Addressing Oil Leaks in Lawnmowers

by Raymond Archambault

Your lawnmower can be leaking oil from its exhaust if it’s not properly maintained. If you’re using a gasoline-powered machine, don’t be alarmed; this does happen occasionally. This issue should be resolved as soon as possible, though.

If your lawnmower is spilling oil, there are various explanations for this. Some of the most common causes are an overfilled crankcase, a faulty piston ring, or fluid shifting when the tool is tilted on its side. To swiftly cure an oil leak, you must first determine the source of the leak.

We’ll go through all the main explanations for why oil is escaping from lawnmower exhausts in this post. It is possible to restore the mower to working order by identifying the source of the problem and then implementing the provided solution.

Addressing Oil Leaks in Lawnmowers

Why Does Oil Leak from the Mower’s Exhaust?

As soon as you start your lawnmower, it warms up four components: cylinders and piston heads; exhaust manifolds and exhaust pipes; and the combustion chamber. Oxygen and fuel are then pumped into the piston, which compresses and erupts the gas, driving it out of the exhaust.

All the moving components are kept lubricated by oil. Oil may leak from the lawnmower’s muffler if one or more of its internal components is broken or has reached the end of its lifespan.

Top Reasons Behind Mower Oil Leaks

Damaged Piston Ring:

One of the most important pieces of your lawnmower is the piston. Using fuel and oxygen, it ensures that the machine can run at full capacity. Oil is required to lubricate the pistons because of how frequently they move.

The term “piston ring” refers to an oil-sealing rubber component. The liquid will drop if the seal is broken or worn out. This ring can survive for many years, but it may lose its ability to hold oil if it is not properly maintained. When the piston’s oil sludges, it will begin to ooze out of the exhaust.

Solution: The piston ring should be replaced.

Overfilled Crankcase:

An essential component of your lawnmower’s engine is the crankshaft, which is housed in the case. Shaft lubrication takes up most of the oil that is stored in the mower when it is turned on. Nonetheless, you don’t need to overfill your machine. A lawnmower that has been overfilled with oil will emit gasoline through the exhaust if the tank is overfilled.

Solution: clean the carburetor and make sure not to overfill the next time.

Filthy air filter:

A lawnmower’s exhaust may be leaking oil because of an over soaked filter. In order for the combustion process to be completed, the engine needs an air filter. And what happens if the filter is really dusty? There will be more gas in the system if there isn’t enough air movement. The muffler acts as a conduit for the surplus liquid, which eventually makes its way to the exhaust. The mower may appear to be spilling oil, but it’s actually leaking gasoline.

Solution: Swap the air filter out with a new one

Worn or end of life valves:

Each of the two valves on a mower’s engine is responsible for the intake and exhaust processes. These valves may begin to fail after a few years of frequent use. Therefore, the cylinders won’t be completely sealed when the mower is running. As a result, oil is emitted from the exhaust.

Solution: Repair the valves if possible or replace them

Tipped lawnmower:

A self-propelled or walk-behind mower that is tilted on its side may spill oil into the exhaust. Leaning the mower too much forward or backward might allow oil to leak into its carburetor or exhaust system, which can cause problems.

Solution: When using the mower, be sure the carburetor is kept on the high side to avoid damaging the machine.

Blown head gaskets:

The mower’s engine heads are obstructed by head gaskets. Thus, the route between heads and blocks is sealed. As a result, when the gaskets are worn out or at the end of their service life, the exhaust is flooded.

Solution: What to do if your lawnmower can operate for more than 15 minutes without overheating is to use Visbella’s gasket sealant maker. However, if the engine overheats within 15 minutes of operating, you must replace the gaskets.

Cracked Engine Block:

The engine block houses all the internal components and provides a passageway for oil to reach them. If there are breaks in this block, fluid will leak out, and you’ll see gasoline flowing out of the lawnmower’s exhaust. In addition, the mower will not work as expected; it will overheat and generate additional sounds when in use.

Solution: Consult a mower specialist for maintenance or repair

Person Holding Black and Gray Lawn Mower

Tips to Prevent Oil Leaks in Lawnmowers

  • Maintaining the mower on a regular basis can help to keep any oil leaks at bay.
  • Make sure the oil tank is not overfilled.
  • Clean the engine with the carburetor facing up. Make sure you don’t tilt it more than 15 degrees. If you don’t do this, the oil will spread, and eventually, it will seep out of the exhaust.
  • Keep an eye on the air and fuel filters. Spray some carburetor cleaning solution into the carburetor to remove the grime and ensure that the leaking liquid does not attract further dirt.

If you are a novice and are unable to resolve any of the issues listed above, you should seek the advice of an expert.

Dangers of Oil Leaks

  • Burning oil penetrates different interior components, causing white smoke, which then dissipates. These noxious emissions are detrimental to health and bad for the environment.
  • There will be dead grass if fluid is dripped on lawn grasses. Because of this, your yard will seem unkempt and overgrown.
  • The engine may be difficult to start because of an excessive amount of oil in the tank.
  • There is a risk of fire from the exhaust of a lawnmower because the fuel it releases is combustible.

Wrapping Up

You now understand why your lawnmower is leaking oil from the exhaust and how to address the problem yourself. So, if the mowing equipment has a leak, you can immediately fix it. As a newbie, it’s best to seek advice from someone more experienced.

Lawnmowers and their upkeep aren’t important to some property owners. However, this isn’t the accurate approach to go about it. In order to extend the life of your lawnmower, you must spend some time maintaining it.


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