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[Pic Video Repair Guide] Push Mower Blowing White Smoke

Unless you’re trying to bring back the lost art of smoke signals, then I’m assuming you’re here to get your push mower fixed. Let’s skip the usual formalities of an intro paragraph and get right into why your lawn mower is keeping all of the mosquitoes away with plumes of white smoke from the exhaust!

As a general rule, a push mower will blow white smoke if it was tipped incorrectly and the air filter becomes saturated with engine oil from the crankcase, or if too much oil was added during the last oil change. Both result in oil being added to the combustion process and the result is white smoke.

That’s the quick and easy answer if you needed to make a quick gambling bet.

Below I’ve got a quick table that will take you through the primary reasons you’ll see white smoke from your lawn mower’s exhaust, followed by a detailed explanation and pictures of each, as well as a video tutorial.

Overfilled OilReplace Air Filter

Push Mower White Smoke Caused by an Oil-Soaked Air Filter and Overfilled Crankcase

I haven’t kept track of how many lawn mowers I’ve fixed with this problem, but it’s certainly been a common one and is probably responsible for 50% of all of the fixes that I’ve done over the last 7 years.

When a neighbor brings a mower to me with this problem, or if I snag a free mower on Marketplace with this problem, the first thing I do is pop off the cover to the air filter.

An air filter works best, ideally, when it’s clean, but it can certainly still work alright even if it’s dirty — as long as it is dry! Air filter on the right was choking this mower and had to be replaced. White smoke was coming from the exhaust until I replaced it with the one on the left.

A wet air filter is NEVER going to work for anything other than allowing your mower to keep away all of the mosquitoes from a giant plume of white smoke.

If you pop off your air filter cover and notice that it is wet, or was wet at one time and is now really caked with dirt because of it, then you’re probably wondering what happened.

• Mower was tipped incorrectly and oil flooded the combustion chamber and air filter through the breathing tube
• Mower was overfilled with oil and excess pressure in the crank case is causing oil to run up the breather tube to the air filter
• Float needle is compromised in the carburetor and the gas is leaking out onto your air filter (inline models only) and after running for a while it will draw oil up for the reason mentioned in the bullet point above

If you got something stuck in your blades, or if you wanted to clear out matted grass from underneath the deck, it’s likely that you tipped over your lawn mower on one side or the other.

There’s a correct way to tip your mower over, and then there’s every other way that will cause smokey engine issues.

If you want a quick tutorial, I highly recommend checking out my other article here which will guide you through the process of turning any lawn mower (rider or push) on its side so that you don’t mess anything up.

In a nutshell though, you want to disconnect the spark plug for safety, and either tip the mower back on its handle (not usually ideal) or tip it so that the air filter and carburetor are facing up towards the sky. Before you tip it though, you want to get the piston at the top position during the compression stroke.

Again, the article above will guide you through this process. This is the correct way to tip a mower but which side you tip it on can vary from make and model. If you are unsure about yours, click on the link before this image.

If you tip it with the carburetor and the air filter down, then bad things happen. The oil in the crankcase can flow directly to the air filter via a small black tube called a “breather tube”. This tube serves to allow pressures to equalize in the crankcase (where the oil is) when the mower is upright and operating.

When you tip the mower over incorrectly, oil simply flows out of the mower and into the air filter.

Once your air filter becomes wet with oil, it changes the entire dynamic of the combustion process in your engine.

A lawnmower engine is a pump that tries to suck air and fuel in at 3,100 RPMs. Air can easily pass through a dry filter, but once it’s wet with oil the air can no longer get through or is severely restricted.

If the engine doesn’t stall, then it’s going to work its hardest to pull air from somewhere. While doing this, the negative pressure in the combustion chamber must be filled somehow if it is to stay running. It will try to suck more air out of the carburetor which will actually just cause it to suck more gas as well and run rich.

It will also try to suck air in from the crankcase by the piston rings which will inevitably allow oil to flow up and onto the piston.

Both excess gasoline and oil itself will smoke during the combustion process, which oil being more of a white color and gasoline being black.

The same concept applied to if you’ve overfilled the crankcase with oil during the last oil change. Make sure it’s in the acceptable range on your dipstick.

