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How to service a diesel generator?

Jul 23, 2025

Diesel generators are a type of internal combustion engine.


Compared to a gasoline engine, which requires a spark plug to provide ignition, a diesel engine uses compression to generate high pressure and high temperature to ignite the gasified fuel to generate power. It runs on the principle of the Diesel cycle, was invented in 1892 by German engineer Rudolf Diesel, from the name of the diesel engine can be seen in most of the current diesel engine fuel for diesel fuel, but Diesel's invention was intended to be able to generate electricity through the use of different types of fuels, he started out by using peanut oil to generate electricity.

 

So what do we need to do to keep a diesel generator functioning properly?
First of all, let's understand the principle of operation of the diesel engine: diesel engine based on compression-ignition internal combustion engine work cycle operation, without spark plugs, through the suction, compression, work, exhaust four strokes of diesel chemical energy into mechanical energy. During the period of each part, including the cylinder and piston and so on in the energy conversion process play an essential role, so how to maintain the diesel generator need to pay more attention to these aspects.

 

The following are some of our recommendations for the maintenance of diesel engines, such as maintenance process problems please contact us, we will provide free solutions.

 

How to maintain the fuel system? You need to replace the fuel filter and oil-water separator regularly, drain the water in the oil-water separator regularly, clean the fuel tank at least once a year, and avoid the use of poor quality diesel fuel.

Replace the fuel coarse filter and fine filter to avoid impurities into the injector nozzle or high-pressure pump, resulting in wear and clogging. Drain the water in the separator regularly (especially in humid environment or when using low quality fuel) to prevent water from corroding the fuel system components. Clean the fuel tank at least once a year to remove impurities and water deposited at the bottom; check the sealing of the fuel line fittings to prevent oil leakage or air intake (air intake will lead to poor fuel supply and loss of power). Avoid the use of low-quality diesel fuel (high sulfur content, impurities), long-term use will aggravate the injector nozzle, piston carbon deposits, and even damage the high-pressure common rail system.

 

On the other hand, cooling system maintenance requires regular replacement of coolant and cleaning of the water tank, regular inspection of the water pump, thermostat and water level.

 

Replace the coolant (use long-lasting antifreeze, avoid adding water), before replacement, the cooling system needs to be thoroughly flushed to remove scale and rust. Check whether the water tank, water pipe and radiator are clogged (such as willow, dust accumulation), you can regularly flush the surface of the radiator with a high-pressure air gun or water to ensure the efficiency of heat dissipation. Check the coolant water level every week, and replenish the antifreeze of the same type when it is insufficient (do not add tap water directly to avoid scale). If the engine warms up slowly or overheats, the thermostat may be faulty; if the water pump leaks or rattles, it needs to be replaced in time to prevent the coolant from leaking and causing the engine to overheat.

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