A sputtering, coughing lawn mower can be a real pain. Sometimes, a simple spark plug change can be the cure for your mowing woes. But before you head to the store, you need to know: what size spark plug does my Craftsman lawn mower need? This article will guide you through the process of finding the right spark plug for your specific Craftsman model, explain why the size matters, and provide tips for a smooth replacement.
In short, you’ll need to determine the specific spark plug model recommended by the manufacturer for your Craftsman lawn mower. This information is usually found in your owner’s manual or on a sticker located on the engine.
Where to Find Your Craftsman Lawn Mower’s Spark Plug Information
The first step is to locate the correct spark plug size for your specific Craftsman lawn mower. Here’s where you can find the information:
1. Your Owner’s Manual:
The owner’s manual is usually the best place to start. It contains detailed specifications and maintenance instructions for your mower, including the correct spark plug model.
2. Engine Sticker:
Look for a sticker attached to the engine. This sticker often includes the model number, engine specifications, and recommended spark plug information.
3. Online Resources:
If you don’t have your owner’s manual or can’t find the sticker, you can use online resources. Many websites provide parts diagrams and specifications for various Craftsman models. Websites like PartsTree.com and SearsPartsDirect.com are good starting points.
4. Craftsman Customer Service:
If you’re still struggling to find the information, contact Craftsman customer service directly. They can help you identify the correct spark plug for your model.
Understanding Spark Plug Specifications
Once you’ve found the spark plug model recommended for your Craftsman mower, it’s important to understand the different specifications that determine the right fit:
1. Reach:
The reach refers to the distance between the spark plug’s threads and the top of its insulator. This measurement ensures the spark plug sits at the correct depth in the cylinder head.
2. Thread Size:
The thread size refers to the diameter of the spark plug’s threads. It determines whether the plug will screw into the cylinder head properly.
3. Heat Range:
The heat range determines how well the spark plug dissipates heat. The wrong heat range can lead to overheating or fouling problems.
4. Electrode Gap:
The electrode gap is the space between the center electrode and the ground electrode. This gap impacts the spark’s intensity and efficiency.
Choosing the Right Spark Plug for Your Craftsman Mower
With the correct spark plug specifications in hand, you can select a compatible replacement. When purchasing a new spark plug, consider these key factors:
1. Brand:
While many brands offer quality spark plugs, some are known for their reliability and performance in lawn mower applications. Popular options include Champion, NGK, Autolite, and Bosch.
2. Type:
Spark plugs come in various types, such as copper core, platinum, iridium, and double platinum. Copper core plugs are typically affordable and provide decent performance, while platinum and iridium plugs offer longer lifespans and improved fuel efficiency.
3. Durability:
Consider the type of use your Craftsman mower experiences. For frequent or heavy use, a more durable platinum or iridium spark plug may be worthwhile.
Installing a New Spark Plug
Now that you’ve selected the right spark plug, it’s time for installation. This process is typically straightforward, but it’s essential to follow the correct steps:
1. Disconnecting the Spark Plug Wire:
Start by disconnecting the spark plug wire. Be careful not to pull on the wire; grab it near the connector to prevent damage.
2. Removing the Old Spark Plug:
Use a spark plug socket wrench to loosen the old spark plug. Turn it counterclockwise until it is removed.
3. Inspecting the Cylinder Head:
Before installing the new plug, inspect the cylinder head threads for any damage or debris. Clean any dirt or buildup.
4. Installing the New Spark Plug:
Screw the new spark plug into the cylinder head by hand until it’s snug. Use the wrench to tighten the spark plug to the manufacturer’s recommended torque specification. Over-tightening can damage the threads.
5. Reconnecting the Spark Plug Wire:
After securing the new spark plug, reconnect the spark plug wire. Make sure the wire is securely connected.
Tips for Long-Lasting Spark Plug Performance
To ensure your spark plug remains in optimal condition, follow these helpful tips:
1. Regular Maintenance:
Consult your owner’s manual for recommended spark plug replacement intervals. Typically, lawn mower spark plugs should be replaced every 100-200 hours of operation or annually, whichever comes first.
2. Clean Spark Plug:
If you notice performance issues, inspect your spark plug for fouling or excessive wear. Clean the spark plug with a wire brush and ensure the electrode gap is correct.
3. Fuel Quality:
Use high-quality gasoline to prevent fuel contamination and minimize spark plug fouling.
4. Proper Storage:
If you’re storing your Craftsman mower for an extended period, remove the spark plug and store it in a clean, dry location. This prevents corrosion and potential damage.
Conclusion
Knowing the correct spark plug size for your Craftsman lawn mower is essential for optimal engine performance and a smooth mowing experience. By following the steps outlined in this guide, you can confidently find, install, and maintain the right spark plug for your specific model. Remember to consult your owner’s manual for specific recommendations and always prioritize safety when working with your lawn mower. With a properly functioning spark plug, you’ll be able to tackle those overgrown lawns with ease!
FAQs
What size spark plug do I need for my Craftsman lawn mower?
The spark plug size for your Craftsman lawn mower depends on the model. The most common size is Champion RJ19LM, which is also compatible with other popular brands like Briggs & Stratton and Kohler. However, it’s best to check your owner’s manual for the specific size required for your model. You can also find this information on the spark plug itself or by searching for your lawn mower model number online.
Where can I find the spark plug size in my Craftsman lawn mower manual?
The spark plug size for your Craftsman lawn mower is usually listed in the “Maintenance” or “Specifications” section of your owner’s manual. You can usually find the owner’s manual online by searching for your model number or by contacting the Craftsman customer support team. If you don’t have the owner’s manual, you can also find the spark plug size information on the engine’s data tag, which is typically located on the engine’s side or top.
How do I know if my Craftsman lawn mower needs a new spark plug?
The spark plug in your Craftsman lawn mower can wear out over time, requiring replacement. Signs of a worn-out spark plug include difficulty starting the mower, inconsistent engine performance, or a black sooty exhaust. If you notice any of these symptoms, it’s a good idea to check the spark plug and replace it if necessary.
What type of spark plug should I use for my Craftsman lawn mower?
You should use a spark plug that’s specifically designed for lawn mowers. These spark plugs are typically made of durable materials and have a longer lifespan than standard automotive spark plugs. It’s also important to choose a spark plug with the correct heat range for your engine. The heat range is a measure of the spark plug’s ability to dissipate heat. A colder heat range is better for high-performance engines, while a hotter heat range is better for engines that run at lower temperatures.
How do I change the spark plug on my Craftsman lawn mower?
Changing the spark plug on your Craftsman lawn mower is a relatively simple process. First, disconnect the spark plug wire from the spark plug. Then, use a wrench to remove the spark plug from the cylinder head. Be sure to hold the spark plug with your hand to prevent it from falling into the cylinder. Install the new spark plug by hand, then tighten it with a wrench. Once the spark plug is installed, reconnect the spark plug wire.
Can I use any spark plug for my Craftsman lawn mower?
While some spark plugs may seem interchangeable, it’s crucial to use the correct type and size for your Craftsman lawn mower. Using the wrong spark plug can lead to engine problems and damage. Always refer to your owner’s manual or consult a professional mechanic for recommendations.
What should I do if I don’t know the spark plug size for my Craftsman lawn mower?
If you’re unsure about the spark plug size for your Craftsman lawn mower, you can find this information on the spark plug itself or by searching for your lawn mower model number online. You can also contact Craftsman customer support for assistance. They will be able to provide you with the correct spark plug size for your model.