If it’s too high, the mower will have excess pressure in the crankcase because it won’t have enough air to work with and is instead full of a liquid oil. As the piston goes up and down at 3,100 times per minute, the buildup of the air pressure will displace the oil by forcing it up the breather tube and into your air filter, and by forcing it by the piston rings themselves.

An easy way to tell if you have to much oil without even checking the dipstick is to see if there is oil spray from the exhaust on top of your mower deck.

Tipping your mower wrong or overfilling with oil are the two most common reasons for getting a wet air filter. If your filter is still wet but you didn’t tip it, and your oil level is fine, then check to see if your air filter is inline with your carburetor.

By this, I mean that if something were to flow out of the carburetor that it would run into your air filter. An air filter located above the carburetor doesn’t count.

If your air filter is inline, then it is possible that your float needle in your carburetor is malfunctioning and causing gasoline to flood the carburetor. When it flows up and out of the bowl, it will either run into your engine or onto your air filter, depending on the angle and gravity.

In this case, you’ll need to pinch off the fuel line, remove your air filter assembly and carburetor. Remove the bowl of the carburetor and clean out the float needle seat area and replace any rubber components that are deformed or cracked.

Push Mower White Smoke Caused by Overfilling the Crankcase with Oil

I touched on this one a little bit above, but it is probably responsible for the other 50% of cases that I’ve dealt with that cause white smoke from a push mower’s exhaust.

Essentially if you overfill your engines crankcase with oil, then you disrupt the pressures that the engineers put in place within the engine itself during the combustion process. The two holes in the dipstick indicate the acceptable range. If your oil is much higher than the top hole then you’ll need to drain some oil out to prevent white smoke.

Remember that air can be compressed, but liquids will not.

If you give the crankcase less air to work with since you dumped too much oil into it, then every time the piston drops down during the combustion process, it will increase the pressures within the crankcase.

The tolerances are now off and the increased pressure has to do something.

It will do either of the two things or both:

• Displace oil and drive it up through the breather tube and into your air filter (clogging it and increasing pressures even more)
• Displace oil and drive it passed the piston rings and into the combustion process (which will always lead to white smoke with oil)

The fix for this is simple. Just drain the excess oil until your dipstick is reading within the correct range.

Fire up the engine and try it again (after changing your wet air filter, of course).

It should be dramatically better but don’t be surprised if it still smokes for up to 15 minutes.

If you overfilled the engine oil, then there is likely liquid oil that is in the exhaust itself and needs to be burnt out by heat while the engine is running.

Push Mower White Smoke Caused by a Compromised Head Gasket

This one is going to be rare and will be more involved. I have not had it happen to any lawn mowers that I’ve repaired but I did have it happen with a generator.

The head gasket could be cracked either internally (between the combustion chamber and the push rods) or externally (between the push rods and the outside air, or between the combustion chamber and the outside air).

Any of these issues will result in weird air pressure changes within the crankcase and combustion chamber and can do all sorts of strange stuff with what you see coming out of the exhaust.

This is unlikely to be your problem, but I thought I’d mention it if draining your excess oil and replacing your air filter don’t work.

This is a job that can be done by yourself, but I would rate it as moderate as far as mechanical abilities. If it’s your first time, it would definitely feel like a hard job to do.

Other Possible Reasons for White Smoke from a Push Mower

I thought I’d throw in a few honorable mentions into the mix. We covered the two main ones, but these could haunt you — especially if you got your lawn mower used and don’t know the history behind it.

Make sure your oil is the correct type for your mower. Consult your manual if you’d like, but in North America during the summer you can use SAE-30, 5W-30, or 10W-30 without a problem.

If your oil is incorrect (especially too thin) it could lead to oil seeping by the piston rings and burning up during combustion.

If you have gas that got mixed into your oil by tipping the mower the wrong way, then you could also have thinner oil and this could lead to white smoke as it gets by the piston rings.

If anyone has used 2-cycle engine oil, this could do some pretty strange stuff as well.

It’s more common with snowblowers with ice forming inside, but if your breather tube that runs from your crankcase to your air filter is clogged by something, then it would change pressures and allow for oil to work passed the piston rings.

