Every lawn owner faces this simple question at some point: can lawn mower get wet? While lawn mowers can handle morning dew, getting one thoroughly soaked may lead to starting problems. Water and the electrical or mechanical components of your mower simply don’t mix well. This article will guide you through what happens when your mower gets wet, how to handle it, and the best practices to keep it running smoothly.
Can Lawn Mower Get Wet
The short answer is yes, but it’s complicated. Modern lawn mowers are built to withstand typical yard conditions like damp grass or light dew. However, they are not waterproof. Exposure to heavy rain, being left outside in a storm, or an accidental soaking from a sprinkler can cause significant issues. The severity of the damage depends on the type of mower you have and how wet it became.
Understanding The Different Mower Types And Water Resistance
Not all mowers are created equal when it comes to moisture. Their design dictates how vulnerable they are.
Gas-Powered Lawn Mowers
These are the most common and also the most complex when wet. The main concerns are:
- The Engine: Water can enter the air intake or the cylinder, leading to hydro-lock, which can bend engine components.
- The Electrical System: The spark plug, ignition coil, and wiring can short out, preventing the mower from starting.
- The Fuel System: Water can contaminate the gas tank or carburetor, causing performance issues or corrosion.
Electric Corded Mowers
These are the most dangerous to use in wet conditions. The combination of a live electrical cord, water, and you holding the handle is a serious shock hazard. You should never use a corded mower on wet grass or in the rain.
Battery-Powered (Cordless) Mowers
While more water-resistant than corded models, they are not submersible. The battery terminals and connections can corrode if wet. The motor is usually sealed, but prolonged exposure to moisture isn’t recommended.
Manual Reel Mowers
These are the safest bet for wet grass, as they have no engine or electrical parts. The primary risk is rust on the blades and metal frame, which can be managed with proper drying and maintenance.
Immediate Steps To Take If Your Lawn Mower Gets Soaked
If your mower has been caught in a downpour or you’ve accidentally doused it, don’t try to start it. Follow these steps immediately:
- Move it to a dry, covered area like a garage or shed.
- Disconnect the spark plug wire on a gas mower or remove the battery from an electric model. This is a critical safety step.
- Tip the mower on its side (with the air filter and carburetor facing UP to prevent oil and fuel leaks) to allow water to drain from the deck.
- Use dry towels or rags to wipe down the entire exterior, including the handle, deck, and wheels.
- Let the mower air dry completely for at least 24-48 hours in a well-ventilated space.
How To Dry A Wet Lawn Mower Engine And Electrical System
After the initial steps, you need to focus on the critical internal components. Patience is key here; starting the engine too soon can cause permanent damage.
For the engine and electrical parts on a gas mower:
- Remove the spark plug. Crank the engine over a few times by pulling the starter cord to expel any water from the cylinder.
- Spray a small amount of moisture-displacing lubricant (like WD-40) into the spark plug hole.
- Clean and dry the spark plug itself with a wire brush and cloth. You can also lightly heat it with a hairdryer to evaporate moisture.
- Check the air filter. If it’s a paper filter and is soaked, you must replace it. A foam filter can be washed, dried, and re-oiled.
- Inspect all visible wiring for water droplets and gently dry them.
For battery-powered mowers, carefully dry the battery compartment and all connection points. Ensure the battery is completely dry before attempting to recharge it, as charging a wet lithium-ion battery can be hazardous.
Common Problems After A Lawn Mower Gets Wet
Even after drying, you might encounter these issues:
- It Won’t Start: This is the most common problem, usually due to a wet spark plug, shorted ignition coil, or water in the fuel.
- Rough Running or Sputtering: Often caused by water-contaminated fuel in the carburetor or a damp air filter.
- Rust Formation: Metal parts, especially the underside of the deck and the cutting blade, will begin to rust quickly if not dried properly.
- Electrical Shorts: In electric mowers, this can permenently damage the motor or control circuitry.
Preventative Measures To Protect Your Mower From Water Damage
Prevention is always easier than repair. Adopt these habits to keep your mower safe.
Proper Storage Is Essential
Always store your mower in a dry, covered location. A garage, shed, or under a specialized waterproof cover is ideal. Never leave it sitting on a wet lawn overnight.
Mowing In Wet Conditions
Avoid mowing while it’s raining or when the grass is soaking wet. Not only is it risky for the mower, but it tears the grass, leads to clumping, and can harm your lawn’s health. Wait for the grass to dry after a rainfall.
Cleaning Your Mower Safely
When cleaning grass clippings from the deck, never use a high-pressure hose directly on the engine or electrical areas. Tip the mower (correctly) and use a brush or a gentle stream of water from the side, followed by immediate drying.
Regular Maintenance Checks
Regularly check for and clear debris. Apply a silicone spray or light oil to metal components to create a moisture barrier. Keep the fuel tank full during storage to prevent condensation inside the tank.
When To Call A Professional For Help
If you’ve followed all drying steps and your mower still fails to start or run properly, it’s time to seek help. A small engine repair technician can diagnose issues like:
- Internal engine corrosion or hydro-lock damage.
- Carburetor cleaning and rebuild due to water in the fuel.
- Replacing faulty electrical components like the ignition coil.
- Repairing a damaged electric motor in cordless or corded models.
Trying to fix complex internal problems without experience can often make things worse and more expensive.
Frequently Asked Questions
Can I leave my lawn mower outside in the rain?
No, you should not leave any lawn mower outside in the rain. Prolonged exposure will lead to rust, electrical damage, and starting issues. Always store it in a dry place.
What should I do if my lawn mower gets wet and won’t start?
Follow the drying steps outlined above, focusing on the spark plug, air filter, and fuel system. If it still won’t start after thorough drying, the problem is likely internal, and you should consult a professional.
Is it safe to mow wet grass with an electric mower?
It is not safe to mow wet grass with a corded electric mower due to the high risk of electric shock. For battery mowers, check the manufacturer’s guidelines, but it’s generally advised to avoid very wet conditions to protect the battery and motor.
How can I dry out a wet lawn mower engine quickly?
Use absorbant towels, compressed air to blow out crevices, and a fan to circulate air. You can use a hairdryer on a cool setting but avoid high heat near fuel or electrical parts. The key is thorough air circulation, not just heat.
Will water ruin a lawn mower engine?
It can. If water enters the combustion chamber (hydro-lock), it can bend the connecting rod or crack the piston because water does not compress. Water in the fuel or electrical system will also cause performance failures and corrosion over time.