What Causes the Metal Friction Sound When Starting the Engine?

[SanLucas]

Engine starting with a metal friction sound is generally a sign of damaged bearings in the generator, water pump, or power steering pump. Introduction to the engine: An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy. The first external combustion engine was invented in 1816 by R. Stirling in the UK (Scotland) and later improved by Watt into the steam engine. Types of engines: The term engine can refer to both the power-generating device and the entire machine including the power unit (e.g., gasoline engine, aircraft engine). Types include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), gas turbines (used in racing cars), electric motors, etc.