Why does oil sometimes drip from the exhaust pipe when the generator load is too low

Why does oil sometimes drip from the exhaust pipe when the generator load is too low?

If the unit operates under a small load, as the running time continues, the following faults will occur

1. The piston-cylinder liner seal is not good, causing engine oil to seep up and enter the combustion chamber for combustion, resulting in blue smoke coming out of the exhaust.

2. For turbocharged diesel engines, due to low load or no-load conditions, the boost pressure is low. This can easily lead to a decline in the sealing effect of the turbocharger oil seal (non-contact type), allowing engine oil to seep into the boost chamber and enter the cylinder along with the intake air.

3. Some of the engine oil that surges up into the cylinder participates in combustion, some cannot be completely burned and form carbon deposits on the valves, intake ports, piston tops, piston rings, etc., and some is discharged with the exhaust. In this way, engine oil will gradually accumulate in the exhaust passage of the cylinder liner and carbon deposits will also form.

When the engine oil accumulates to a certain extent in the boost chamber of the turbocharger, it will seep out from the mating surface of the turbocharger.

5. Long-term operation at low load will lead to more serious consequences such as accelerated wear of moving parts and deterioration of the engine combustion environment, which will result in an earlier overhaul period.

Therefore, foreign diesel engine manufacturers emphasize that for both naturally aspirated and turbocharged models, the low-load/no-load operation time should be minimized as much as possible, and stipulate that the small load should not be less than 25% to 30% of the rated power of the unit.

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