Can a Diesel Engine with Excessive Crankcase Ventilation Continue to Be Used?

[SanJackson]

Diesel Engine with Excessive Crankcase Ventilation, the vehicle can still be used, short-term use is not a big problem, but long-term use is not recommended, because this is caused by piston ring fracture, after the fracture, the piston loses stability, so the piston impact is large and easy to break, after the fracture, the connecting rod is easy to damage the engine. Reasons for Excessive Crankcase Ventilation in Diesel Engines: 1. Severe wear of the engine piston rings and cylinder liners: Piston top burning or cylinder scoring, if the piston rings and cylinder liners are severely worn, or the piston top is burned and the cylinder is scored, it will cause the seal between the piston rings and the cylinder liners to be loose, and during the compression and expansion process of the diesel engine, a large amount of compressed gas will enter the crankcase through the small gaps between the piston rings and the cylinder liners, leading to an increase in crankcase exhaust pressure. The main symptoms include severe crankcase ventilation, insufficient engine power, and possibly blue smoke. The solution is that the engine needs at least a medium repair, and the specific situation needs to be determined by disassembling the engine. 2. Incorrect installation of engine piston rings: Piston ring alignment, if the piston rings are installed incorrectly with all openings aligned, even if the piston rings are not worn, it will cause a large amount of high-pressure gas to enter the crankcase during the compression and expansion process, resulting in an increase in crankcase exhaust pressure. Or piston ring sticking, fracture, piston ring sticking, fracture, or loss of elasticity will all lead to poor cylinder sealing, allowing combustion gases to leak into the crankcase, causing a significant increase in crankcase exhaust pressure. The solution is naturally to disassemble and reinstall. 3. Severe wear of the air compressor piston rings: Leading to air compressor blow-by, compressed gas enters the engine crankcase through the air compressor's crankshaft connecting rod mechanism, resulting in excessive crankcase exhaust. For engines equipped with an air compressor, if excessive crankcase ventilation occurs, it should also be considered whether it is caused by the air compressor. However, this situation will not cause a decrease in engine power, but the air compressor will have insufficient compressed gas, and there will definitely be engine oil inside the air passage when disassembled. The solution is to repair or replace the air compressor.