How To Tell If A Riding Lawn Mower Engine Is Seized? [Effective Tips]

How To Tell If A Riding Lawn Mower Engine Is Seized

You’re probably familiar with the frustration of having to restart your riding lawn mower every time you need to stop.

But what do you do when your mower engine is seized and won’t turn over, no matter how many times you try? 

We’ve compiled some tips for determining whether the engine is seized, and what to do if it is.

What Causes A Lawn Mower Engine To Become Blocked?

What Causes A Lawn Mower Engine To Become Blocked

The engine is made up of many moving parts and when one of these parts ceases to move, the engine seizes. There are a few main reasons that this can happen:

First Reason: Lack Of Oil

One of the most common reasons for an engine to seize is a lack of oil. If the engine doesn’t have enough oil, the metal parts will start to grind against each other and eventually seize up.

Second Reason: Dirt And Debris

Another common reason for an engine to seize is when there is too much dirt or debris in the engine. This can happen if the lawnmower isn’t cleaned regularly or if it’s been stored in a dirty area.

Third Reason: Worn Out Parts

The parts of the engine wear out over time and eventually won’t work anymore. Most riding lawn mower engines have a built-in life expectancy, after which the parts will become worn out and it won’t be able to start.

Fourth Reason: Overheating

If the engine overheats, it can seize up. This is often caused by a lack of oil or by an issue with the cooling system.

Fifth Reasons: Lack Of Use

Riding lawn mowers often sit for a long period without being used. This lack of use can cause the engine to seize. In order to avoid this, it’s recommended that riding lawn mowers are started every 2-3 weeks during storage periods.

Sixth Reason: Frozen Fuel

If the fuel line becomes frozen, the engine will not be able to start. This is most likely to happen in colder climates.

Last Reason: Lack Of Spark

A lack of spark can cause the engine to stop. There are many reasons why the engine might not have any spark, including a faulty coil or worn-out ignition components.

Now that you know some of the common causes for an engine to seize, you might be wondering how exactly to tell if your riding lawn mower

What Are The Signs That A Lawn Mower Engine Is Seized?

What Are The Signs That A Lawn Mower Engine Is Seized

The most noticeable sign that a lawnmower engine has seized is if you try to start it and it won’t turn over at all. If you turn the key and nothing happens, then there is a good chance that your lawnmower engine has seized up.

That being said, there are several other signs to look for if you want to tell if your riding lawn mower engine is seized. For example, you may notice that the engine runs roughly or that it makes a loud knocking noise. It may also release a trail of smoke out the back and/or leave oil spots on the ground outside where you park it.

If you decide to try and unseized your lawn mower engine, remember to always wear protective gloves and eyewear – especially if you’re trying to do it by hand! Otherwise, there are other options that are much safer, including using an engine block heater or a propane heater.

What Are The Benefits Of Having Your Lawn Mower Engine Unseized?

There are many benefits to having your riding lawn mower engine unseized. For example, you can save money by preventing further damage to the engine. 

You can also extend the life of your lawnmower since it won’t be forced to sit idle – which is what happens when an engine seizes. Additionally, your riding lawn mower will feel like new again and you’ll be able to use it without any problems.

Recommend Our Top Pick- Riding Lawn Mowers

Here is our top pick:

# Husqvarna YTH18542 42 in 18.5 HP Briggs & Stratton Hydrostatic Riding Mower 

Husqvarna YTH18542 42 in 18.5 HP Briggs & Stratton Hydrostatic Riding Mower 


  • Easy to understand
  • Easy to bump
  • Powerful performance
  • Foot pedal-operated hydrostatic transmission
  • Tight 16 in. Turning radius
  • Electric cutting deck engagement 

Our Review:

If you’re in the market for a new lawn mower, then there is NO better way to start than with this model by Husqvarna!

It has so many features that it’s hard to believe this was actually released. For example, it comes with an easy-to-understand control panel and is extremely easy to bump perfectly for those who are a little less experienced with lawn mowers.

Additionally, it has a powerful performance and can turn on a dime with its tight 16 in. Turning radius. Finally, the deck engages with just the touch of a button, making it super easy to use.

Overall, we highly recommend this model to anyone looking for a durable, reliable, and easy-to-use lawn mower. It’s perfect for small to medium-sized yards and is sure to make your lawn care a breeze!


  • 18.5 HP Briggs 
  • Stratton Intek V-Twin engine
  • Easy starting
  • Powerful performances


  • Not the cheapest option

Final Thoughts:

This is the perfect lawn mower for those who are looking for a durable and reliable machine. It’s easy to start, has powerful performance, and turns on a dime. Plus, it comes with an electric cutting deck engagement which makes it super easy to use.

However, it is not the cheapest option on the market. If you’re looking for a high-quality machine that will last you for years to come, then this is a perfect choice!

We have a related article for you, you can read more How To Fix Self-Propelled Lawn Mower Cable? [Effective Steps & Tips].