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Lower Unit Noise: Bearings, Gears, or Something Else? If your outboard is making unusual noise, especially from the lower unit, it is not something to ignore. What starts as a small sound can quickly turn into a major repair if left unchecked. The key is understanding what the noise might be telling you. Grinding or Growling Noise A grinding or deep growling sound is one of the most serious warning signs. This is often related to worn or failing bearings or internal gear damage. Common causes: …