What happens if the valve spring installed height is not within specification?

If the valve spring installed height is not within specification, it indicates that the spring is either too compressed or not compressed enough when installed on the engine. This incorrect height can disrupt the proper function of the valve train, potentially leading to issues such as improper valve timing or insufficient pressure on the valve seats.

To correct the valve spring height, shimming is often used. Shims are small pieces of material placed under the spring to adjust the height and achieve the correct installed measurement. By adding shims, the spring can be brought back into specification without the need to replace the entire assembly, making this a practical and cost-effective solution.

Maintaining the correct valve spring height is critical for the overall performance and reliability of the engine, as it ensures that the springs operate within their designed parameters, contributing to effective valve operation and preventing potential engine damage.