustment of the carburetor Stihl MS 180:
There are three screws on the carburetor:
- L - low speed adjustment,
- H - high speed adjustment,
- LA - idling adjustment.
L and H 1 rotation from a fully twisted state, LA - 1⁄2 turn.
After adjustment, check the saw at idle speeds - the chain should not rotate!
How do you know if the carburetor is not repairable?
If after cleaning and adjustment the saw still does not hold idle turns, and chiclers are clogged after 1-2 hours of work, this indicates that the critical wear of the carburetor body. It is cheaper to buy a new carburetor (original carburetor). 1128 400 1301analogue Walbro WT-693>)
4. Piston group: diagnosis without disassembly of the engine
If all previous steps have failed, the problem may be wear of the piston group. Fortunately, Stihl MS 180 It allows for preliminary diagnosis without complete disassembly of the engine.
Signs of piston wear:
- The saw doesn't develop power even at full gas.
The smoke is gray (burning oil).
- Nagar on a black candle with oily deposits.
- Compression below. 8-9 kg/cm2 (Norm for new saws) 10–12 kg/cm2).
How to check the compression:
1. Unwrapped the spark plug.
2. Insert the compressometer into the candle hole.
3. Pull the starter 3-4 times and fix the maximum value.
If the compression is lower 8 kg/cm2The piston group is worn out and needs replacement.
What to do:
- When compressed. 8-9 kg/cm2 try scooping (fill in cylinder means) LAVR ML202 for 2-3 hours, then scroll the engine without a candle.
- With compression below. 8 kg/cm2 - just piston-ring (set for) Stihl MS 180 - article 1122 000 1306).
Before replacing the piston group, check the condition cylinder. If there are deep bullies or ellipsies on its walls 0.05 mmThe cylinder is also subject to replacement (article - 1122 000 1305).
5. Silencer and exhaust system
A sluggish silencer is one of the most common reasons why Stihl MS 180 It starts and dies.. Over time, the silencer accumulates swelling, which blocks the exhaust gases, which causes the engine to "choke".
How to clean a muffler:
1. Remove the muffler by unscrewing two nuts on 8 mm.
2. Disassemble it (if the model is collapsible) or wash it whole in a solution to remove the sodium (for example, Hi-Gear HG3210).
3. Blow in compressed air and dry.
4. Install it back, making sure that the gasket between the muffler and the cylinder is intact.
Attention! Do not use metal brushes to clean the muffler – they can damage the internal corrosion-resistant coating. It is better to use plastic pearls or chemicals.
6. Starter and mechanical failure
If you are trying to launch, you feel that starter scrolls too easily Or, conversely, with great effort, the problem may be in the mechanical part:
- 🔧 Starter cable break Check the integrity of the cable and spring. When the cliff breaks, the starter will scroll without resistance.
- 🔧 Wearing of the crankshaft bearings If you hear metal grinding when scrolling the starter, the bearings require replacement.
- 🔧 Piston jamming If the starter does not turn at all, it is possible that the piston jammed due to overheating or foreign body hit.
- 🔧 Breakdown of the snoring mechanism - if the starter is scrolling in jerks, check the condition of the ratchet on the flywheel.
How to check bearings:
Remove the starter and flywheel, then swing the kneeshaft up and down and left-right. If there is a backlash more 0.1 mmbearings are worn out and require replacement (set of bearings - article) 1110 000 1301).
If the starter scrolls but the engine doesn’t “enough,” the problem is not exactly the mechanics – look for the cause in the fuel system or ignition.
7. Useful Operational Advice Stihl MS 180
To make your chainsaw last a long time and start from the first spurt, follow these recommendations:
- 🛠️ Use only quality oil. for two-stroke engines (e.g. Stihl HP Ultra or Husqvarna HP). Cheap oils form a swell and kill the piston.
- 🛠️ Keep the saw with an empty tank If you leave the fuel for a long time, it will layer, and the resins will clog the carburetor.
- 🛠️ Check the chain oil. - work without lubrication leads to overheating of the tire and wear of the leading star.
- 🛠️ Don't overheat the engine. Let’s drink a rest every 20-30 minutes of work, especially when cutting thick logs.
It's important! After winter or long downtime before the first launch Stihl MS 180 necessarily:
1. Pour the old fuel and fill it with fresh mixture.
2. Check the condition of the fuel hose (it may have cracked from time to time).
3. Grease the starter bearings with litol.
Table: Quick diagnostics of malfunctions
| Symptoms. | Possible cause | Decision |
|---|---|---|
| Saw's not responding to starter | No spark, no fuel. | Check the candle, coil, fuel filter |
| Starts and dies right away. | Carburetor or muffler is clogged | Clean the carburetor, wash the muffler |
| It's not developing. | Reciprocating wear, improper adjustment of the carburetor | Check compression, adjust the carburetor |
| Shooting at the carburetor | Rich mixture, late ignition | Adjust the carburetor, check the gap of the candle |
| The chain is spinning on singles. | Regulations are broken LA |
Reduce idling speeds with a screw LA |
FAQ: Frequent questions about Stihl MS 180
Why is the saw only started with an open flap?
That says something. fuel-poor (Little gasoline, lots of air). Reasons:
- Fuel filter or hose is clogged.
- The primer is faulty (does not pump fuel).
- Carburetor adjustment (screw) is broken L It's too twisted.
Solution: Clean the filter, check the primer and adjust the carburetor.
Can I use AI-95 gasoline instead of AI-92?
No, for Stihl MS 180 recommended AI-92. Gasoline with an octane number of 95 contains more additives that can settle on the piston and candle, causing soak and interruptions in work. If there is no other gasoline, you can dilute the 95th by 30% from the 92nd.
How much does it cost to repair a piston group in the service?
The cost of repair depends on the region and the workshop:
- Replacement of the piston and rings: 2500-4000 rubles. (with parts)
- Replacement of cylinder: 3,500-5,000 rubles.
- Complete engine bulkhead: 5000-7000 rubles.
If you are confident in your abilities, you can save money by buying piston-set And then you set it up yourself.
How to distinguish a fake saw Stihl MS 180?
The main signs of forgery:
Low quality plastic (the case is soft, with burrs).
There is no serial number on the body (the original has it stamped on the top cover).
There is no branded packaging and instructions in Russian.
- Price's lower. 12,000 rubles. (original is from) 14 000 rubles.).
Counterfeitings often break down after 1-2 months of operation, so buy saws only from official dealers.
What to do if the saw starts and dies when heated?
It's a typical symptom. heat-up or air-sucker through the pads. Check it out.
1. The condition of the gaskets of the carburetor and cylinder (replace, the article with wear - 1128 400 1302).
2. Cleanliness of the radiator ribs on the cylinder (if they are clogged with sawdust, the engine overheats).
3. Fuel mix quality (bad gasoline can cause detonation when heated).
If the problem remains, it may be worn out. plumber Replacing it requires disassembling the engine.