This is to ensure that the engine can not unintentionally start. Lubrication and cleaning might resolve the issue quickly. The main noise source of the electric mower is the deck area where the grass is cut by lawnmower blades. Step 3 This blog is written by a group of Garden Tool enthusiasts. Small Engine Troubleshooting My lawn mower won't start. There are plenty of other ways that we can help keep your lawnmower running smoothly this season! Failure to do so may result in damage to the lawn mower. If the air filter is clogged, it cant let enough air into the engine, which can cause it to backfire. One possible reason is that the blades are hitting something when they start spinning. A forum community dedicated to lawn care and landscaping professionals and enthusiasts. So this type of muffler can filter maximum noise because it has an engineering or acoustic design. I took it down to just the block and the internals but still can't determine where this noise is coming from. Make sure the engine mounting bolts are tight to the frame. How do I know if my lawn mower crankshaft is broken? When you run or switch on this machine, the engine of that machine starts. There are chances that despite changing the lawnmowers muffler, the clunking sound does not go away. Your email address will not be published. Fill the tank with fresh gas and replace the cap. Whether you're looking for a step-by-step guide on fixing an appliance or the cost of installing a fence, we've here to help. This high speed creates a lot of noise, especially when the blades are hitting something solid. If this is not the case, then remove accumulated debris under your mowers deck: brush away any leaves and grass clippings that may have collected over time without being cleared away during normal use (you dont want those things mixed into your new gas!). If there is low engine oil in the lawnmower, it may produce a knocking or clunking sound. New members: Please consider adding your location to your profile. A faulty lead may delay the spark, which will throw ignition off in the cycle of the engine, causing detonation. If that is the case, check the various nuts and bolts that keep the mowing deck in place. George Bradley. If this is the case, you may need to take the lawn mower to a mechanic to have it repaired. It can be expensive to fix, so its best to catch the problem early. Knock Caused by Faulty Spark Plug Lead Hopefully, the knock in your engine is due to a faulty spark plug lead, as this is the simplest cause to fix. Once its bent, youll notice both shaking and loud noises. Over time, this problem will only worsen until they can shear the bolt holding them in place. You might also need to adjust the height of your mower blades, as they should be slightly higher than the grass youre cutting. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. N.B: If you want to collect a quieter lawn mower, you may try (given below). If your mower has a water hose attachment, you can use it to attach a hose and clean the deck. there was a small piece of wood stuck in the intake recoil area and it was jammed in there and making noise. As you rev the engine, the frequency of the knocking increases. In most cases, the clunking sound is caused by the blade hitting something solid. The most common causes are low oil, worn piston rings, faulty spark plug and faulty carburetor. Over time, the drum bearing wears out. The engine, the blades, and the air flow all play a role. If you've recently changed the oil in your mower and the engine is emitting white or blue smoke, it's possible that some of the oil . My guess is its in the BBC, bearing going out or blade is loose. Why is my lawn mower making a loud noise? Find the loose screws and tighten them with the wrench. When the key is pressed into the start position on a riding mower, it frequently makes a heavy clicking sound or a rapid clattering sound, indicating that the battery or a part of the starting circuit are damaged. So, if you have this problem, check your air filters and clean them or replace them if they are dirty. The most common reasons why lawnmowers make a loud clanking sound include loose blades, old engine oil, or a clogged cutting deck. This can happen when the air filter is dirty. One is to check the spark plug. Hearing a lawn mower engine popping sound can be startling. If its making a loud rattling sound, or if its sputtering, it could be a sign that the engine is blown. If you do not know the exact type that your machine needs, take the worn-out damper when you buy a new one. Check if there is more movement than normal. 