Is your Craftsman snowblower sputtering, failing to start, or running rough? Don't let a faulty ignition coil leave you stranded in a snowstorm. This essential component is the spark that ignites your engine, and when it fails, your snowblower becomes little more than a heavy ornament. Fortunately, replacing an ignition coil is a manageable DIY task for most homeowners, saving you time and money on professional repairs.
This article will guide you through the entire process of diagnosing and replacing the ignition coil on your Craftsman snowblower. We'll cover everything from identifying the signs of a failing coil to safely removing the old one and installing a new one. By the end of this guide, you'll have the knowledge and confidence to get your snowblower back in working order and prepared for whatever winter throws your way.
Understanding the Ignition Coil's Role
The ignition coil is a crucial part of your snowblower's internal combustion engine. Its primary function is to transform the low voltage from the battery or magneto into a high voltage pulse. This high voltage is then delivered to the spark plug, creating the spark necessary to ignite the fuel-air mixture in the combustion chamber. Without a properly functioning ignition coil, the spark plug will not receive the necessary electrical charge, and the engine will not start or will run erratically.
Think of the ignition coil as a miniature transformer. It contains two sets of windings: a primary winding with fewer turns of thicker wire and a secondary winding with many more turns of thinner wire. When the engine's electrical system sends a current to the primary winding, it creates a magnetic field. As this current is suddenly interrupted, the magnetic field collapses, inducing a very high voltage in the secondary winding. This high voltage is then channeled through a spark plug wire to the spark plug.
The reliability of your snowblower's ignition system hinges on the health of the ignition coil. Factors like heat, vibration, and age can lead to wear and tear, causing the coil to degrade. Recognizing the symptoms of a failing coil is the first step toward a successful repair and ensuring your snowblower is ready when you need it most.
Symptoms of a Failing Ignition Coil
Several telltale signs can indicate that your Craftsman snowblower's ignition coil is on its way out. The most common symptom is a complete failure to start. You might crank the engine repeatedly, but nothing happens – no sputtering, no hint of ignition. This is often because the coil is no longer producing the high voltage needed to create a spark.
Another common indicator is an engine that starts but runs very poorly. This can manifest as misfiring, sputtering, or a significant loss of power. The engine might also stall unexpectedly, especially under load. If your snowblower starts but then dies after a short period, or if it runs rough and unevenly, the ignition coil is a prime suspect. You might also notice a lack of spark when you test the spark plug, which is a definitive sign of an ignition system problem.
Occasionally, a failing ignition coil can also cause backfiring or a noticeable reduction in fuel efficiency. If you've ruled out other common issues like a clogged fuel filter or a dirty carburetor, and your snowblower is exhibiting these symptoms, it's highly probable that the ignition coil needs to be replaced.
Tools and Materials Needed for Replacement
Before you begin the replacement process, gather all the necessary tools and materials to ensure a smooth and efficient repair. You will typically need a socket set with various sizes, including one that fits the bolts holding the ignition coil in place. A ratchet wrench will make these bolts easier to remove and install. A spark plug wrench is essential for removing the old spark plug and installing the new one.
You will also need a new ignition coil specifically designed for your Craftsman snowblower model. It's crucial to purchase the correct part to ensure compatibility and proper function. Refer to your snowblower's owner's manual or consult a parts diagram online to find the exact part number. A set of screwdrivers, both Phillips and flathead, might be necessary for removing shrouds or other engine components that obstruct access to the coil.
Additionally, it's a good idea to have a wire brush or sandpaper on hand to clean any corrosion from electrical terminals. A clean rag for wiping down surfaces and a small container for holding removed bolts and parts will also be helpful. Safety glasses are paramount to protect your eyes from debris, and work gloves can provide a better grip and protect your hands.
Step-by-Step Ignition Coil Replacement
Begin by ensuring your snowblower is completely cool and disconnected from any power source, including the spark plug wire. Locate the ignition coil, which is typically mounted near the flywheel on the engine block. You may need to remove engine shrouds or covers to gain access. Carefully disconnect the spark plug wire from the spark plug.
Next, identify the bolts securing the ignition coil to the engine. These bolts often hold the coil in close proximity to the flywheel. Carefully remove these bolts using your socket set and ratchet. Once the bolts are removed, gently pull the ignition coil away from the flywheel. Be mindful of the small gap between the coil and the flywheel; this gap is critical for proper spark generation.
With the old coil removed, clean the mounting surface on the engine block. Install the new ignition coil, ensuring it is positioned correctly. The mounting holes should align with the threaded holes on the engine. Reinstall the securing bolts and tighten them firmly, but avoid overtightening. Crucially, set the correct gap between the ignition coil and the flywheel. This gap is usually specified in your snowblower's manual, often around 0.010 inches. You can use a feeler gauge to measure this gap accurately. Finally, reconnect the spark plug wire to the new coil.
