A lawn mower engine will puff out black smoke when the fuel and air mixture is too rich. Because there isn’t enough air, combustion is incomplete, and the unburnt fuel in the combustion chamber turns to smoke. You see the same phenomenon when you burn leaves and pack them too tightly to allow air to circulate.
Why is my lawn mower blowing a lot of white smoke?
White smoke indicates that the engine is burning oil. This is usually due to a spill or accidental overfilling of the crankcase. As soon as the trace oil that has reached the engine is burned off, the smoke should clear up and your mower will operate fine.
How do I stop my lawnmower from smoking?
Try replacing the air filter. (Note: air filters vary by mower model; view example air filter on Amazon.) Next, run your lawn mower for a few minutes. If the black smoke still appears, the carburetor might need to be adjusted in order to increase airflow.
Why is my lawn mower blowing GREY smoke?
Often times this color of smoke is caused by a blown head gasket, a worn cylinder or worn rings, or an inoperative crankcase breather, all of which will need help from a professional. So remember, just because your mower is smoking doesn’t mean it’s broken – it just may need a little bit of care.
What are the symptoms of a blown head gasket in a lawn mower?
Signs & Symptoms of a Blown Lawn Mower Head Gasket
- Leaking Oil. Examine the mower for any signs of oil leaking from the gasket. …
- Low Pressure. If the mower is dropping out or not starting and you do notice the oil leak, you have a bad gasket. …
- Smoke From the Exhaust.
Can you put too much oil in a lawn mower?
Too much oil in your lawn mower may cause the engine to not run well and cause damaging results. Too much oil can cause your engine to overheat which can result in seal damage, blown gaskets or becoming hydrolocked.
Can lawn mower explode?
A lawn mower is likely to explode if it catches fire, or if there are unauthorized changes made to the fuel supply and the engine. When used normally, the chances of a lawn mower exploding are virtually negligible.
How do I stop my lawn mower from burning oil?
Here are some measures you can take to ensure your engine’s regular maintenance:
- Avoid storing your lawnmower for long periods with gas and oil inside. …
- Regularly check and replace any worn-out parts to prevent oil leakages.
- Replace old oil with new oil after every 25 hours of use.
Why does my lawn mower burn oil?
Oil Leaks. If an oil leak develops somewhere in the lubricating system or in the engine, while it may not be visible, this will cause your lawnmower to burn through oil more quickly. Common oil leaks occur around the breather cavity, the oil gaskets and the O-ring on the oil tube.
Why is my mower blowing black smoke?
Black smoke emitted from a lawn mower engine is typically an indication that the gasoline to air ratio is too rich. … Black smoke is also an indicator that oil has found its way into the cylinder, and the mower is trying to burn it along with the fuel. In some cases, the mower will not restart.
What causes white smoke from exhaust?
White smoke from the exhaust: This could be steam caused by condensation in the exhaust pipe or a more serious issue caused by an engine coolant leak. Excessive amounts of white smoke could indicate head gasket failure.