You’re ready to tackle your lawn, but instead of a satisfying roar, your lawn mower coughs up a plume of oily smoke. A lawn mower spitting out oil is a common problem, and it’s usually not a sign of impending doom. This article will explore the common causes of oil expulsion from your lawnmower, explain why it happens, and guide you through potential solutions. We’ll also delve into preventative measures to keep your mower running smoothly and oil-free.
In short, your lawnmower is spitting out oil because there is an issue with its internal system that is causing excess oil to be forced out. This can be due to a variety of factors, including a faulty piston rings, a clogged air filter, or even a damaged crankcase vent.
Why Is My Lawn Mower Spitting Out Oil? Common Causes and Solutions
There are several reasons why your lawnmower might be spitting out oil. Understanding the cause is crucial to finding the right solution:
1. Worn or Damaged Piston Rings
What Happens:
Piston rings are thin metal bands that sit within the cylinder walls. Their primary role is to create a tight seal to prevent oil from seeping into the combustion chamber. As these rings wear out, the seal weakens, allowing oil to escape.
Why It Matters:
This oil enters the combustion chamber and burns, producing the blue smoke you see coming from the exhaust. It can lead to engine damage if left unchecked.
How to Fix:
Replacing the piston rings usually requires a complete engine rebuild, a job best left to experienced mechanics.
2. Clogged Air Filter
What Happens:
A clogged air filter restricts airflow to the engine. This can create a vacuum effect that draws oil from the crankcase into the combustion chamber.
Why It Matters:
A clogged air filter can cause engine misfires, reduced power, and excessive oil consumption.
How to Fix:
The solution is simple: replace the air filter.
3. Damaged Crankcase Vent
What Happens:
The crankcase vent allows excess pressure in the crankcase to escape. When it’s damaged or blocked, pressure can build up, forcing oil out.
Why It Matters:
A damaged crankcase vent can cause oil leaks and reduce engine performance.
How to Fix:
You might need to replace the vent or clear any blockage.
4. Overfilling with Oil
What Happens:
Adding too much oil to the crankcase can lead to it being pushed out through the vent or other openings.
Why It Matters:
Overfilling can cause oil to enter the combustion chamber, leading to a variety of issues.
How to Fix:
Ensure you are using the correct type and amount of oil as specified in your owner’s manual. Drain excess oil if needed.
5. Worn Engine Components
What Happens:
As engine components like bearings and seals wear out, they can allow oil to leak into the combustion chamber.
Why It Matters:
Worn engine components can lead to reduced engine performance and eventually engine failure.
How to Fix:
Replacing worn components is usually necessary, which may require a major engine overhaul.
6. Damaged Engine Block
What Happens:
A crack or other damage to the engine block can allow oil to leak into the combustion chamber.
Why It Matters:
A damaged engine block is a serious problem that can lead to engine failure.
How to Fix:
Repairing a damaged engine block may not be feasible, and you might need to replace the entire engine.
Preventative Maintenance for Your Lawn Mower
Preventing oil issues is crucial for keeping your mower running smoothly. Here are some preventative maintenance tips:
- Regular Oil Changes: Change the oil at the intervals recommended by your manufacturer. This helps prevent oil breakdown and sludge buildup.
- Check the Air Filter Regularly: Replace the air filter when it becomes dirty or clogged.
- Inspect the Crankcase Vent: Make sure the vent is not blocked or damaged. Clean it as needed.
- Avoid Overfilling: Stick to the recommended oil level in your owner’s manual.
- Keep the Mower Clean: Regularly remove dirt and debris that can clog the engine components.
When to Seek Professional Help
While some of these problems can be addressed with basic DIY knowledge, others require professional help. Here’s when to consult a mechanic:
- Visible Oil Leaks: If you see significant oil leaks from the engine, it’s best to have a mechanic diagnose the problem.
- Engine Overheating: If your engine overheats, it can be a sign of a serious problem, and professional intervention is required.
- Blue Smoke: If you notice significant blue smoke coming from the exhaust, it might indicate a problem with piston rings or other engine components.
Conclusion: Your Lawn Mower’s Oil Troubleshooter
A lawn mower spitting out oil is a common problem that can often be resolved with simple solutions. By understanding the common causes and preventative measures, you can keep your mower running smoothly and avoid costly repairs. Remember to consult a professional mechanic if you suspect a serious engine problem. With proper care and maintenance, you can enjoy a healthy, oil-free lawnmowing experience for years to come.
FAQ
1. What does it mean when my lawn mower spits out oil?
If your lawn mower is spitting out oil, it’s a clear sign that there’s a problem with your engine. This usually indicates a buildup of pressure in the crankcase, which can be caused by various factors, including a faulty piston rings, a worn-out valve stem seal, or a blocked breather tube. Oil spitting can also be an indicator of overfilling the crankcase with oil, exceeding the recommended oil level.
2. Is it safe to run my lawn mower if it’s spitting out oil?
No, it is not safe to run your lawn mower if it’s spitting out oil. This is a sign of a potential engine failure and can lead to serious damage, including a blown engine. Continuing to run the mower could also lead to oil leaks and fire hazards.
3. What should I do if my lawn mower is spitting out oil?
The first step is to stop using the mower immediately. Inspect the engine for any visible leaks or signs of oil buildup. Check the oil level and ensure it’s within the recommended range. If the problem persists, it’s best to consult a qualified mechanic or lawn mower repair specialist for diagnosis and repair.
4. How can I prevent my lawn mower from spitting out oil in the future?
Preventing oil spitting requires proper maintenance and regular inspections. Always use the recommended oil type and ensure the oil level is within the manufacturer’s guidelines. Check the breather tube for clogs and replace it if necessary. Regularly inspect the valve stem seals and piston rings for wear and tear.
5. What are the common causes of oil spitting in lawn mowers?
Common causes of oil spitting in lawn mowers include worn-out piston rings, faulty valve stem seals, a clogged breather tube, and overfilling the crankcase with oil. These issues can lead to increased pressure in the crankcase, forcing oil out of the engine.
6. How expensive is it to fix a lawn mower that spits out oil?
The cost of fixing a lawn mower that spits out oil can vary depending on the underlying issue and the complexity of the repair. Simple repairs, such as cleaning a clogged breather tube, may be inexpensive. However, replacing worn-out piston rings or valve stem seals can be more costly.
7. What are some tips for maintaining my lawn mower to prevent oil spitting?
To prevent oil spitting, follow these maintenance tips:
* Use the recommended type and amount of oil.
* Regularly check the oil level and top it up as needed.
* Inspect the breather tube for clogs and clean or replace it.
* Have the piston rings and valve stem seals inspected and replaced if necessary.
* Avoid overfilling the crankcase with oil.