How to maintain an engine-genset ？
Learning how to maintain an engine-genset involves regular checks on fuel, oil, battery, and filters, and this guide by BISON covers the process.
- BY BISON
Table of Contents
Failure to maintain the gensets can result in engine failure to start, fuel leaks, dead batteries, or loss of usable output are typical problems with engine-gensets that are not adequately maintained. Low coolant levels are another common culprit—when coolant runs low, the engine can overheat under load, triggering automatic shutdowns or, in worse cases, warped cylinder heads.
Learning how to maintain an engine-genset involves regular checks on fuel, oil, battery, and filters, and this guide by BISON covers the process. It contains everything you need to know about maintaining an engine-genset.
Typical engine-gensets problems
Will the engine-genset get wet? Water and electricity are dangerous for people and animals. So understanding this danger is critical.
So what happens when it’s exposed to things like rain and snow?
Here are some sound suggestions for avoiding operating engine-gensets during storms, heavy rain or snow. If you do this, you may be at risk of electric shock.
Provide a cover for the engine-genset whenever possible—ideally a canopy structure over the top. But be aware that an awning doesn’t completely keep out the rain, and the tarp must still allow adequate airflow and ventilation.
If your engine-genset gets wet, dry it immediately with a hot hair dryer or by placing it in direct sunlight to prevent damage. Hopefully, only the spark plugs need to be checked, but water in the carburetor can lead to mechanical repairs.
Beyond covering the unit, choose a placement on elevated, well-drained ground away from flood-prone or salt-exposed areas, with enough open space around it for proper ventilation and exhaust flow, easy access for routine maintenance checks, and enough distance from windows or living areas to keep noise manageable.
How to maintain an engine-genset
So first, think about how you treat the diesel gensets. Do not leave a genset in the driveway for long periods and expect it to start after six months of neglect. Most condos do not allow gensets storage. If neglected, the gensets can become dead over time, and the only way to move it is with a trailer. It’s the simple engine concept; it has to run to keep running.
Ensure the power switch is in the “OFF” position and disconnect the spark plug wires before working on the engine to prevent accidental starting.
Before starting any maintenance task, gather a socket wrench for removing spark plugs and battery terminals, a multimeter for checking battery voltage and electrical connections, an oil pan or funnel for draining and adding oil cleanly, and a screwdriver set for accessing panels and tightening fasteners.
Clean engine-genset
Like anything you’re proud of, you want to keep it clean. Wipe the exterior surface clean with a damp cloth. Do not allow dust to accumulate on the engine or generator. Check the cooling air slots and openings to ensure they are clean and unobstructed. Do not wash with a garden hose or pressure washer, which may damage electrical components. For more detailed steps, please refer to “How to clean a diesel genset“.
Oil change
Oil change intervals vary depending on the age of the vehicle, its use, or storage. When changing the oil, run the engine-genset for a few minutes to warm it up and make cleaning easier. Then stop the engine-genset and wait for the engine to cool down to the touch. Unscrew the drain plug and collect the oil. Motor oil must be disposed of properly at a recycling centre. Replace the drain plug on a level surface, then refill the crankcase with the manufacturer-specified oil grade to the entire line. Most engine-gensets require an oil change within the first 30 hours. Smaller engine-gensets sooner. When filling the crankcase with oil, be sure to fill it appropriately, as overfilling can cause damage, and the generator will fail to start if the oil level is too low or too high.
For more details, please refer to “Precautions for oil used in diesel gensets”
Clean air filter
The best practice is to run the engine-genset under load for about 30 minutes monthly. Connect it to the load of equipment that uses the motor in operation, such as a box fan or heater. This practice ensures that both the alternator and the engine get a workout. The prolonged no-load process can cause engine-genset failure; repeatedly running the unit under light load can also lead to wet stacking, a buildup of carbon that fouls the engine.
If monthly exercise isn’t possible, do the same 30-minute workout at least every three months; longer workouts are not needed to maintain units. If the engine-genset has not been used for 30 days, apply new oil and a commercial stabilizer before operation or storage. For more details, please refer to “How to clean generator air filter?
Charge the battery
Similar to your engine and alternator, you should charge your battery once a month. Charge for a day, but be careful not to overcharge. If the battery cannot power the electric start, the all-power engine-genset can be manually started using the manual recoil starter. Check the terminals for corrosion, clean them with a wire brush if necessary and inspect the battery.
Fuel tank
Never empty your fuel tank completely; maintain it at a full level to prevent rust and moisture accumulation—an empty tank actually accelerates corrosion. Gasoline left sitting in the tank can go stale in as little as 30 days, forming gum and varnish that clog the carburetor. Adding a fuel stabilizer can extend usable gasoline life up to 12 months during storage. For extended dormancy beyond six months, draining aged fuel and replacing it with stabilized high-octane gasoline—followed by thorough carburetor drainage—prevents fuel degradation and engine damage upon recommissioning.
