And is it a fire hazard? A homeowner can usually identify the reason for a smoking lawn mower by gauging the color of the cloud coming around the engine, then fix it accordingly before lasting damage occurs. Keep in mind that all mowers with internal combustion engines contain the same basic parts, but the configuration of those parts varies widely, depending on manufacturer and model.
Solve the problem by restarting the mower and allowing the spilled oil to burn off. To do this, remove the dipstick cap, wipe off the stick with a rag, and reinsert it into the reservoir.
Also note that using the wrong grade of engine oil may cause blue or white smoke. Try replacing the air filter. Note: air filters vary by mower model; view example air filter on Amazon. You will find the damaged gasket on the engine block where the cylinder head connects to it.
Take the gasket off and use a tool to scrape off any hard to remove pieces of gasket but be careful not to damage the smooth surface when scraping off the debris. Place the new gasket on the engine block and place the cylinder head back in place before bolting it back onto the cylinder head and putting the sparkplug wire on the sparkplug. You can purchase head gaskets here. Of all the causes of white smoke in lawnmowers a failed piston ring is probably the worst one and it is normally seen in older worn out lawnmowers or if the mower is poorly maintained.
Piston rings control the amount of engine oil and supply very little amount of oil to the piston in order to move smoothly inside the cylinder. But when these piston rings fail there is nothing to stop the engine oil from entering the combustion chamber and burning up to produce white smoke.
Piston rings may get damaged due to any number of reasons but the most common ones include:. If your mower is burning up a lot of oil and producing white smoke as it runs with very little to no power than it can mean that your mower has bad piston rings.
Unfortunately repairing failed piston rings is not a simple repair and it will require a complete engine rebuild and the whole engine will need to be opened up. If your lawnmower has bad piston rings then chances are the head cylinder will also have signs of damage and will need to be replaced as well. Here you can find lawn mower piston rings. If you own a 4 stroke lawnmower then mixing oil in the fuel of your mower is a big no. A lot of modern-day lawnmowers come with 4 stroke engines because they are more reliable and last a lot longer compared to 2 stroke engines.
If the fuel you put inside your lawnmower had oil in it then as the lawnmower starts running it will burn the oil that has been mixed in the fuel and produce a lot of smoke. And if you keep running the engine with engine oil in the fuel tank it can lead to damage and premature wearing of the engine.
Depending upon how much oil got into the fuel tank you might be able to get rid of oil in the fuel tank by simply running the mower till it burns off the contaminated gas and then fill fresh clean gas in it. But if you are not certain about how much oil got mixed with the fuel and you want to be on the safer side then you will have to remove the fuel from the fuel tank and carburetor before filling it with new fuel.
You can remove oil mixed fuel from your lawnmower by following these simple steps:. Remove the fuel line from where it exits the fuel tank by undoing the clip that holds the fuel line in place and pulling the fuel line off. Or you can follow the fuel line where to the shut-off valve and remove the fuel line where it connects with the shut-off valve.
A shut off valve is a small knob that allows you to stop the flow of fuel to the engine and it is pretty simple to locate. After the fuel line is removed the fuel will start pouring out of the fuel tank and you can collect it in a pan to avoid spilling it since spilled gasoline can be a fire hazard so you would want to prevent any spillage on or around the lawnmower. Somehow, the oil has a pathway to the combustion chamber.
You could have a rupture in the breathing tube, a blown head gasket or a worn seal. Finally, if you see blue smoke, you know you have an issue and there is oil seeping into your combustion chamber, which is also one of the reasons that white smoke could be there and not going away.
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