How to Change Oil on Craftsman M140 Lawn Mower: Step-by-Step Guide for Maintenance and Performance

Have you ever noticed your Craftsman M140 lawn mower struggling to perform? Just like any machine, it needs regular maintenance to keep running smoothly, and changing the oil is one of the simplest yet most effective ways to ensure its longevity.

Key Takeaways

• Regular Maintenance is Crucial: Changing the oil is essential for the performance and longevity of your Craftsman M140 lawn mower, ensuring it runs smoothly.
• Necessary Tools: Gather essential tools such as a socket wrench, oil filter wrench, funnel, oil drain pan, and gloves before starting the oil change.
• Choose the Right Oil: Use the appropriate oil type based on weather conditions—SAE 30 for warmer temperatures, 10W-30 for cooler climates, or synthetic oil for better engine protection.
• Follow Safety Precautions: Always ensure the engine is cool, wear gloves and safety glasses, and disconnect the spark plug to prevent accidental starts during maintenance.
• Change Frequency: Replace the oil every 50 hours of operation or at least once per season; more frequent changes may be necessary in dusty conditions.
• Proper Storage Practices: Store your mower in a cool, dry area, clean it before storage, and consider adding a fuel stabilizer if storing with fuel to prevent degradation.

Tools And Materials Needed

Gathering the right tools and materials simplifies the oil-changing process on your Craftsman M140 lawn mower. Here’s what you need to get started:

Essential Tools

• Socket Wrench: Use a socket wrench to loosen and remove the oil drain plug.
• Oil Filter Wrench: An oil filter wrench helps you remove the old oil filter if applicable.
• Funnel: A funnel ensures you pour oil neatly into the mower without spills.
• Oil Drain Pan: Place an oil drain pan underneath the mower to catch old oil.
• Gloves: Wear gloves to protect your hands from oil and grime.

• SAE 30 Oil: This oil type is suitable for warmer temperatures and general mowing conditions.
• 10W-30 Oil: Opt for 10W-30 oil in cooler weather for better engine performance.
• Synthetic Oil: Synthetic oil provides better lubrication and protection for your mower’s engine.

Using the right tools and oil type makes changing the oil efficient and straightforward.

Preparing The Mower

Preparing your Craftsman M140 lawn mower for an oil change ensures a smooth and efficient process. Follow these steps to get started.

Safety Precautions

Safety comes first. Always wear gloves and safety glasses during the oil change. Turn off the mower and allow the engine to cool completely. Disconnect the spark plug wire to prevent accidental starts. This step ensures you stay safe while working.

Location Setup

Choose a flat, well-ventilated area for the oil change. Place an oil drain pan under the mower to catch the old oil. Ensuring proper drainage prevents spills and makes cleanup easier. Having all your tools ready, like a socket wrench and funnel, will streamline the process. If possible, use a tarp or absorbent materials to protect the ground beneath the mower from any oil drips.

Step-By-Step Guide

Changing the oil in your Craftsman M140 lawn mower is straightforward. Follow these steps to ensure a successful oil change.

Draining The Old Oil

1. Prepare the Mower: Position the mower on a flat surface. Ensure the engine has cooled for at least 30 minutes.
2. Locate the Drain Plug: Find the drain plug beneath the mower. It’s usually near the base of the engine.
3. Remove the Drain Plug: Use a socket wrench to loosen and remove the drain plug. Allow old oil to flow into the drain pan.
4. Let It Drain Completely: Wait until all the oil has drained. This may take several minutes.
5. Reattach the Drain Plug: Once drained, clean the drain plug and reinsert it tightly to avoid leaks.

Replacing The Oil Filter

1. Locate the Oil Filter: Find the oil filter, typically mounted on the side of the engine.
2. Remove the Old Oil Filter: Use an oil filter wrench to carefully twist and remove the old filter. Be cautious, as it may still contain some oil.
3. Prepare the New Filter: Before installing the new filter, apply a thin layer of new oil to the rubber gasket on top of the filter. This ensures a better seal.
4. Install the New Oil Filter: Screw the new filter in place by hand. Don’t overtighten; just make it snug.

1. Select the Right Oil: Based on seasonal conditions, use either SAE 30, 10W-30, or synthetic oil.
2. Locate the Oil Fill Cap: Find the oil fill cap, usually on the top of the engine.
3. Pour in New Oil: Place a funnel in the oil fill opening. Slowly pour the new oil in, checking the dipstick level as you go.
4. Check the Oil Level: After adding oil, wait a moment, then remove the dipstick. Wipe it clean, reinsert it, and remove it again to check the level. Aim for the full mark.
5. Secure Everything: Replace the oil fill cap and ensure all components are tightened properly.

Following these steps helps maintain your mower’s performance and extends its lifespan. Regular oil changes keep your mower running smoothly.

Maintenance Tips

Regular maintenance ensures your Craftsman M140 lawn mower runs efficiently and serves you well. Follow these tips for optimal performance.

Frequency Of Oil Changes

Change the oil every 50 hours of operation, or at least once per season, whichever comes first. Frequent oil changes keep the engine lubricated and free from contaminants. If you use your mower in dusty conditions or tackle tall grass, check the oil more often. Always refer to your owner’s manual for specific recommendations.

Storing Your Mower

Store your mower in a cool, dry place to prevent rust and other damage. Before storing, clean the mower thoroughly by removing grass clippings and dirt. Use a soft brush or cloth for accessible areas. Ensure the fuel tank is empty or add a fuel stabilizer to prevent degradation if you plan to store it with fuel. Also, remove the spark plug and apply a bit of oil to maintain internal parts. Cover the mower with a tarp or dedicated cover to protect it from dust and moisture during the off-season.

Conclusion

Changing the oil in your Craftsman M140 lawn mower might seem like a small task but it makes a big difference in performance and longevity. By following the steps outlined and keeping up with regular maintenance you’ll ensure your mower runs smoothly season after season.

Remember to choose the right oil for the conditions and always prioritize safety during the process. A little effort now can save you time and money down the road.

So gather your tools get started and enjoy a well-maintained mower that keeps your lawn looking its best!

Frequently Asked Questions

How often should I change the oil in my Craftsman M140 lawn mower?

It’s recommended to change the oil every 50 hours of operation or at least once per season. Check the oil more frequently if mowing in dusty conditions or dealing with tall grass.

What tools do I need to change the oil in a Craftsman M140?

You’ll need a socket wrench, oil filter wrench, funnel, oil drain pan, and gloves. These tools will help streamline the oil-changing process efficiently.

What type of oil should I use for my Craftsman M140?

Use SAE 30 oil for warmer temperatures, 10W-30 for cooler weather, and consider synthetic oil for optimal lubrication and protection.

What safety precautions should I take before changing the oil?

Ensure the mower is off and has cooled down. Wear gloves and safety glasses, disconnect the spark plug wire to prevent accidental starts, and work in a well-ventilated area.

How do I prepare my mower for an oil change?

Choose a flat surface and place an oil drain pan underneath the mower. Gather all your tools and make sure to protect the ground from possible spills.