Robert lives in central Michigan and enjoys running, woodworking, and fixing up small engines.

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Why Does My John Deere Smoke? [Causes Solutions]

You’re bound to get some anxiety when you notice smoke spewing from the exhaust or elsewhere on your expensive John Deere Mower. How bad is it? How much is it going to cost to get it fixed? Is the damage permanent? These are all reasonable questions, but there’s no reason to panic.

There are several potential causes behind smoke pouring out of your John Deere. Low coolant levels, low engine oil levels, too much oil, bad injectors, plugged air filters, and leaking head gaskets are some of the most common reasons for a smoking John Deere.

Fortunately, all of the above is repairable, and although a leaky head gasket sounds complicated, it’s not as bad as you think, and it’s also one of the rare causes on the list.

There are also cases where there may be white smoke, and nothing is wrong with your mower.

Potential Causes and Solutions

Nobody wants to see smoke spewing out of their lawnmower, especially if it’s a new John Deere, but it happens. So, the next step is ascertaining the problem. Where it’s coming from and how to fix it, hopefully on your own.

DIY repairs are the best way to go if you have the tools and capacity, especially when it comes to a John Deere because they don’t just hand out repairs for free.

However, if you have it under warranty, that’s a different story. Warranty or not, what could be the source of the smoke?

Low Coolant Level

Low coolant levels are easy to ascertain as you can simply check your coolant level and ensure that it is where it’s supposed to be. Of course, you want to let your mower cool down before you pop the cap.

When the coolant gets too low, overheating occurs throughout the engine, and while it won’t smoke like crazy, you will see some white smoke coming from the engine. If you own a relatively new John Deere, there’s a chance that you have low coolant because there is a slow leak somewhere.

You should top your coolant off, but you should check all of the connections in and around your radiator and observe it carefully while it is running.

Air Filter

There are three things required for combustion: air, fuel, and spark. If your engine isn’t getting enough air, then it is probably running “rich,” a term for too much fuel and not enough air for proper combustion. This will cause black smoke rather than white, and one of the first suspects is the air filter.

You should remove it and clean it thoroughly (use compresses air to blow it down if you can), but you should also include your air filter in your routine maintenance procedures.

Oil Level is Too High or Too Low

Lack of lubrication will certainly produce smoke, as you will have an increase in friction and heat from moving parts within the engine that are not properly lubricated.

The problem with low oil levels is that by the time you notice it (thanks to all of the smoke), there will likely be side effects throughout the engine.

Also, like the coolant levels, if your John Deere is relatively new or well taken care of, a low oil level is likely a sign of a leak somewhere.

Too much engine oil is nearly as problematic as the reverse. Excess oil burns off and increases pressure in the crankcase. The burning off creates smoke and, as a side effect, will damage or clog your air filter as well.

You’ll need to drain the oil and change or clean the air filter. Whenever you put oil in the mower, always use only the recommended oil type and the exact amount specified in the user manual.

Bad Injectors

If your injectors aren’t working correctly, you will not get the right amount of fuel. This usually leads to fuel that isn’t burned away and leftover fuel that isn’t ignited. The typical result is white smoke. However, the John Deere will also show signs of sluggishness, vibration, or otherwise just not running right.

Depending on what John Deere you have, the process for changing the fuel injectors can be drastically different. Fortunately, there are a lot of YouTube videos on the process. Also, if your John Deere is under warranty, you will want to take it in rather than risk voiding the warranty trying to repair it yourself.

There are also several fuel injector cleaners you can try first, as that might be enough to resolve the problem without having to get it repaired.

Leaky Head Gasket

If your John Deere is pretty new, a leaky head gasket is undoubtedly something that will be covered under warranty, so long as you haven’t done anything that would directly cause damage to a head gasket.

This is probably one of the more difficult things when it comes to a DIY fix, so if you are not a John Deere Tractor or Mower mechanic, it might save you a lot of headaches to just take it in for a repair.

It may be on the expensive side, but it’s not as bad as purchasing a new John Deere.

