Unusual Sound Coming from Generator's Diesel Engine Prime Mover


Thread Starter



can anyone help me? our generator was new overhauled. during testing, i observed that when load goes down to 250kw and below a rough and unusual sound coming from the diesel engine prime mover. but as the load goes higher, sound become ok and more smooth, as a normal. any ideas?

thank you in advance...
Please describe this sound a bit more.

On mechanical turbo-diesel engines it is normal to hear valve rockers clapping when the load is lower. there is also a nonlinear point once the turbine kicks in, and a change of working sound. (I'm working with Cummins engines and gensets specifically). Is this what you were looking for or something else? Smoke? Bearing problem?