← Back Bergen B00702100 Valves Spring Air Exhaust

The code B00702100 identifies a valve spring. Often, in heavy-duty engines of this size, these springs are installed in concentric pairs (an inner and an outer spring) for each individual valve.

The function of this spring is purely mechanical yet absolutely vital: it must rapidly and forcefully return the valve (whether intake or exhaust) to its closed, sealed position against the seat (like code B01051235) the exact moment the pushing action of the camshaft ends.

Because the engine runs at hundreds of revolutions per minute, these springs are compressed and released millions of times over their operational lifespan. Consequently, they are manufactured from specialized, ultra-high-strength spring steel. If a spring were to fatigue, lose its tension (spring sag), or snap, the valve would not close in time. This would lead to a severe loss of compression or, in the worst-case scenario, a catastrophic collision between the rising piston and the open valve.