White Smoke, Black Smoke, and Blue Smoke

White, black, or blue smoke might not tell you exactly what the problem is, but they will point you in the right direction if you know what they mean.

Black Smoke

Black smoke is usually caused by burning too much fuel without enough air. Most of the time, that indicates bad injectors or, more commonly, a clogged-up air filter. If your air filter is relatively clean, there is an air restriction somewhere, which might be a problem with the choke.

Blue Smoke

Blue smoke is usually the direct result of burning oil. It’sIt’s just the color that tends to come from it when it is burning rather than lubricating the moving parts throughout your engine. Sometimes, the blue can be really dark, and that might mean that you have multiple issues going on.

If you see blue smoke, check your oil levels to ensure that the reservoir wasn’t overfilled during your last oil change or that there is plenty of oil there.

It’s mostly going to be a problem from excess oil. However, leaking oil can find its way into places hot enough to burn it off, and you’ll notice a low oil level.

White Smoke

You get white smoke from leaky head gaskets and gas in the oil or vice versa. Diesel engines are more prone to white smoke, but that doesn’t mean you will never see it in gasoline engines.

Diesel fuel filters that aren’t working properly can cause white smoke, and out of three colors of smoke, this one will be the most prevalent, especially in diesel engines.

Conclusion

Signs of smoke emanating from your John Deere aren’t the end of the world. However, there is always cause for concern.

The best thing to do is address the smoke immediately and locate the cause, even if you discover that the cause is nothing damaging.

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• Why Does My John Deere Gator Grind When I Put It In Gear?
• Can I Use Synthetic Oil In My John Deere Riding Lawn Mower?

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Why Is My Lawn Mower Blowing White Smoke?

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Getting a big Cloud of white smoke can be scary. Most people don’t expect it to happen — but why is it even happening?

Why is your lawn mower blowing white smoke? The truth is, it could be one of these reasons:

• An air leak in your crankcase
• An overfilled crankcase
• A broken or not working breather in your crankcase
• Poor grades of oil
• If you tilted the engine for more than 15 degrees (even if just for storage)
• If your cylinder is worn out
• Head gasket broke

Of course, just knowing what caused your lawnmower to blow white smoke is not enough — you also have to know how to fix it. So, if you want to learn more about these issues (as well as

some other problems that may be the cause of white smoke), as well as the solutions, read on.

Common Reasons a Lawn Mower Is Blowing White Smoke

As mentioned, there are some common reasons why your lawn mower may be blowing white smoke. It happens often — much more often than you’d think — and most of these problems are easy to troubleshoot, but more on that later.

For now, let’s just take a look at all of the possible reasons why your lawn mower may be blowing white smoke. Some of them you’ve already seen at the beginning of this article. Here they are:

• Tilted engine, as the most common reason for white smoke blowing out of your lawnmower (no lawnmower should be tilted at an angle bigger than 15 degrees).
• Oil issues such as overflowing oil or wrong type of the oil are the second most common cause, and it’s often very easy to fix.
• Leaks are another common issue, and they could cause even more problems if you leave them be.
• Broken parts such as the head gasket, cylinders, etc. need to be checked for once in a while to prevent these issues.

Other than these causes, there are some less common ones, but it’s good to be aware of them, just in case you are one of the people it happens to. Here they are:

• Blocking of the breather
• Putting more oil than the dipstick shows
• Damaged piston rings

Fortunately, all of these are easy enough to repair. There’s no room for panic. First, you need to shut your machine off and let it cool down. Then, you can move on to some solutions.

How to Fix the Most Common Causes of White Smoke in Lawn Mowers

While white smoke looks scary and like a serious issue, it’s actually not. You can fix it in no time if you just follow some simple steps. Naturally, you may not know immediately what caused the smoke, but it doesn’t hurt to test some of these solutions out until you get it right.

Copyright protected content owner: ReadyToDIY.com and was initially posted on 2020-05-25.

Cause #1: Lawn Mower Tipped Over

Starting with the most basic cause of white smoke in lawn mowers, this one is also the easiest to fix. You’ll also know if this is the cause right away. Has your lawn mower been tipped at an angle greater than 15 degrees? Maybe you stored it that way, or you accidentally moved it like that.

