Why does my Cummins whistle?
Why does my Cummins whistle? If you hear a high-pitched whistling sound from your Cummins engine, there's a good chance it involves a boost leak. A boost leak happens when the clamps and other components leak out air when under pressure from the turbochargers. Why do diesel trucks squeak? Although there are a few causes of a squealing engine, one of the most common is a bad or failing serpentine belt. The belt drives many of the engine's accessories, including the alternator and power steering pump. Therefore, when a serpentine belt goes bad, these accessories stop working. What causes turbo...