Step-By-Step Guide: How To Check A Lawn Mower Coil

Quick Answer: To check a lawn mower coil, you can use a multimeter to test its resistance. A faulty coil can cause your lawn mower to fail to start or run unevenly. By testing the coil, you can determine if it needs to be replaced or if the issue lies elsewhere.

Introduction:

Have you ever experienced the frustration of trying to start your lawn mower, only to find that it refuses to fire up? Perhaps it starts, but then runs so unevenly that you worry about damaging the engine. These problems can often be traced back to a faulty ignition coil.

The ignition coil is a vital component of your lawn mower’s ignition system, responsible for generating the high voltage needed to power the spark plug. Over time, this coil can degrade or fail, leading to starting and performance issues.

But fear not! Checking your lawn mower’s coil is a straightforward process that you can easily do yourself. In this article, we will guide you through the steps of testing your coil using a multimeter, so you can diagnose if it’s the source of your mower’s troubles. Let’s dive right in!

Step-by-Step Guide: How to Check a Lawn Mower Coil

How to Check a Lawn Mower Coil

Introduction

The lawn mower coil is an essential component in the ignition system of your lawn mower. It is responsible for generating the high voltage needed to create a spark that ignites the fuel in the engine. If your lawn mower is experiencing starting issues or misfires, it could be due to a faulty coil. In this article, we will guide you through the process of checking a lawn mower coil to determine if it is functioning properly.

1. Understanding the Lawn Mower Coil

Before diving into the diagnostic process, it’s important to have a basic understanding of the lawn mower coil. The coil is typically a small, cylindrical device made up of primary and secondary windings. The primary winding is connected to the ignition switch, while the secondary winding is connected to the spark plug.

1.1. Primary Winding

The primary winding consists of a few hundred turns of copper wire. When an electrical current flows through the primary winding, it generates a magnetic field. This magnetic field is essential for the functioning of the coil.

1.2. Secondary Winding

The secondary winding consists of thousands of turns of much finer wire. The magnetic field generated by the primary winding induces a high voltage in the secondary winding. This high voltage is then sent to the spark plug, creating the spark that ignites the fuel.

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2. Signs of a Faulty Lawn Mower Coil

Before proceeding with the testing process, it’s important to identify the common signs of a faulty lawn mower coil. Here are some indicators that your coil might be malfunctioning:

  • Lawn mower fails to start or is difficult to start
  • Frequent misfires and backfires
  • Loss of power during operation
  • Inconsistent spark or weak spark at the spark plug
  • Visible damage or corrosion on the coil

If you notice any of these signs, it’s time to check the lawn mower coil.

3. Gathering the Tools

Before you begin testing the lawn mower coil, gather the necessary tools and equipment:

  • Safety goggles
  • Gloves
  • Multimeter
  • Small flathead screwdriver
  • Socket wrench set
  • Spark plug wrench
  • Replacement coil (optional, depending on the results of the test)

4. Testing the Lawn Mower Coil

Now it’s time to check the lawn mower coil. Follow these steps to determine if your coil is working correctly:

4.1. Step 1 – Safety First

Ensure your safety by wearing goggles and gloves to protect your eyes and hands from any potential harm during the testing process. Safety should always be a priority when working with electrical components.

4.2. Step 2 – Disconnect the Spark Plug and Battery

Before proceeding, disconnect the spark plug wire from the spark plug to prevent accidental starting. Additionally, disconnect the battery to eliminate any risk of electric shock.

4.3. Step 3 – Locate the Coil

Locate the lawn mower coil, which is usually mounted near the engine. Refer to your lawn mower’s manual for specific instructions if needed.

4.4. Step 4 – Inspect the Coil

Carefully examine the coil for any visible signs of damage, such as cracks, corrosion, or loose connections. If you notice any issues, it’s likely that the coil needs to be replaced.

4.5. Step 5 – Test the Primary Winding

Using a multimeter set to the resistance (ohms) setting, touch the multimeter probes to the terminals of the primary winding. A functioning coil should display a resistance reading within the manufacturer’s specified range. If the reading is significantly higher or lower, the coil may be faulty and require replacement.