2. This can be due to a bad sparkplug. You will want to inspect the various pieces of your mower and tighten any loose nuts, bolts, or fasteners. The mower sounds perfect when just idling but once I move to the grass it starts knocking and if I don't pull it back it will choke out and die. 3. Before working on the blades, be sure to disconnect the spark plug and raise the deck height all the way. Usually, the crankshaft gets bent if you hit something large with the mower. Or a power washer on its lowest setting. You should also check the bearings of the front and rear wheels. If you are using a riding lawnmower, you will have to either drive your machine on blocks to access the cutting decks underside, or you can use a jungle jack to raise the whole thing high enough to access the underside. Then slide a putty knife between the front and the top panels to depress the latches located near the corners. In cold weather, the opposite happens: Gasoline can turn into an icy slush, making it harder for your engine to start. Conclusion. During the running time of the engine, the joint of body panels may vibrate and create a squeak or rattle sound. If you seriously want to decrease the noise of your existing mower, you should continue reading. Thanks 2 7 7 comments Best Add a Comment BlearRaptor 3 yr. ago A deck pulley could have gone bad. If you arent sure how to fix this issue, we will help you with this blog post. Another possible reason for the popping noise is that the engine is not getting enough oil. Loose drive belt. At the start of the new season, you should use new or fresh engine oil. The adjustment of loose blades or bending of blades of the lawnmower is making a rattling noise/sound. Sounds like the startermore specifically the bendix key. Because there are multiple culprits for this noise, well break down each option and its solution so that you can get your mower back up and running in no time. Not only are they spinning at such high RPMs all the time, but if they knock against anything besides grass (i.e., tree roots, rocks, etc. This engine is a B&S Intek 6.5 hp. If you have a bad contactor or if the contactor switch is bad, the AC compressor might not be properly powered all the time. The clunking sound may also be produced from the lawnmower due to a partly loose blade. Mowers can sputter and backfire for a variety of reasons. You might be wondering, "Why does my lawnmower sound like a helicopter?". JavaScript is disabled. Normally, a power lawn mower can make a noise that is 80 dB to 89 dB. You also love to mow the grass or level the lawn. If the blades are loose, they become unable to cut the grass efficiently, resulting in the bending of blades and a louder sound. Not cutting well; First Check For Your Mower's First Use Of The Year. You can also look at how evenly each side has been worn downif it looks like one side of your blade is getting more work than another, then it may be time to replace that particular piece. Lawnmower is making loud metal on metal sound when started wackylawnmowerman 14 years ago I was cutting the grass last summer and out of the blue the engine starting making this awful metal on metal sound. Let the mower run for a few min. The sooner you can fix your machine, the better. The most common reason for a clicking sound on a riding mower when you turn the key is a flat battery. Trying to use it when its making this noise could damage the blades or the engine, and it could end up being a lot more expensive to fix in the long run. There are some main reasons for creating that type of sound. There are different types of lawn mowers, but they all have a blade that rotates. The most common causes are low oil, worn piston rings, faulty spark plug and faulty carburetor. If the engine is not getting enough oil, it can cause the pistons to seize and the engine to stop working. Generally speaking, any rattling noise means that some parts are coming loose. If you can repair that old engine, you dont need to collect a new one. Check that all wires are connected properly. I started up the bike yesterday, and there was a clunk accompanied by a loud grinding sound. Now you want to reduce that mower noise. After the engine warms up the ticking may disappear and not show up anymore until the next morning. This may be due to a low quality of damper used in the lawnmower that cannot suppress the noise. You also know that low vibration means low noise. Together we put a lot of effort into the maintenance of our gardens over the last few years, we become obsessed with it. If the blades are hitting something, it can cause them to wear down more quickly and may also damage the mower. b. Absorptive Mufflers/Absorptive SilencersIt is a normal muffler that has no advanced engineering design. Failing engine. Turn the mower off and disconnect the spark plug cable. Take off the starter you currently have and inspect the entire flywheel by spinning the crank sprocket. I can't figure out why it's making this noise, or even where in a specific area it is making this noise. If you have recently mowed the lawn, wait for it to cool down. Your lawnmower can make loud noise due to clogging up issues, loose drive belts, old oil, lack of oil for shaft bearings, loose blades, or defective muffler. Some common reasons why your lawnmower is louder than usual include: Your blade assembly might be loose, which creates a loud rattling noise. This will allow you to turn the engine over without it sparking. If you are using a riding lawnmower, it should have a wash port on the decks top side. 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