Yes, you can do it in 15 minutes – learning how to change the spark plug on a Craftsman snowblower is a simple job that saves you money and gets your machine running right away.
I’ve changed dozens of these plugs over the years. It’s one of the first things I check when my snowblower won’t start on a cold morning.
A bad spark plug is a common reason for hard starting. The good news is that fixing it is cheap and easy.
This guide will walk you through every step. You don’t need to be a mechanic to get it done right.
Why You Need to Know How to Change the Spark Plug
Let’s talk about why this skill matters so much. A snowblower is useless if it won’t start.
The spark plug is a tiny part with a big job. It makes the spark that lights the fuel in the engine.
When it gets old or dirty, that spark gets weak. Your engine might not start at all.
Knowing how to change the spark plug on a Craftsman snowblower fixes this fast. You won’t be stuck waiting for a repair shop.
It’s also a great way to learn about your machine. You’ll feel more confident doing other small fixes too.
I always keep a spare plug in my garage. It’s cheap insurance for the next big snowstorm.
Tools You Need for the Job
You only need a few basic tools. You probably have most of them already.
The main tool is a spark plug socket. This is a special deep socket with a rubber insert inside.
The rubber holds the plug so it doesn’t fall out. A regular socket won’t work as well.
You’ll also need a ratchet and an extension bar. A 3-inch extension is perfect for reaching the plug.
Don’t forget the new spark plug itself. Check your owner’s manual for the right type and gap.
Some people use a gap tool to check the new plug. I like to do this to make sure it’s set right.
A clean rag is handy for wiping away dirt. You don’t want grit falling into the engine hole.
Step 1: Safety First – Disconnect the Spark Plug Wire
This is the most important step. Never skip it.
Find the rubber boot on the top of the old spark plug. It’s a thick black wire.
Grab the boot firmly and pull it straight off. Don’t yank on the wire itself.
Now move that wire away from the plug. I usually rest it on the engine block where it can’t touch anything.
This stops the engine from starting by accident. Even with the key off, there can be a small charge.
It takes two seconds and keeps your fingers safe. Always do this before you touch the plug.
The Occupational Safety and Health Administration (OSHA) says to always disconnect power before maintenance. This is the same idea.
Step 2: Remove the Old Spark Plug
Now you can take the old one out. Look at how it sits in the engine.
Put your spark plug socket onto the plug. Make sure it’s seated all the way down.
Attach your ratchet and extension to the socket. Turn it counter-clockwise to loosen it.
The first turn might be tight. Use steady pressure until it breaks free.
Once it’s loose, you can unscrew it by hand. Be careful not to tilt it too much.
Lift the old plug straight out of the hole. Look at the tip – is it black and oily? Is the electrode worn down?
This inspection tells you about your engine’s health. A clean, light tan color is what you want to see.
Step 3: Check and Gap the New Plug
Don’t just screw in the new one right away. You need to prepare it first.
Take the new spark plug out of its box. Look at the metal piece at the bottom.
There’s a small L-shaped electrode and a center electrode. The space between them is the gap.
Your owner’s manual will tell you the right gap size. For most Craftsman snowblowers, it’s 0.030 inches.
Use your gap tool to check it. Slide the correct thickness gauge between the electrodes.
If it’s too tight, gently bend the L-shaped electrode out. If it’s too wide, tap it gently on a hard surface to close it.
Getting this gap right is key for a strong spark. It’s worth the extra minute to check.
Step 4: Install the New Spark Plug
Now you’re ready to put the new one in. This part is easy if you’re careful.
Start by threading the plug into the hole by hand. Turn it clockwise.
If it doesn’t go in smoothly, don’t force it. Back it out and try again.
Cross-threading will ruin the engine head. Taking your time here saves big headaches.
Once it’s hand-tight, use your socket and ratchet. Give it another quarter to half turn.
You want it snug, but not super tight. Overtightening can crack the porcelain insulator.
That’s it – the new plug is in. The hard part of learning how to change the spark plug on a Craftsman snowblower is done.
Step 5: Reconnect the Wire and Test
You’re almost finished. Grab the spark plug wire you set aside earlier.
Push the rubber boot straight down onto the new plug. You should feel and hear a firm click.
Give the boot a gentle tug to make sure it’s on. It shouldn’t come off easily.