Spark plug service
Start by cleaning around the spark plug area. Disconnect the spark plug wires. Replace the spark plug if the electrode is pitted or charred or the porcelain is cracked. A healthy spark plug should show a medium to light tan color; any other discoloration signals it needs replacement. Check the spark plug gap with a feeler gauge, then install the spark plug. For gasket-style spark plugs, finger-tighten until the gasket contacts the cylinder head, then turn an additional half turn; for non-gasket spark plugs, finger-tighten until contact, then turn only an additional 1/16 turn. Connect the spark plug wires.
For more details, please see “How to clean a spark plug?“.
Engine-genset storage
When storing an engine block for over three months, always consider removing the spark plug caps, changing the fuel filter, servicing the spark plugs and adjusting the valves.
Long-term storage
Long-term storage is considered unplanned operations beyond six months, but even generators unused for more than 20 days should be prepped for storage to prevent fuel degradation and engine damage. Note: Four-stroke engines need only pure gasoline – no oil mixture.
- Remove and dispose of the old fuel from the tank.
- Fill your tank with high-octane gasoline with a fuel stabilizer (only a tiny amount). Using a stabilizer with fuel system cleaner and cylinder lubricant is best.
- Start the engine and let it run for 5-10 minutes. This gives the stabilizer time to work its way through the fuel system.
- If you are using a stabilizer with fuel system cleaner, let the engine sit for 20-30 minutes. This will also give it time to clean the fuel system of ethanol residue and any other residual fuel.
- Restart the engine and run until completely out of gas.
- The next step is to remove any remaining fuel from the carburetor. Depending on your genset’s manufacturer, this can be done in several ways. First, you have to find the carburetor’s tank. You can find it along the fuel line from the tank to the engine.
Carburetor fuel bowls drain differently depending on design: some use a bottom drain bolt, others a center bolt, and others require full bowl removal via the two corner screws.
If your fuel bowl has a drain at the bottom, loosen the drain bolt or valve and drain the remaining fuel.
If a large bolt is in the middle of the tank, loosen the bolt and drain the fuel. Then retighten the bolts.
If your tank doesn’t have a drain or bolt in the middle, you must remove the tank. This can be done by removing the two screws on the two corners of the fuel bowl bolted to the carburetor. Remove the bowl and pour out any remaining fuel. Then replace the bowl with the carburetor.
The importance of engine genset maintenance
Engine-genset maintenance matters because it keeps the system functioning safely while minimizing the risk of accidents, damage, and more expensive repairs. Routine maintenance helps keep your engine-genset running smoothly and efficiently during a power outage. Proper preventive maintenance can restore power-generating equipment reliability up to 98.5%.
When you don’t maintain your engine genset, the system can experience damage and complications that can negatively impact its ability to function correctly. Generator unavailability after a failure can range from 3 months to a year, depending on component availability, so regular engine-genset maintenance can help keep engine-gensets running efficiently and prevent complications or damage to the system.
As with any engine genset, performing preventive maintenance at least once a year is recommended. Depending on the use and environment the engine-genset will be in, two or even three preventive maintenance checks per year may be required to ensure the safety and efficiency of the system. Following manufacturer-recommended maintenance can extend a generator’s useful life up to 25 years.
Problems you may have without engine-genset maintenance
Regularly scheduled preventive maintenance is critical to optimal engine-genset performance and reduced risks such as:
1. Hazardous situations
If not maintained, engine-gensets can pose safety risks, such as carbon monoxide leaks. When engine-gensets operate, they emit carbon monoxide, a colorless, odorless gas that poses a severe safety hazard and can be deadly within minutes if the unit is run indoors or in enclosed spaces. In addition to maintaining your engine genset, you should also check that carbon monoxide detectors are working correctly to ensure you are notified of any potential carbon monoxide emissions.
Poorly maintained engine-gensets can also increase the risk of electrocution, especially if the engine-genset is wet or may be surrounded by excess moisture or water. Customers who operate engine-gensets in wet conditions must maintain the set regularly and avoid direct contact with moisture to minimize risk.
Another potential hazard is improperly stored fuel or gasoline, which can splash onto engine components and increase the risk of fire. Regular maintenance identifies weak or damaged aspects that may increase fire risk.
2. Expensive repairs
Postponing scheduled maintenance can lead to more expensive repairs and costly complications. Skipping routine care doesn’t save money; it leads to more expensive repairs that could have been minimized or avoided altogether.
Routine maintenance is critical to spot minor issues early on, preventing them from deteriorating and damaging engine-gensets over time and providing the opportunity to fix them when they are more cost-effective and easier to repair. Regular maintenance prevents more expensive repair bills and severe and sometimes permanent damage to your engine genset.
