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well we need more info on your problem to be able to give you a fairly good answer. is it a tapping sound,knocking sound. where does the sound comes from top or bottom of engine. just listen to it and try to determine where you hear that sound the most. trust me it may be nothing expensive.

As the previous user suggested we need more info. A source of noise can be the combustion itself. The phenomenon sometimes responsible for noise inside engine is called combustion instability. This phenomena is caused by coupling between the acoustics (caused by the injection system, fluid flow etc) and the combustion itself. When this two couple and the excess energy can't be dissipated the perturbations inside the combustion chamber grow and the entire combustion process becomes unstable. The engine becomes very noisy and you can see a lot of vibrations. On a side note, combustion instability is a phenomena very important in rocket engines. That's actually the reason why USA won the space race to the moon against Russia. Russia was not capable to solve the stability of combustion in large engines as US did.

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Q: What might cause a noise in the engine and the engine is missing?
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