Is your Bolens lawnmower sputtering and refusing to start? A worn-out spark plug could be the culprit. Replacing a spark plug is a relatively simple maintenance task that can significantly improve your mower’s performance. In this comprehensive guide, we’ll walk you through the entire process, from identifying the right spark plug to installing it correctly.
Overview:
Changing spark plugs on a Bolens lawnmower is a straightforward process that usually takes around 15-20 minutes. The steps involve disconnecting the spark plug wire, removing the old spark plug, installing the new spark plug, and reconnecting the wire. This guide will provide detailed instructions with clear images to help you complete the job successfully.
Step 1: Gathering Your Tools and Materials
Before you begin, you’ll need a few essential tools and materials.
- New Spark Plug: Ensure you purchase the correct spark plug for your Bolens model. Refer to your owner’s manual or contact a local hardware store for the right specification.
- Socket Wrench: A spark plug socket wrench with the correct size is essential for removing and installing the spark plug.
- Adjustable Wrench: An adjustable wrench can be useful for loosening or tightening the spark plug wire connector.
- Gloves: Protect your hands from dirt and grime.
- Safety Glasses: Always wear safety glasses to shield your eyes from potential debris.
- Shop Towel: This will be helpful for wiping away any oil or dirt.
Step 2: Locate the Spark Plug
Now, let’s find the spark plug on your Bolens lawnmower.
Identifying the Spark Plug Location:
The spark plug is typically located on top of the engine, usually near the air filter housing. If you can’t find it, consult your owner’s manual or search for a diagram online for your specific Bolens model.
Disconnecting the Spark Plug Wire:
- Safety First: Ensure the engine is completely cold and that the mower’s ignition is switched off.
- Locate the Wire: The spark plug wire is a thick, insulated wire that connects to the spark plug.
- Pull Off the Wire: Carefully pull the wire connector off the spark plug. You might need to use an adjustable wrench to loosen the connector if it’s tight.
Step 3: Removing the Old Spark Plug
With the spark plug wire disconnected, it’s time to remove the old spark plug.
Using the Socket Wrench:
- Position the Wrench: Position the socket wrench over the spark plug.
- Loosen the Spark Plug: Turn the wrench counterclockwise to loosen the spark plug. Use a firm grip, but avoid excessive force.
- Remove the Spark Plug: Once the spark plug is loosened, carefully remove it from the cylinder head.
Step 4: Inspecting the Old Spark Plug
Before installing the new spark plug, inspect the old one. This can help you diagnose any underlying engine issues.
Evaluating Wear and Tear:
- Electrode Wear: Check for excessive wear or erosion on the spark plug’s electrodes. This is a sign of a worn-out spark plug.
- Carbon Build-Up: Look for carbon buildup on the insulator, which could indicate incomplete combustion.
- Gap Setting: Ensure the spark plug gap is within the manufacturer’s specifications. If the gap is too wide or narrow, it can affect performance.
Step 5: Installing the New Spark Plug
Now that the old spark plug is out, you can install the new one.
Installing the New Spark Plug:
- Thread the Spark Plug: Carefully thread the new spark plug into the cylinder head. Ensure it is aligned correctly.
- Tighten the Spark Plug: Tighten the spark plug with the socket wrench, turning it clockwise. Use firm pressure, but don’t overtighten.
- Gap Setting: If necessary, adjust the spark plug gap according to your owner’s manual instructions.
Step 6: Reconnecting the Spark Plug Wire
The final step is reconnecting the spark plug wire.
Connecting the Spark Plug Wire:
- Align the Connector: Align the spark plug wire connector with the spark plug terminal.
- Push and Twist: Push the connector onto the spark plug terminal and twist it securely.
Step 7: Starting Your Bolens Lawn Mower
Now that the new spark plug is installed, start your Bolens lawnmower to ensure everything is functioning properly.
Testing the New Spark Plug:
- Engage the Ignition: Turn the ignition key to the ‘ON’ position.
- Start the Engine: Pull the starter cord or press the start button to ignite the engine.
- Observe Performance: Listen for any unusual noises or sputtering. Check if the engine runs smoothly.
Tips for Maintaining Your Spark Plugs
- Regular Replacements: Spark plugs are designed to last for a certain duration, typically around 25-30 hours of mowing time. Consult your owner’s manual for the specific recommendation for your Bolens model.
- Proper Storage: Store spare spark plugs in a cool, dry place to prevent corrosion or damage.
- Quality Spark Plugs: Opt for high-quality spark plugs from reputable manufacturers to ensure optimal performance and longevity.
Troubleshooting Common Problems
- Engine Won’t Start: If your Bolens lawnmower still won’t start after replacing the spark plug, check the fuel supply, air filter, and ignition system.