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4.6. Step 6 – Test the Secondary Winding

To test the secondary winding, set the multimeter to the highest voltage setting. Place one probe on the coil’s lead wire and the other probe on a metal part of the engine. Pull the starter cord to create a spark. If you observe a strong, blue spark, the secondary winding is working properly. However, if there is no spark or the spark is weak and inconsistent, the coil may be faulty.

5. Replacing the Lawn Mower Coil

If the tests confirm a faulty lawn mower coil, it’s time to replace it. Follow these steps to ensure a smooth replacement process:

5.1. Step 1 – Purchase a Replacement Coil

Obtain a suitable replacement coil from a reputable supplier or your local lawn mower parts store. Make sure to provide your lawn mower’s model and serial number to ensure compatibility.

5.2. Step 2 – Disconnect the Spark Plug Wire and Battery

Once again, disconnect the spark plug wire and the battery to prevent accidental starting and reduce the risk of electric shock.

5.3. Step 3 – Remove the Old Coil

Using a socket wrench, carefully remove the bolts securing the old coil to the engine. Keep track of the bolts to avoid misplacement.

5.4. Step 4 – Install the New Coil

Attach the new coil to the engine using the bolts previously removed. Make sure the coil is securely fastened.

5.5. Step 5 – Reconnect the Spark Plug Wire and Battery

Reconnect the spark plug wire to the spark plug and the battery to the lawn mower.

5.6. Step 6 – Test the New Coil

After the replacement, follow the testing process outlined earlier to ensure that the new coil is functioning correctly.

Checking the lawn mower coil is a straightforward process that can help diagnose starting issues and misfires. By following the steps outlined in this article, you can determine if your lawn mower coil is faulty and needs replacement. Remember to prioritize safety throughout the testing and replacement process. Regularly checking the coil and promptly addressing any issues will help maintain the optimal functioning of your lawn mower’s ignition system.

How To Check A Simple Lawn Mower Ignition Coil

Frequently Asked Questions

How do I check a lawn mower coil?

Checking a lawn mower coil is a crucial step in troubleshooting ignition problems. Here’s how you can do it:

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What tools do I need to check a lawn mower coil?

To check a lawn mower coil, you’ll need the following tools:

– A multimeter

– A screwdriver (if required for coil removal)

Can a faulty coil cause a lawn mower to not start?

Yes, a faulty coil can prevent a lawn mower from starting. The coil is responsible for generating the spark that ignites the fuel in the engine. If it’s not functioning properly, the spark may not be generated, leading to starting issues.

How do I test the resistance of a lawn mower coil?

To test the resistance of a lawn mower coil, follow these steps:

1. Disconnect the spark plug wire.

2. Set your multimeter to the resistance (ohms) mode.

3. Place one probe on the spark plug wire terminal and the other on the coil body.

4. Check the resistance reading on the multimeter. Compare it with the manufacturer’s specifications. If the reading is significantly different, the coil may be faulty.

What should the resistance reading of a lawn mower coil be?

The resistance reading of a lawn mower coil can vary depending on the make and model. Consult your lawn mower’s manual or the manufacturer’s specifications for the recommended resistance range. In most cases, the reading should be between 2,500 and 5,000 ohms.

Can a bad spark plug cause similar symptoms to a faulty coil?

Yes, a bad spark plug can cause similar symptoms to a faulty coil. Both can result in a lack of spark, leading to difficulty in starting the lawn mower. It’s recommended to check the spark plug as well if you suspect ignition problems.

Final Thoughts

To check a lawn mower coil, start by disconnecting the spark plug wire and removing the engine cover. Locate the coil, which is usually near the flywheel. Check for any visible damage or signs of wear, such as cracks or frayed wires. Use a multimeter to test the coil’s resistance by setting it to the ohms setting and touching the meter’s leads to the coil’s terminals. If the reading is outside the manufacturer’s recommended range, you may need to replace the coil. By following these simple steps, you can easily check a lawn mower coil and ensure its proper functioning.