Now you can try to start the engine. Make sure the area around you is clear.
Turn the key or pull the starter cord. The engine should fire up more easily.
If it starts right away, great job. You just learned how to change the spark plug on a Craftsman snowblower successfully.
If it still doesn’t start, the plug might not be the only issue. But you’ve ruled out one big problem.
How Often Should You Change the Spark Plug?
This is a common question. I get asked about timing a lot.
For normal home use, change it once a season. Do it at the start of winter.
A fresh plug makes cold starts much easier. It’s cheap peace of mind.
If you use your snowblower a lot, check it mid-season too. Heavy use wears parts faster.
Look for signs of a bad plug before it fails completely. Hard starting is the main clue.
Rough running or loss of power can also point to plug issues. Don’t wait for a total failure.
Keeping a log helps. Write the date on the box of your new plug when you install it.
Choosing the Right Replacement Spark Plug
Not all spark plugs are the same. Using the wrong one can cause problems.
The best place to check is your owner’s manual. It lists the exact part number.
If you lost the manual, look up your model online. The Craftsman website has this info.
You can also take the old plug to the store. An auto parts store can match it for you.
Common types for Craftsman are Champion or NGK brands. Both work well if they’re the right model.
Don’t just buy the cheapest plug you see. A quality plug lasts longer and works better.
Spending a few extra dollars is worth it. Your snowblower is a big investment to protect.
Common Mistakes to Avoid
I’ve seen people make simple errors. Let’s go over them so you don’t.
First, never forget to disconnect the wire. I said it before, but it’s that important.
Second, don’t over-tighten the new plug. Snug is enough – you’re not trying to win a strength contest.
Third, avoid getting dirt in the spark plug hole. Clean the area around it first.
Fourth, don’t force the plug if it won’t thread. This is a sure sign you’re cross-threading it.
Fifth, remember to check the gap on the new plug. Factory gaps aren’t always perfect.
Following these tips makes the job smooth. Learning how to change the spark plug on a Craftsman snowblower is easy when you avoid these pitfalls.
What If It Still Doesn’t Start?
Sometimes a new plug doesn’t fix everything. That’s okay – engines can have other issues.
Check that you have fresh gas in the tank. Old gas goes bad and won’t ignite.
Make sure the fuel valve is turned on. I’ve forgotten this more than once myself.
Look at the spark plug wire for cracks or damage. A bad wire won’t deliver the spark.
The Consumer Reports guide to small engine care says to check these simple things first. They cause most starting problems.
If you still have trouble, the carburetor might need cleaning. That’s a job for another day.
But in most cases, a new plug does the trick. It’s the most common fix for a no-start engine.
Benefits of Doing It Yourself
Changing your own plug has big upsides. Let me tell you why I always do it myself.
First, you save a lot of money. A shop might charge $50 or more for this simple job.
Second, you save time. You can do it in 15 minutes instead of waiting days for an appointment.
Third, you learn about your machine. This knowledge helps you spot other issues early.
Fourth, you get the satisfaction of fixing it yourself. There’s a real pride in that.
Fifth, you’re ready for the next snowstorm. You won’t be stuck with a machine that won’t start.
Knowing how to change the spark plug on a Craftsman snowblower gives you control. You’re not dependent on someone else’s schedule.
Frequently Asked Questions
How often should I change the spark plug on my snowblower?
Change it once a year, at the start of the season. If you use it a lot, check it halfway through winter too. A fresh plug makes starting much easier.
What size socket do I need to change the spark plug?
Most Craftsman snowblowers use a 5/8 inch spark plug socket. Some older models might use 13/16 inch. Check your old plug or manual to be sure.
Can I use any spark plug brand?
No, you should use the type listed in your owner’s manual. Different engines need different heat ranges. Using the wrong plug can cause engine damage.
Do I need to gap a new spark plug?
Yes, you should always check the gap. Plugs come pre-gapped from the factory, but they can get bumped in shipping. It only takes a minute to verify.
Why won’t my snowblower start even with a new plug?
Check for old gas, a clogged fuel line, or a closed fuel valve. The American Society of Agricultural and Biological Engineers (ASABE) notes bad fuel is a top cause of small engine failure.
Is it safe for me to change the spark plug myself?
Yes,