Testing and Troubleshooting
After installing the new ignition coil, it's time to test your work. Reattach any engine shrouds or covers that you removed. Ensure the spark plug wire is securely connected to the spark plug. Before attempting to start the engine, it's a good practice to perform a spark test. Remove the spark plug from the engine, reconnect the spark plug wire to it, and then hold the metal body of the spark plug firmly against a clean, unpainted metal part of the engine block. Have someone carefully pull the starter rope or turn the engine over. You should see a strong, blue spark jump across the spark plug gap.
If you see a good spark, reinsert the spark plug into the engine and tighten it appropriately. Now, attempt to start the snowblower. It should start more readily and run smoother than before. If the engine still fails to start or runs poorly, double-check all connections, especially the spark plug wire and the electrical connections to the ignition coil. Ensure the gap between the coil and the flywheel is still set correctly, as vibrations can sometimes cause it to shift.
If problems persist, re-examine the new ignition coil for any defects. It's also wise to check the spark plug itself; a fouled or worn spark plug can mimic ignition coil issues. If you've confirmed a good spark and the engine still won't run correctly, the problem might lie elsewhere in the fuel system or engine mechanics, requiring further diagnosis.
Key Takeaways
- ✓ A failing ignition coil is a common cause of snowblower starting problems and rough running.
- ✓ Symptoms include complete failure to start, misfiring, stalling, and loss of power.
- ✓ Essential tools include a socket set, ratchet, spark plug wrench, and a new, model-specific ignition coil.
- ✓ Proper gap setting between the ignition coil and flywheel is critical for optimal performance.
- ✓ Always perform a spark test after installation and before attempting to start the engine.
Frequently Asked Questions
How do I know if my Craftsman snowblower ignition coil is bad?
Common signs include the engine not starting at all, sputtering or misfiring, stalling unexpectedly, and a noticeable lack of power. If you've checked the fuel and air filters and the carburetor seems clean, the ignition coil is a likely culprit. A spark test can confirm this; if there's no spark at the plug, the coil is probably faulty.
Can I use an ignition coil from a different brand of snowblower?
It is strongly recommended to use an ignition coil specifically designed for your Craftsman snowblower model. While some coils might appear similar, they can have different electrical characteristics, mounting configurations, and gap requirements. Using an incompatible coil can lead to poor performance, engine damage, or complete failure to operate. Always consult your owner's manual or a parts supplier for the correct part number.
What is the correct gap for the ignition coil on a Craftsman snowblower?
The correct gap between the ignition coil and the flywheel is crucial for generating a strong spark. This gap is typically very small, often around 0.010 inches (approximately 0.25 mm). However, this can vary slightly depending on the specific snowblower model. Always refer to your Craftsman snowblower's service manual or the specifications provided by the ignition coil manufacturer for the precise gap setting. A feeler gauge is the best tool for accurate measurement.
How long does it typically take to replace an ignition coil on a snowblower?
For someone with basic mechanical experience, replacing an ignition coil on a Craftsman snowblower usually takes between 30 minutes to an hour. This timeframe includes gathering tools, removing any necessary covers, disconnecting the old coil, installing the new one, setting the gap, and performing a spark test. If you encounter unexpected difficulties or are unfamiliar with the process, it might take longer.
What should I do if the snowblower still doesn't start after replacing the ignition coil?
If the engine still won't start after a successful spark test and coil replacement, the issue might lie elsewhere. First, reconfirm the spark test and ensure the spark plug wire is securely attached. Check that the spark plug is properly gapped and not fouled. Then, investigate the fuel system: ensure you have fresh fuel, the fuel line isn't blocked, and the carburetor is clean and functioning correctly. If these checks don't resolve the problem, it may indicate a more complex engine issue requiring professional diagnosis.
Conclusion
Replacing a faulty ignition coil on your Craftsman snowblower is a practical and cost-effective repair that can restore your machine's power and reliability. By understanding the role of the ignition coil, recognizing the symptoms of failure, and following the step-by-step replacement guide, you can confidently tackle this task. Remember the importance of using the correct parts, setting the proper gap, and performing thorough testing to ensure a successful outcome.
Don't let a dead ignition coil leave you in the cold. With the knowledge gained from this guide, you are well-equipped to perform this essential maintenance. Get your tools ready, follow the instructions carefully, and soon your Craftsman snowblower will be ready to clear your driveways and walkways with ease, keeping you prepared for any winter weather.
