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back fire to gas engine

Hello,

 

I have some problems with one of my engines G3516E. The engine runs normally on full load and some times i can hear a noise from the exhaust like an explosion. After this insident the engine becomes unstable and shuts down. I have a diagnostic tool CCM pc but i reseave no error codes when this insident happens. I set all the parameter of the engine from the begining, i made compression test to all cylinders and it is ok, i used a mobile camera to check the cylinders condition and it is ok. I have spoken with my caterpillar dealer but still no answer about the problem. Does anybody know what cause this problem and what are the actions that i have to do in order to solve it?

 

Thank you

 

George 

Everything goes electric