Methods to troubleshoot generator set cylinder failure

Many companies are helpless in the face of the problem of cylinder pulling Therefore, Gu Zhiqing, a technical expert from Haixing Power Technology Co., Ltd., came to solve the problem for the public.by generator sets .

Generally, when we find that the external characteristics of the generator set after the cylinder is pulled, the sound changes and black smoke is emitted from the exhaust gas, the cylinder may appear. Another situation is that the working surface of the piston, piston ring and cylinder liner are damaged, the gas seal fails, the oil consumption and air bleeding volume increase rapidly, causing the engine to not operate normally, and even stop in a very short time due to the piston, piston ring and cylinder liner being bitten to death. .Gu Zhiqing believes that the main reason for pulling the cylinder is actually the 'welding' strain of the piston, piston ring and cylinder liner surface due to high temperature. That is, the piston does not cause dry friction between the cylinder liner due to the interruption of the oil film. The hot friction heat causes the metal to micro-melt and stick, and pulls off nearby metal particles.
The fundamental reason for the cylinder pulling of diesel generator sets is the interruption of the oil film. According to the requirements of gas sealing, the gap between the piston ring and the cylinder liner should be as small as possible, which makes their lubrication conditions very unfavorable. When the contact surface is overloaded, the cylinder liner surface and the piston ring working surface are violently rubbed due to direct contact, resulting in a large amount of friction heat, causing the temperature of the working surface to rise sharply, and the consequence is that the two friction surfaces are welded and adhered to cause strain.

It can be seen from this that we, Haixing Power, believe that poor oil supply conditions, severe air leakage, and excessive contact stress of parts destroy the oil film, are the main reasons for the cylinder pulling. In addition to lubrication, matching clearance, and part manufacturing quality, improper use may also cause the cylinder pulling of the diesel generator set. Specifically, there are the following points:
1. The matching clearance between the piston and cylinder liner is too small, or has not been well run-in before formally loaded work.
2. Poor lubrication, such as small gap, thin engine oil or unoiled during assembly.
3. The diesel engine is overheated.
4. The body is not clean during assembly or the piston is installed too dead.
5. Poor quality of piston and piston ring.
We at Haixing Power believe that from the perspective of use, we should also pay attention to avoid sudden increase in load or emergency stop. Before starting, try to use a shaker to rotate the crankshaft several times to keep the friction surface lubricant.