Most people end up with this issue because of cleaning under the deck or even because they are emptying the chute. When they do this, the oil moves from the crankcase to the cylinder, and once you start mowing again, your lawnmower starts to smoke.

In some cases, the oil will leak too.

The best solution for this is to put the lawnmower upright, check the oil in the crankcase (add more if necessary), and then let the engine run until the smoke dissipates. It’s a simple solution, although it may not be comfortable for your neighbors because of all the smoke.

But if you have a tractor mower, this will usually not be the case, so you have to look for other causes.

Cause #2: Oil Issues

In general, your lawnmower will take a little over a pound (near 0.5 l) of oil. This is a really small amount, so it would be no wonder if you overfilled the crankcase once in a while. It’s common. To prevent it, just check the level and the amount carefully before moving on to mowing.

Often, people think that a little oil can’t hurt anyone, especially not the lawnmower, but the fact is that it could be very bad for their engine. Most engines work on a system of splash lubrication, and if the oil level is higher than the paddles, it won’t work well.

In this case, the engine is blowing white smoke because it’s trying to burn all of that oil. You can fix it quickly by draining the oil and then let the engine run until the smoke is no longer present. It’s a quick and simple solution, just like with the first cause of white smoke.

While extracting the excess oil could be bothersome, especially on some models, you should do your best because it will make the process quicker.

If the oil smells like gas, you shouldn’t run the engine, though. This will mean that your carburetor seal is broken. In this case, you want to make the fix to the carburetor and then change the oil before using the machine again.

If you try to run the engine without adding proper oil and fixing the problem, you could damage the engine because the oil will be too thin (because of the gas).

Another thing that could happen is that the oil has found the way to the carburetor, and then the gas can’t get to the jet. If you run the engine a few times, you will be able to spend that oil, and the smoke will go away. If it seems like it won’t work, you should clean your carburetor.

For one, you’ll have to turn your engine over and then spill the oil from it. Then, you can replace the plug and try again. There are more detailed cleaning measures for the carburetor, but try them after you try this first as it’s simple, and it might just solve your issue.

You could also put oil in the gas tank by accident, which is a common mistake. To fix it, just drain the oil and put in the gas. Run the engine for a while afterward, so the remaining oil clears out, and the smoke goes away. Again, you could clean the entire carburetor.

Cause #3: Head Gasket Issues

If your head gasket breaks, you’ll probably see a lot of smoke. It’s less common too, but it’s still possible — harder to fix, too.

Copyright article owner is ReadyToDIY.com for this article. This post was first published on 2020-05-25.

A head gasket is a part lodged in between the cylinder head in an engine and the cylinder block, and it serves the purpose of sealing the area where the combustion happens. Some common symptoms — other than white smoke — of this problem are oil leaks, more pressure in the crankcase, a strange noise, etc.

To fix it, you have to replace it.

Final Thoughts

White smoke tends to be concerning, but it’s usually an easy fix. Far more dangerous for your lawnmower is blue or black smoke. With white smoke, it’s just a matter of fixing a simple issue and letting the engine run until the smoke is no longer there.

Keep in mind that new lawnmowers tend to blow white smoke for a while until they get started and adapt to everything. So, don’t get alarmed if you see this on your first mowing round with your new mower.

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ReadyToDIY is the owner of this article. This post was published on 2020-05-25.

Why Is My Lawnmower Blowing White Smoke – Beginner’s Guide

First things first – if your lawnmower is blowing smoke, irrespective of its color, there is clearly something wrong. In this article, we FOCUS on the occurrence of white smoke in particular which happens to be emanating from your lawn mower.

Once you know the reasons behind the emission of this white colored smoke, you will in turn be in a good position to resolve the problem.

Therefore, without further ado, we get down to answering your question as to “Why is my lawnmower blowing white smoke?”

Don’t Panic!

Now, before we give you a thorough background on the reasons for which white smoke could be billowing out of your lawn mower it is really important that you DO NOT panic.

Remain calm; irrespective of the reasons, for which your lawnmower may be blowing white smoke, they are all easily addressable. Therefore, sit back while we examine each of those reasons.