- Engine Runs Rough: If the engine runs roughly or sputters, inspect the spark plug gap, the air filter, and the fuel system.
- Spark Plug Gap Adjustment: If the engine runs poorly, consider adjusting the spark plug gap. Refer to your owner’s manual for the recommended gap for your model.
Conclusion
Changing spark plugs on a Bolens lawnmower is a simple task that can significantly improve your mower’s performance and longevity. By following these steps and implementing the troubleshooting tips, you can ensure your mower runs smoothly and efficiently. Remember to refer to your owner’s manual for specific instructions and recommendations for your Bolens model. With a little effort and these simple guidelines, you’ll be back to enjoying a well-maintained and powerful lawnmower.
Frequently Asked Questions
1. What tools do I need to change spark plugs on a Bolens lawnmower?
You will need a few basic tools to change spark plugs on your Bolens lawnmower. These include a socket wrench that fits the spark plug size (typically 5/8 inch), a gap gauge to check and adjust the spark plug gap, a wire brush to clean the spark plug threads, and a pair of gloves for protection. Additionally, you’ll need a new spark plug that matches the specifications for your lawnmower. It’s a good idea to consult your owner’s manual or check the old spark plug for the correct model and heat range.
Having these tools readily available will make the process much smoother and ensure you have everything you need to complete the task successfully. If you don’t have these tools, you can purchase them at most auto parts stores or online retailers.
2. How often should I change spark plugs on my Bolens lawnmower?
The frequency of spark plug replacement depends on several factors, including the age of your lawnmower, the type of spark plugs used, and your usage patterns. However, a general recommendation is to replace spark plugs every 100 hours of operation or annually, whichever comes first. If you notice a decrease in engine performance, misfires, or difficulty starting, it may be time to replace your spark plugs sooner.
Regular spark plug replacement ensures optimal engine performance, fuel efficiency, and longevity. It also helps prevent potential damage to your lawnmower’s engine due to worn-out or faulty spark plugs. By adhering to the recommended replacement schedule or paying attention to any signs of trouble, you can maintain a healthy and reliable engine.
3. How do I know which spark plug is the right one for my Bolens lawnmower?
The best way to determine the correct spark plug for your Bolens lawnmower is to consult your owner’s manual. It will provide detailed specifications, including the spark plug model and heat range, that are specifically designed for your mower. If you don’t have your owner’s manual, you can typically find this information on the spark plug itself or on a sticker attached to the engine.
You can also check with your local lawnmower dealer or an auto parts store, providing them with your Bolens model number. They can help you identify the correct spark plug for your mower. Ensure you choose a spark plug with the appropriate heat range for your operating conditions.
4. How do I adjust the spark plug gap?
Adjusting the spark plug gap is crucial for optimal engine performance. To do this, use a gap gauge to measure the gap between the spark plug electrodes. The recommended gap is typically specified in your owner’s manual or on the spark plug packaging. If the gap is too small or too large, adjust it using a spark plug gap tool.
To adjust the gap, carefully bend the side electrode closer or farther away from the center electrode until the desired gap is achieved. Ensure the gap is within the specified range for your lawnmower. It’s important to note that adjusting the gap too much can damage the spark plug.
5. What should I do if the spark plug is difficult to remove?
If you encounter resistance while removing the spark plug, it may be seized due to corrosion or carbon buildup. You can try using a penetrating oil or a spark plug removal tool to loosen it. Apply penetrating oil to the threads of the spark plug and let it sit for a few minutes before attempting to remove it again. If the spark plug is still stuck, use a spark plug removal tool designed to grip the plug and loosen it.
If you can’t remove the spark plug yourself, it’s best to consult a mechanic or lawnmower repair specialist to avoid damaging the spark plug or engine.
6. What should I do if my lawnmower won’t start after changing the spark plug?
If your Bolens lawnmower won’t start after changing the spark plug, there are a few things you can check. First, ensure you have connected the spark plug wire securely to the spark plug and the ignition coil. Next, verify that the spark plug is properly gapped. If the gap is incorrect, the spark plug won’t fire properly.
Also, check for any loose connections or broken wires in the ignition system. If everything appears to be connected correctly and the spark plug is gapped properly, there may be another issue with the engine, such as a faulty fuel system or a clogged air filter. You may need to troubleshoot further or consult a mechanic.
7. Can I reuse the old spark plug?
It’s generally not recommended to reuse old spark plugs. Once a spark plug has been used, the electrodes wear down, and the gap becomes wider. This can lead to a decrease in engine performance and can even damage the engine. Additionally, the porcelain insulator may crack or chip, which can cause misfires or short circuits.
Replacing spark plugs with new ones ensures optimal engine performance, fuel efficiency, and longevity. It’s a small investment that can save you a lot of trouble and ensure your lawnmower runs smoothly for years to come.