How to Change Oil in a Generator

There’s more to generator maintenance than letting the machine run for a half hour each week. It’s also important to change the oil regularly. Not only does this maximize performance, but it increases efficiency too. This guide will teach you how to change your generator oil in 10 easy steps. Let’s get started.

Step 1 – Gather Your Tools

Before you learn how to change oil, you’ll need to gather a few tools. This ensures you follow the oil change steps safely.

• Owner’s manual – The owner’s manual tells you how often to change your generator oil, what grade of oil to use, and how much to pour. You’ll also learn where to locate different parts of the generator.
• Protective goggles – Goggles shield the eyes from oil splashes.

• Protective gloves – When handling hot greasy parts, you need a good pair of protective gloves. Opt for gloves with nitrile-coated palms and fingers to keep hands safe.

• Sturdy work surface – You’ll need a stable workspace while working on the generator. Depending on the size, you may opt for a worktable or the ground. Although a worktable lets you work comfortably without bending, the generator may weigh too much to lift.
• Blocks – Cement blocks allow you to raise the generator high enough to remove the drain plug and drain the oil.
• Fresh oil – The moving parts of a generator create a lot of friction and heat. Without oil, the engine can lock up. Fresh oil keeps the engine cool, clean, and lubricated.
• New filter – An oil filter removes contaminants. Over time, it can accumulate gunk, clog the system, and seize the engine. Some filters have an arrow indicating which direction to install them for the best oil flow. Review the owner’s manual for the filter recommendations.
• Oil pan – An oil pan or container allows the liquid to drain in one place without making a mess.

• Oil funnel – This tool has a wide mouth and a narrow neck, allowing you to pour fresh oil into the spout without spillage.

• Cleaning tools – Use a clean brush and cloth to clear away oil and grime.
• Oil filter wrench – Because oil filters can become greasy, they may be difficult to remove. Some people use a standard wrench. Others prefer to use their hands. But for the best grip, an oil filter wrench gets the job done.

• Ratchet and socket set – A ratchet and socket set allows you to remove fasteners quickly.

• Screwdriver set – You may need a Phillips or flathead to remove the cover that seals the oil port.

Step 2 – Warm the Old Oil

Start the generator and let it run for two to five minutes. Warm oil drains easier.

Step 3 – Prepare to Drain the Oil

Clear a sturdy work surface. Arrange large blocks on your workspace, leaving space underneath for an oil pan. Make sure the blocks are level before putting the generator on top. If the machine is weighty, get someone to help you lift it into position. You don’t want to strain your back trying to raise a heavy generator by yourself.

Step 4 – Disconnect the Spark Plug

With the generator on a stable surface, find the spark plug. If you’re having trouble locating the spark plug, consult your owner’s manual. First, remove the spark plug boot. Depending on the manufacturer, you may need a socket wrench. On some models, you can disconnect the spark plug with a simultaneous twist and pull motion. Be careful not to yank them apart. Doing so may cause damage. To prevent the engine from starting accidentally, separate the wire and spark plug.

Step 5 – Locate and Clean the Oil Drain Plug

Most generators have a 3/8-inch nut securing the drain plug. It may have a hexagon or square head. Again, you may need to review the manual to find the location. Once found, use a brush to remove the grime and a cloth to wipe away any oily residue.

Step 6 – Remove the Oil Plug

Grab a ratchet and a socket (the size will vary per manufacturer). With the drain pan in place, use the tools to unscrew the oil drain plug. Finish unfastening it with your hand. As soon as you pull the plug from its position, the old oil will flow out of the generator. Don’t forget the oil is full of contaminants and needs to be recycled.

Step 7 – Change the Oil Filter

If your generator comes equipped with an oil filter, prepare to change it when you change the oil. You don’t want to run fresh oil through an old filter. Not only will this extend the life of your generator, but it also keeps the engine in good working order. With protective gloves on, use a wrench to untighten the filter and complete the process using your hands. Inspect the adapter. If necessary, wipe away any crud. Next, smear a little oil on the gasket for lubrication. Then, screw the filter back in place. If necessary, use a pair of pliers or a wrench to tighten. Generally, it only takes a half or three-quarters turn. Do not overtighten, as this will damage the filter. Put the old filter in a safe place with the old motor oil until you can take them to a local recycling center.

Step 8 – Tighten the Plug

With the new filter installed, return the drain plug to its position. Start with a manual turn. Then, use a socket wrench to tighten the plug.

Step 9 – Pour New Oil

With the oil fill cap removed, insert a funnel and pour the new oil into the generator. Use the dipstick to verify the oil level. If you consulted the owner’s manual mentioned in Step 1, you should know what type of oil to use and how much is required. After you pour the oil, remove the funnel and close the cap.

Step 10 – Reconnect the Spark Plug

Set the spark plug into its housing and secure it with a socket wrench. Then, grab the spark plug boot and slide it over the plug. That’s it. Restart the generator and let it run for a few minutes, allowing the clean oil to circulate and lubricate the engine. Next, cut off the machine. Then check the oil level again. If it is not within the required range, add more oil. Let it run again for a couple of minutes.

Generator Oil Changing Tips

Your generator’s engine must stay lubricated to run smoothly. Here are a few tips to help your generator operate more efficiently.

1. Some manufacturers ship generators with the oil already installed. Check the level after opening the box, and add oil if necessary.
2. When in doubt, refer to the owner’s manual for oil type and fill amount. If you have misplaced your manual, check out the manufacturer’s website.
3. Change your oil filter each time you change the oil in your generator.
4. Be prepared for power outages, and keep extra oil and filters on hand.
5. Dusty areas tend to contaminate oil quickly. If running a generator in a dusty area, consider changing the oil more often.

Generator Oil Changing FAQs

The following information offers a general overview of frequently asked questions. Remember to review the owner’s manual for your specific brand. Not only will you find important details about your generator, but you can also explore troubleshooting tips.