The solution to this noise is to hire one of our electricians to replace or repair the loose or missing screws. A high-pitched whine usually points to a problem. Worn bearings, a misaligned belt, or an alternator issue could cause the problem. It's normal for a generator to produce noise, but a generator producing loud, strange operational noises isn't normal. Continue reading to understand the common causes behind these sounds and learn how to respond to restore your generator. In this guide, we'll look at common causes of generator noise, diagnostic steps. A generator that makes metallic clanking noises could have loose or broken parts in it. These parts include the connecting rods, crankshaft parts, fasteners, mounting screws, and the rotor.