Tag Archives: Flywheel

How Do I Check The Flywheel Key On My Snowblower?

So, you’ve got yourself a snowblower and you’re ready to tackle those winter storms head-on. But wait, before you rev up your machine and start plowing through the snow, there’s one important thing you need to check – the flywheel key. Now, you might be wondering, what is a flywheel key and why is it important? Well, my friend, in this article, we’ll break it down for you and walk you through the steps of how to check the flywheel key on your snowblower. Don’t worry, it’s easier than you think, and with a little bit of know-how, you’ll be all set to conquer the winter wonderland in no time!

How Do I Check The Flywheel Key On My Snowblower?

Why is the Flywheel Key Important?

What is a flywheel key?

A flywheel key is a small piece of metal, often in the shape of a small rectangular bar or a half-moon, that connects the engine’s flywheel to the crankshaft. It is a crucial component in small engines, such as those found in snowblowers, lawnmowers, and other garden equipment.

What is the purpose of the flywheel key?

The main purpose of the flywheel key is to ensure that the flywheel and the crankshaft are properly aligned. This alignment is essential for the engine to function smoothly and efficiently. The flywheel key acts as a shear pin, designed to break or shear off in case of sudden impacts or excessive force being applied to the rotating assembly. This helps to prevent more significant damage to the engine.

What happens if the flywheel key is damaged or sheared?

If the flywheel key is damaged or sheared, it can lead to significant issues with the engine’s performance. When the flywheel and crankshaft are not properly aligned, it can cause the engine to run rough, produce excessive vibrations, or even fail to start. Additionally, a damaged flywheel key may cause the engine’s timing to be off, resulting in poor fuel efficiency, decreased power, and potentially severe engine damage if not addressed promptly.

Tools Required for Checking the Flywheel Key

Safety Precautions

Before attempting to check the flywheel key on your snowblower, it is crucial to take some safety precautions. First and foremost, always make sure the engine is turned off and the spark plug wire is disconnected to prevent accidental starting. Additionally, it is recommended to wear safety goggles and gloves to protect yourself from any potential injuries.

Necessary tools

To check the flywheel key, you will need a few basic tools:

  1. Socket wrench or a set of wrenches – to remove the blower housing.
  2. Screwdriver – to remove any screws holding the blower housing in place.
  3. Flywheel puller (optional) – if you encounter difficulty removing the flywheel.

How Do I Check The Flywheel Key On My Snowblower?

Steps to Check the Flywheel Key

Step 1: Disconnect the spark plug wire

Safety is always the first priority. Begin by removing the spark plug wire from the spark plug to prevent accidental starting while working on the snowblower.

Step 2: Remove the blower housing

Using a socket wrench or a set of wrenches, carefully remove the bolts or screws that hold the blower housing in place. Set the housing aside, making sure not to misplace any screws or small parts.

Step 3: Locate the flywheel key

Once the blower housing is removed, you will have a clear view of the flywheel. The flywheel key is usually located between the flywheel and the crankshaft. It may appear as a small metal piece or partially sheared off, depending on its condition.

Step 4: Inspect the flywheel key

Carefully inspect the flywheel key for any signs of damage or shearing. Look for cracks, chips, or any other noticeable issues. A damaged or sheared flywheel key will need to be replaced to ensure proper engine operation.

Step 5: Replace the flywheel key if necessary

If you discover that the flywheel key is damaged or sheared, it is crucial to replace it promptly. You can find a replacement flywheel key at a local hardware store or from the manufacturer. Follow the manufacturer’s instructions to correctly install the new flywheel key. Make sure it is properly aligned with the crankshaft and secure it in place.

Tips and Tricks for Checking the Flywheel Key

Inspect other components while the blower housing is off

While you have the blower housing off to check the flywheel key, it is an excellent opportunity to inspect other components of the snowblower. Look for any loose bolts, damaged wires, or signs of wear and tear. Addressing these issues proactively can help prevent future problems and extend the life of your snowblower.

Clean the flywheel and key before reinstallation

Before reinstalling the blower housing, take a moment to clean the flywheel and the flywheel key. Remove any dirt, debris, or oil that may have accumulated on these components. This will ensure a proper fit and alignment when reinstalling the flywheel and key.

Common Issues and FAQs

What are the signs of a damaged flywheel key?

Some common signs of a damaged flywheel key include rough engine running, excessive vibrations, difficulty starting the engine, or an engine that runs but lacks power. If you experience any of these issues, it is recommended to check the flywheel key as part of your troubleshooting process.

Can I repair a sheared flywheel key?

In most cases, a sheared flywheel key cannot be repaired and will need to be replaced. Due to safety reasons, it is best to replace the flywheel key rather than attempting to repair it yourself. Replacement flywheel keys are generally inexpensive and readily available.

How often should I check the flywheel key?

As part of regular maintenance, it is recommended to check the flywheel key on your snowblower at least once a year. However, if you notice any performance issues or suspect damage to the flywheel key, it is essential to check it immediately.


The flywheel key plays a critical role in the smooth operation of your snowblower’s engine. By understanding its importance and following the steps outlined in this article, you can effectively check the flywheel key to ensure that it is in proper working condition. Regular maintenance and prompt replacement of a damaged or sheared flywheel key will help keep your snowblower running smoothly and prevent more significant engine issues down the line. Remember to prioritize safety and take necessary precautions before starting any maintenance tasks on your snowblower.