Is your Murray lawn mower sputtering, coughing, or refusing to start? It might be time to clean the carburetor. A dirty carburetor can cause a multitude of problems, from poor fuel flow to engine stalling. Fortunately, cleaning a carburetor is a relatively straightforward task that can be done by anyone with basic mechanical skills. This guide will walk you through the process, step-by-step, so you can get your Murray mower running smoothly again.
A Quick Overview of Carburetor Cleaning
The carburetor is the heart of your lawn mower’s engine, responsible for mixing air and fuel in the correct proportions. Over time, this critical component can become clogged with debris, varnish, and other contaminants, leading to engine problems. Cleaning the carburetor involves removing it from the mower, disassembling it, cleaning the internal parts, and reassembling everything. This process will restore the carburetor to its original condition, allowing your engine to run smoothly again.
Step 1: Gathering Your Supplies
Before you begin, gather the following tools and materials:
- A set of screwdrivers (Phillips and flathead)
- A carburetor cleaning kit (containing a spray cleaner, a small brush, and a bowl for soaking parts)
- A small container for collecting fuel
- A rag
- Protective gloves
- Safety glasses
- A workspace with adequate lighting
Step 2: Preparing Your Murray Lawn Mower
2.1 Disconnecting the Fuel Line
- Locate the fuel line. It’s a rubber hose that connects the fuel tank to the carburetor.
- Disconnect the fuel line. Gently pull the line off the carburetor fitting. You may need to use a pair of pliers to help you.
- Collect any fuel. Be sure to collect any fuel that spills out of the line in a safe container.
2.2 Disconnecting the Spark Plug Wire
- Locate the spark plug wire. It’s a wire that connects the spark plug to the ignition system.
- Disconnect the wire. Carefully pull the wire off the spark plug terminal.
2.3 Removing the Carburetor
- Locate the carburetor. It’s usually situated on top of the engine block.
- Identify the mounting bolts. These are typically located on the sides or bottom of the carburetor.
- Remove the bolts. Use your screwdrivers to loosen and remove the bolts.
- Gently remove the carburetor. Once the bolts are removed, carefully lift the carburetor off the engine.
Step 3: Disassembling the Carburetor
3.1 Removing the Float Bowl
- Locate the float bowl. This is a small metal chamber on the bottom of the carburetor.
- Identify the float bowl screws. They are typically located on the sides of the float bowl.
- Remove the screws. Use your screwdriver to loosen and remove the screws.
- Gently remove the float bowl. Once the screws are removed, carefully lift the float bowl off the carburetor.
3.2 Removing the Main Jet
- Locate the main jet. It’s a small brass or copper tube that protrudes from the bottom of the carburetor.
- Use a jet tool. Insert the jet tool into the main jet and turn it counterclockwise to unscrew it.
- Remove the jet. Carefully remove the jet from the carburetor.
3.3 Removing the Idle Jet
- Locate the idle jet. It’s typically located in a small hole on the side of the carburetor.
- Use a jet tool. Insert the jet tool into the idle jet and turn it counterclockwise to unscrew it.
- Remove the jet. Carefully remove the jet from the carburetor.
3.4 Inspecting the Float
- Locate the float. This is a small, hollow piece of metal attached to a rod.
- Inspect the float. Make sure the float is free of any cracks, holes, or other damage.
- Adjust the float level. If necessary, adjust the float level by bending the float arm.
Step 4: Cleaning the Carburetor Parts
4.1 Cleaning the Float Bowl
- Use carburetor cleaner. Spray the inside of the float bowl with carburetor cleaner and use a small brush to remove any debris.
- Rinse with water. Rinse the float bowl with clean water to remove any remaining cleaner.
- Dry thoroughly. Dry the float bowl with a clean rag.
4.2 Cleaning the Jets
- Use carburetor cleaner. Spray the jets with carburetor cleaner and use a small brush to remove any debris.
- Soak in cleaner. Soak the jets in a bowl of carburetor cleaner for a few minutes.
- Rinse with water. Rinse the jets with clean water to remove any remaining cleaner.
- Dry thoroughly. Dry the jets with a clean rag.
4.3 Cleaning the Carburetor Body
- Use carburetor cleaner. Spray the inside of the carburetor body with carburetor cleaner and use a small brush to remove any debris.
- Rinse with water. Rinse the carburetor body with clean water to remove any remaining cleaner.
- Dry thoroughly. Dry the carburetor body with a clean rag.
Step 5: Reassembling the Carburetor
5.1 Installing the Jets
- Install the main jet. Screw the main jet back into the carburetor, turning it clockwise until it is snug.
