The most common type of generator set is the diesel generator set. In discussing the reasons for oil consumption in second-hand generator sets, we take the diesel generator set as an example, hoping it will be helpful to your work. Especially for those using second-hand generator sets, it is crucial to pay attention to these issues to avoid equipment damage due to timely detection or discovery. For a detailed analysis of the reasons, please see our introduction below.

Excessive oil consumption in diesel generator sets is often due to reasons such as severe wear in the diesel engine's compression system, incorrect piston assembly, damage to the sealing washers at various connections in the engine body, and damage to the side walls of the oil sump, among others.

One, when discovering excessive oil consumption, first inspect for oil leakage at the engine body, gear cover, large disc on the side of the running wheel, rear cover, and cover shield connections. If oil leakage is present, observe whether the sealing washers at each connection are intact and replace any damaged ones. If the sealing washers are intact, check if the bolts are loose at each part. Tighten the loose bolts to the specified torque with a wrench. If these parts are mostly normal and the oil leakage is at the frame location, inspect the oil sump, focusing on the front side of the oil sump on the same side as the running wheel. This is often due to loose mounting bolts, where the running wheel rubs against the angle iron of the frame that protects the oil sump for an extended period under the pull of the belt, wearing through the oil sump and creating a gap that leads to oil leakage.

Long-term wear on the engine due to normal usage or improper maintenance can lead to longitudinal scratches on the cylinder liners of diesel engines. This results in the cylinder diameter and piston side clearance exceeding the specified values, causing the piston rings' support force to decrease, leading to insufficient oil scraping. Alternatively, if the internal support spring in the oil ring breaks at the opening position, it can cause poor oil scraping and contribute to combustion, leading to severe oil consumption symptoms. This is characterized by difficulties in starting the diesel engine, with a noticeable blue smoke emitted from the exhaust pipe and severe fuel injection in the breather. Furthermore, if the piston is assembled with the wrong orientation, the combustion chamber is inverted, which won't affect the engine's starting but will lead to significant oil consumption, with daily fuel consumption around 0.5 kilograms.

Severe valve guide wear can also lead to burning engine oil in diesel generators, although this situation is rare. However, according to the introduction of relevant information, it is a cause that should not be overlooked.