Spring starter is a mechanical device used to start engines, commonly in marine or diesel-powered applications. It works by using the stored energy in a wound spring to provide the initial rotational force needed to turn an engine. This process is both simple and reliable, making it ideal for various industrial and marine uses.

1. Energy Storage
The spring starter consists of a high-tension spring that is wound manually or via an automated system. This spring stores energy as it is tightened.

2. Triggering the Start
Once the spring is fully wound, the starter engages with the engine's flywheel. When the spring starter is activated, the energy stored in it is released, causing it to unwind rapidly.

3. Engine Cranking
As spring unwinds, it engages a gear mechanism with the engine's flywheel, causing the engine to turn over. This initial rotation is typically enough to start the engine, especially in small diesel or marine engines.

4. Recoil and Reset
After spring has passed, the starter must be reset by manually or automatically rewinding the spring to prepare for the next use.