3. Lack of power
One of the most apparent complications an engine genset can face is the inability to supply power efficiently. If an engine genset is left unattended for long periods, it may lose efficiency and overall energy capacity. Engine-gensets require routine maintenance to maintain functionality and provide power during a power outage.
While you may not need engine-genset power at this time, forgetting to service the system can cause severe problems with its ability to run when needed. During a power outage, you want to know that you can rely on your engine genset to run efficiently and effectively. Maintenance ensures that your engine-gensets provide safe, reliable, predictable power during outages.
The importance of industrial engine-genset maintenance
Regular inspections of industrial engine-gensets must be scheduled, including fuel, oil and coolant samples. Reasons to complete engine-genset maintenance include:
a) Maintain power during a power outage
Industrial engine-genset maintenance helps keep your engine-gensets ready to run and provides reliable power during a power outage, keeping critical operations up and running.
b) Keeping critical systems online
Engine-gensets are designed to keep critical systems online and running, providing reliable backup power for necessary equipment that must always be up and running.
c) Extended engine-genset life
Although they are built to last, routine maintenance helps ensure the longevity of your engine-genset. Regular inspections and minor corrections can prevent more significant problems and keep the system functioning properly for its expected lifespan. With proper servicing, industrial power plants can last 15,000 to 30,000 operating hours, while standby units can last 20 to 30 years.
d) Optimized efficiency
Industrial engine-gensets that are regularly inspected and maintained are more likely to run smoothly and reduce unforeseen complications or problems. Because routine maintenance promptly takes care of minor complications, engine-genset owners can be confident that their equipment is well-tuned and reliable.
e) Detect problems early
With any engine-genset, expect minor problems or complications throughout its life cycle. Preventive measures can surely help minimize the risk of these problems occurring. Routine maintenance can also detect problems at their earliest stages, allowing for more effective adjustments and avoiding the need for more costly repairs.
f) Manage costs
Routine inspections and maintenance of engine-gensets is cost-effective and can help save money over time. The cost of regular maintenance dramatically outweighs the costs associated with taking the engine-genset out of service without inspection. Repairs tend to cost more the longer you go without routine inspections.
g) Reduced risk of accidents
Finally, regular maintenance of engine-gensets can reduce the risk of potential accidents or injuries. Failure mechanisms or poorly maintained engine-gensets increase the likelihood of accidents, including fires, carbon monoxide leaks and other problems. Ensuring proper ventilation and a functioning engine-genset can reduce the potential risk of an accident.
Conclusion
Remember, even if the engine-genset is not used very often, you should perform a monthly general inspection by leaving the engine-genset running for at least 30 minutes. Remember our safety tip: Disconnect spark plugs and battery cables before servicing or repairing any power equipment. Wear gloves and safety glasses to protect against harmful debris and chemicals.
As a professional genset manufacturer, BISON understands that reliability starts with precision engineering. Our engine-gensets feature robust core components and optimized combustion systems designed for low fuel consumption, stable output, and effortless routine maintenance. Partner with us to provide your customers with dependable, low-maintenance energy equipment they can trust.
Maintain An Engine-Genset FAQ
What is preventive maintenance for engine-gensets?
Check and drain the fuel filter reservoir, note water in the fuel tank, and inspect the hoses, connections, and wiring within the fuel system. Once a year, change the fuel filter, clean the vent, and test the pipes/connections and fuel quality.
What is the maintenance schedule for the diesel engine-genset unit?
Service frequency depends on usage and running time; as a rough guide, fully inspect and service every six months or 400 hours of operation.
Change oil after the initial 30-hour break-in period, then every 100 hours or 6 months thereafter, and inspect spark plugs every 100 hours or once a season. Service fuel and oil filters every 250 to 500 hours or at minimum annually for standby units.
What are the common problems of engine-gensets?
- Failure to start: Caused by dead battery, empty fuel, clogged filters, or spark plug issues.
- Low oil pressure: Result of improper oil level, degraded oil, blocked filter, or oil pump failure.
- Engine overheating: Triggered by low coolant, blocked radiator, broken thermostat, or water pump issues.
- Unstable voltage/frequency: Caused by RPM fluctuations or a faulty avr.
- Fuel issues: Water contamination, degraded fuel, or damaged lines leading to stalling or poor combustion.
- Abnormal exhaust: Black smoke indicates restricted airflow/rich mix; blue smoke points to burning oil; white smoke signals coolant leak or unburned fuel.
What are the safety tips for engine-genset use?
Follow the instructions that came with your engine-genet. To avoid electric shock, please keep the engine-genset dry and not use it in rain or wet environments. Operate it on a dry surface under an open canopy-like structure, like a tarp supported on poles. Do not touch the engine-genset with wet hands.
Never run an engine-generator set indoors, in a garage, or anywhere engine exhaust may accumulate. Engine exhaust gasses are toxic to breathe and can severely threaten your health, leading to unconsciousness and, eventually, death.
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