- Install the idle jet. Screw the idle jet back into the carburetor, turning it clockwise until it is snug.
5.2 Installing the Float Bowl
- Install the float bowl. Carefully place the float bowl back onto the carburetor and align the screws.
- Tighten the screws. Use your screwdriver to tighten the screws.
5.3 Reinstalling the Carburetor
- Align the carburetor. Carefully align the carburetor with the engine block.
- Tighten the mounting bolts. Use your screwdriver to tighten the mounting bolts.
Step 6: Connecting the Fuel Line and Spark Plug Wire
- Connect the fuel line. Gently push the fuel line back onto the carburetor fitting.
- Connect the spark plug wire. Carefully push the wire back onto the spark plug terminal.
Step 7: Starting Your Murray Lawn Mower
- Prime the carburetor. If your mower has a primer bulb, press it a few times to prime the carburetor with fuel.
- Start the mower. Turn the ignition key to the “on” position and pull the starter cord.
- Adjust the throttle. Once the mower starts, adjust the throttle to the desired speed.
Troubleshooting
If your Murray lawn mower is still not running properly after cleaning the carburetor, there may be other issues, such as:
- A clogged fuel filter. Check the fuel filter and replace it if necessary.
- A faulty spark plug. Check the spark plug and replace it if necessary.
- A damaged ignition coil. Check the ignition coil and replace it if necessary.
- A fuel pump problem. Check the fuel pump and replace it if necessary.
Tips for Maintaining Your Carburetor
- Use fresh fuel. Always use fresh fuel in your lawn mower. Old fuel can gum up the carburetor and cause problems.
- Add fuel stabilizer. Add fuel stabilizer to your fuel tank to help prevent fuel from going bad.
- Store your mower properly. When not in use, store your mower in a dry place and cover it with a tarp or sheet.
- Clean the air filter regularly. A clean air filter will help to prevent dirt and debris from getting into the carburetor.
Conclusion
Cleaning your Murray lawn mower carburetor is a simple but essential maintenance task that can help keep your mower running smoothly. By following the steps outlined in this guide, you can easily clean your carburetor and ensure your mower is ready to tackle any yard work. Remember to always exercise caution when working on your mower and wear protective gear. If you’re unsure about any part of the process, consult a qualified mechanic for assistance.
FAQ
What is a carburetor, and why should I clean it?
A carburetor is a vital component in your Murray lawn mower engine. It’s responsible for mixing air and fuel in the correct proportions to create a combustible mixture. Over time, this mixture can become clogged with debris and gum, causing your mower to run poorly. This leads to issues like stalling, difficulty starting, and inconsistent power output. Cleaning the carburetor removes these obstructions and restores optimal fuel flow, giving your mower the performance it needs.
When should I clean my Murray lawn mower carburetor?
The frequency of cleaning your carburetor depends on several factors, including the quality of fuel used, the age of your mower, and how often you use it. If you notice any of the issues mentioned above, it’s a good sign that your carburetor needs cleaning. You should also consider cleaning it at least once a year, especially if you use your mower regularly.
What tools and materials do I need to clean my carburetor?
You’ll need a few basic tools and materials to clean your carburetor. This includes a small screwdriver set for removing screws, a carburetor cleaner spray, a small bowl or container, clean rags, and a toothbrush or similar small brush. You might also want to have a pair of safety glasses and gloves for protection.
How do I remove the carburetor from my Murray lawn mower?
Removing the carburetor from your mower depends on the specific model you have. However, the process typically involves disconnecting the fuel lines, removing any screws securing the carburetor to the engine, and gently pulling it out. You should refer to your mower’s manual for specific instructions on removing the carburetor.
What happens if I use the wrong carburetor cleaner?
Using the wrong type of carburetor cleaner can damage your carburetor and engine. It’s crucial to use a cleaner specifically designed for carburetors, as these are formulated to dissolve the gum and varnish without harming the metal parts. Avoid using cleaners that contain harsh chemicals or solvents.
How do I know if my carburetor is clean enough?
After cleaning the carburetor, it’s important to ensure it’s free of any residue. Inspect all the internal parts for any remaining debris or gum. You should also check the jets and passages for any blockage. If everything is clean and unobstructed, your carburetor is ready to be reinstalled.
What should I do if I’m having trouble cleaning my carburetor?
If you encounter difficulties cleaning your carburetor or are unsure about any step, it’s best to seek professional help. A qualified mechanic can thoroughly clean your carburetor, ensuring optimal performance and preventing further damage. Remember, proper maintenance is key to keeping your Murray lawn mower running smoothly.