Over Enthusiastic Cleaning

One of the most common reasons for which lawnmowers end up blowing white smoke while operating them is because you went a little overboard with your cleaning regimen. This is especially true when you tip your lawn mower over so that you could thoroughly scrub its deck while also unclogging its chute which may have got blocked.

Now, in this entire process, there is every chance that oil ended up getting into the cylinder. Once your cleaning regimen is complete, once you fire up your lawn mower, this oil will start to burn, thus causing the white smoke that you see.

Solution?

Well, the solution lies in avoiding tipping your lawn mower while cleaning. We understand that this can be hard. So, the right thing for you to do would be to tip it carefully, applying adequate caution such that oil does not end up entering the cylinder.

Other Situations where Oil Enters the Cylinder

While excess cleaning is definitely one of the most common reasons for which oil ends up entering the cylinder, it is definitely not the only one.

Another frequently observed scenario is while mowing uphill. Due to the resultant trajectory, oil frequently enters the cylinder in such cases, especially if you have been mowing uphill for a while.

Herein, the solution would simply be to assess the elevation at which you have been mowing, in case you observe white smoke blowing from your lawn mower.

Video on White Smoke Blowing from Lawn Mowers

While we are on this topic, a video which we recommend you check out on white smoke blowing from lawn mowers:

Excess Engine Oil

Another common reason for which you might notice white smoke blowing out of your lawnmower is when you’ve filled in way too much engine oil into it. This often happens in case of tractor mowers although it can be the case with any type of lawnmower.

The solution in this instance would of course be rather elementary, viz. you take adequate caution while filling engine oil into your lawnmower so as to not go overboard. Most lawnmowers anyway have specifications about the amount of engine oil which is to be put into them; make sure you abide by them. Further, those levels are indicated on the lawnmowers themselves, making it even simpler for you to ensure that you do not fill in excess engine oil.

Problem in the Carburetor

Another reason you are likely to see white smoke blowing out of your lawn mower is because there is a problem in the carburetor. These problems could take the shape of:

No matter which of these is the trigger behind the carburetor issues in your lawn mower, it can easily be fixed.

In the first problematic scenario, if gas is mixing up with the oil in your lawn mower, then the issue is quite likely in the carburetor seal. This can either be repaired or replaced, depending on the extent of the problem. Bear in mind that once you have done the needful, you will have to change the oil in your lawn mower as well since in its current form, it won’t be usable.

Further, if your carburetor is blocked, you can clean it yourself. If you are wondering how to go about doing so, you can easily take the help of many guides and tutorials available online at no charge.

Likewise, a carburetor which is way too damaged clearly requires replacement with a new one. Again, you will find the process of replacing with a new carburetor rather easy.

Incorrect Grade of Oil

When it comes to engine oil in just about any machine – such as your car for example, the grade of oil put into it really matters. In case of lawn mowers for example, there are very specific oil grades that you can use on them.

over, within lawn mowers, the type and make often determines the oil grade to be used.

Incorrect grade of oil can possibly lead to the emission of white smoke when you run your lawn mower.

Therefore, the solution is clearly to use the correct engine oil grade. This would be specified in the manual and/or packaging of your lawn mower.

Blown Head Gasket

A common reason for white smoke to emanate out of your lawn mower is the head gasket being blown away. This is especially true if you find that your lawn mower refuses to start after emanating white smoke.

In this case, a simple act of replacing the head gasket should do the job.

Moisture

Finally, there is the possibility of moisture entering key areas of your lawn mower, especially fuel compartments. This can often lead to white smoke blowing from your lawn mower.

Operating your lawn mower in the rain can lead to moisture getting into it. This can also happen while you are giving your lawn mower a thorough clean. Moisture can also accumulate on its own, in humid conditions.

While there is no clear solution per se, you simply need to check for this, in case of white smoke blowing out of your lawn mower and then suitably remove this accumulated moisture.

Conclusion

As you can see, there are myriad arrays of reasons for which your lawn mower can blow white smoke.

Therefore, the next time you happen to find yourself wondering as to “Why is my lawnmower blowing white smoke?” think of all the reasons we have highlighted above.