Most new generator owners don’t realize they’ve purchased a mechanical device; they often think it’s just an electronic device that generates electricity. When their generator stops working, they typically call a mechanic.
As a Fixer, we ask them when they last changed the engine oil. Many respond that they haven’t changed it, which can lead to damage to the internal parts of the engine. When the oil sensor detects low oil levels, it triggers the generator to shut off automatically.
But don’t worry! Generator Fixer is here to explain how to change generator oil in eight simple steps, complete with images or videos.
How To Change Generator Oil in (8-Steps) Guide
Tools and Materials Needed (List)
Safety should always be a top priority when changing oil. First, wear protective gloves, and start the generator for a few minutes to warm up the old engine oil before starting this procedure.
Step 1: Warm Up the Existing Oil
When engine oil gets cold and old, it becomes thick and sticky. As a result, some deposits in the oil tend to sink to the bottom of the engine.
To start the oil-changing process, warm up the existing oil in the generator’s engine. This will make drainage smoother, as hot oil flows more easily.
First, start the generator and let it run for 10 to 15 minutes to allow the old oil to reach maximum temperature. Once it’s warmed up, turn off the generator and move on to the second step.
Step 2: Lift the Generator on Blocks
Stabilize the working environment by placing identical blocks on a level surface. The reason for putting it on the blocks is to have some extra space, making it easier to reach the oil drain plug and move around while working.
If the generator is large or heavy weight, such as a quiet diesel or stationary generator, it’s not easy to move. So, you might need to bend down a bit for the oil replacement.
Step 3: Disconnect the Spark Plug Wire
With the generator securely placed on stable blocks, locate the spark plug boot and remove it to prevent accidental auto engine starts while working without oil.
If you have difficulty locating the spark plug, refer to your owner’s manual. Alternatively, refer to the picture above for guidance on its location.
Step 4: Ready for Draining Used Oil
Now locate the oil drain plug or tube on the bottom of the engine, typically a 3/8″ nut with a square or hexagonal head.
Refer to the owner’s manual for specific details on your generator drain plug or tube location. Otherwise, see on picture here provided for reference to a specific model, maybe your gen model is different please understand.
After finding the drain plug location, clean the area around the drain plug using a paper towel to verify a clear view. Next, place an oil pan or a leak-proof container under the drain plug to catch every drop of the old oil.
Step 5: Loosen and Remove the Oil Drain Plug
With the drain pan in position, use a ratchet and a 3/8″ socket, or refer to the user manual for the correct socket size, to loosen the oil drain plug.
Once loosened, remove the ratchet and socket, unscrewing the rest of the threading manually. Carefully remove the drain plug to allow the used oil to drain completely, collecting every drop in the pan to prevent environmental contamination.
Step 6: Reinsert the Drain Plug and Add Fresh Oil
After collecting the old oil, reinstall the oil drain plug or tube manually, then tighten it with a socket wrench, being careful not to overtighten.
Then remove the oil fill cap, insert a funnel, and pour in the recommended amount of new oil. Use a dipstick to check the oil level, making sure not to overfill. Finally, reinstall the oil fill cap.
The oil capacity of a generator depends on its brand and model. with amounts typically ranging from 1.1 to 1.9 quarts. Refer to the owner’s manual for specific details on oil type and volume.
However, it’s advised by most generator manufacturers to use high-quality detergent oil specifically built for portable engines.
Commonly used oils for traditional generators include SAE 10W-30, which is suitable for most types of generators and commonly used in small engines.
Step 7: Replace the Oil Filter or Air Filter
If your generator does not include an oil filter, skip this step or jump to replace or clean the air filter. Every stationary generator and some portable traditional generators will include an oil filter.
Oil Filter
Replace the old oil filter with a new one. Use a high-quality oil filter and use a wrench to loosen and remove the old filter. Be sure to wear protective gloves due to the potential heat of the oil filter.
Clean the oil filter adapter, lubricate the rubber gasket of the new filter, and securely install it to prevent leaks and maintain engine health.
Air Filter
If your generator uses an air filter, which is common for open-frame generators and portable inverters like Duromax, Firman, Champion, Generac, Honda, Yamaha, etc., replace it with a new one. If you do not have a new air filter, follow this guide to clean the existing one.
Step 8: Reconnect the Spark Plug Wire
After completing the process, reconnect the spark plug wire boot. Slide the wire boot over the plug and press it in until it is fully secured. Listen for a click to ensure a proper connection.
Now, start the generator and let it run for a few minutes to distribute the clean oil and lubricate the engine. After a couple of minutes, stop the generator, check the oil level, and add more if necessary.
Finally, it’s your responsibility to dispose of used engine oil and oil filters properly. Local auto parts stores or service stations often provide disposal services.
To find the nearest recycling center, you can visit this website. Before going, it’s a good idea to call ahead and inquire whether they accept both used motor oil and oil filters.
How Often to Change Generator Oil?
The frequency with which you should change the oil in a generator depends on several factors, including the type of generator, its usage, and the manufacturer’s recommendations.
New Generators
When you buy a new generator, according to Generator Fixer, It’s often recommended to change the engine oil for the first time after 15 to 30 hours of operation. This initial oil change helps remove any contaminants that may have been present during the empty engine break-in period.
Regular Use
For generators that are used regularly, the oil should be changed approximately every 50 to 100 hours of operation. This time can pass quickly, especially if your unit is consistently running during a power outage. That’s why we suggest adding oil whenever you refuel and performing a complete oil change every 100 hours of use.
This is a common recommendation, but it’s crucial to check the owner’s manual for your specific generator model, as recommendations can vary.
Infrequent Use
If your generator is used infrequently or is used for standby purposes, it’s still essential to change the oil for some time. Even if the generator hasn’t been used much, oil can degrade over time due to factors like temperature fluctuations and moisture.
Synthetic vs. Conventional Oil
Some generators use synthetic oil, which generally has a longer lifespan than conventional oil. If your generator uses synthetic oil, you may be able to extend the oil change interval, but it’s essential to follow the manufacturer’s recommendations.
Video Guide
If you have any problems or difficulty with this oil-changing process at certain points, then you can watch this video.
Conclusion
I hope you feel confident in your ability to change the oil in your generator, as this is a valuable skill for generator owners. It is highly recommended to monitor the oil level of your generator closely. When you are ignoring oil change or allowing the oil level to decrease, it can lead to potential issues.
If you face any issues during the process, feel free to contact the Generator Fixer team for assistance.
FAQs
What Happens If You Don’t Change Generator Oil?
After a while, the oil can get dirty with stuff like dirt and leftovers from burning fuel. This makes the oil not work well. It can cause the generator engine to have issues like less lubrication, more friction, and higher temperatures. This might harm the engine’s internal parts.
Do You Need to Change Oil Filter After Every Oil Change?
You don’t have to change the oil filter every time you change the oil, but it’s a smart thing to do. The oil filter helps keep the engine oil free from big dirt, and changing it when you change the oil ensures everything works well.
Can I Change the Generator Oil Myself, or Should I Hire a Professional?
Changing the oil yourself is possible with the right tools and knowledge. However, if you are not confident, consulting a professional is recommended.
