Before starting a diesel generator set, it is essential to check whether all switches and operating conditions are properly prepared. The engine should only be started when all requirements are met. Proper operation and maintenance help keep the generator in a “healthy” state, improving efficiency and extending service life.
Never start the diesel generator without sufficient cooling water in the tank. Adding cold water after the engine has started can cause sudden temperature changes, leading to cracks or deformation in critical components such as the cylinder liner and cylinder head.
Similarly, adding boiling water to a cold engine may also cause damage. The correct method is to add cooling water before starting, preferably warm water at around 60°C to preheat the engine.
Do not set the decompression handle to the working position before supplying fuel. The throttle should be set to the fuel supply position before starting the engine.
Incorrect operation can lead to fuel waste and excessive diesel entering the cylinder, washing away lubrication on the cylinder wall and increasing wear on the piston, piston rings, and cylinder liner. It can also dilute engine oil and lead to carbon deposits.
The correct approach is to preheat the engine first, then supply fuel, and finally start the generator.
When the diesel engine is cold, the lubricating oil becomes viscous, increasing resistance between moving parts. Push-starting under these conditions can accelerate wear and reduce engine lifespan.
Different seasons require different types of lubricating oil and fuel. In summer, high temperatures demand lubricants with better heat resistance (such as grades 40, 50, or 60). Failure to switch oils can lead to oxidation, degradation, and increased oil consumption.
In winter, using high-viscosity oil or diesel with a high freezing point can make starting difficult and increase internal resistance, accelerating wear of engine components.
When preheating is necessary, open flames such as coal fire should be used carefully and kept at least 30 cm away from the oil pan. The crankshaft should be rotated slowly to ensure even heating of the oil.
Never ignite fuel at the intake pipe, as ash and debris may enter the cylinder, causing valve sealing issues and increased wear.
Glow plugs and flame preheaters consume high electrical power and generate significant heat. Prolonged use may damage the battery or burn out the heating element.
The glow plug should not be used continuously for more than one minute, and the flame preheater should be limited to 20 seconds per use.
Although adding oil into the cylinder may help with cold starting, it can lead to incomplete combustion and carbon buildup. This reduces piston ring elasticity and cylinder sealing performance.
Over time, it accelerates cylinder liner wear and reduces engine power, making starting more difficult. Therefore, oil should not be added directly into the cylinder.
The starting motor operates under high current and low voltage conditions. Continuous operation can quickly drain or damage the battery.
Each start attempt should not exceed 5 seconds. If the engine fails to start, wait at least 15 seconds before trying again.
After a cold start, lubricating oil has high viscosity and flows slowly, delaying proper lubrication of moving parts. Running the engine at high speed immediately can cause severe wear on gears, bearings, and cylinder components.
In extreme cases, insufficient lubrication may even lead to bearing seizure or engine damage. Always allow the engine to warm up at low speed before increasing load.
Following proper starting procedures and avoiding these common mistakes can significantly improve the performance, reliability, and lifespan of diesel generator sets. Regular maintenance and careful operation are key to ensuring efficient and safe generator use.
