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Maintenance of Connecting Rod Bush of Silent Diesel Generator Set

Apr. 29, 2022

The diesel engine is an important part of the silent diesel generator set and the power source of the generator. The maintenance of the diesel engine of the silent diesel generator set is the most critical step. The engine is composed of many parts, and it is crucial to maintain any of them. Next, Starlight Power Equipment will introduce some problems of the connecting rod inside the engine of the silent diesel generator set.


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As long as the main bearing and connecting rod bearing of the diesel engine of the silent diesel generator set are used, there will be no problems as long as the brand of the oil is paid attention to, regular maintenance and correct operation. However, due to improper use and maintenance, abnormal noise of the connecting rod bearing bush will also be caused.


The performance of the abnormal noise of the connecting rod bearing is: when the engine suddenly accelerates, there is a continuous and obvious knocking sound, and the sound is crisp, short and firm, and the sound increases with the increase of the engine speed and with the increase of the load. The sound does not change much when the engine temperature changes; when running at idle speed and medium speed, you can hear the sound of "grazing"; in the fuel-cut test, the sound is obviously weakened.


The reasons for the failure of the connecting rod bush of the silent diesel generator set are as follows: poor lubrication. The fitting clearance between the journal and the bearing bush does not meet the standard. If the oil grade is wrong, adding ordinary diesel engine oil will cause poor lubrication, resulting in accelerated wear of the bearing bush, resulting in burning of the tile. Then there is the problem of the oil pipeline, there is a lot of leakage, causing the engine to burn tiles. The inner hole of the big end of the connecting rod is worn, the bearing bush goes to the outer circle, the oil hole is blocked, the journal is oval, and the contact between the bearing bush and the journal is poor. The quality or installation of the bearing bush deforms the bearing bush, causing the alloy to fall off and burn the bush.


The judgment of abnormal noise of connecting rod bearing bush is as follows: Cylinder-by-cylinder oil-cut test. From idle to medium speed, shake the throttle, and the sound increases as the engine revs increase. Gently shake the throttle, you can hear the sound of "grate", and the sound is prominent at the moment of refueling, the sound of oil cut is reduced, and the sound of the moment when the oil supply is restored becomes louder. When you hear this sound, you can judge that the connecting rod bearing is ringing; if you remove the oil filler cap, you can hear a strong "dangdang" knocking sound; when the vehicle is running, increase the accelerator or change from low-speed to high-speed When the gear was refueled, I heard a "dangdang" percussion sound from the engine.


The above situation is the sound of the quiet diesel generator set burning tile failure, but the crankshaft has not locked and can continue to rotate. If you suddenly hear the sound of "chirp, chirp" when the vehicle is running, it is due to the lack of lubrication of the bearing bush and the sound of burning and melting. It should be stopped immediately, otherwise the crankshaft will lock up, the difficulty of repair will increase, and the cost will increase.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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