NCCER Millwright Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

The most common symptom of packing failure is excessive leakage. When packing around a shaft or valve fails, it typically allows fluids or gases to escape from the system, resulting in visible leaks. This type of failure can occur due to wear, age, or improper installation, leading to a compromised seal that no longer holds pressure effectively.

Excessive leakage not only indicates a problem with the packing but can also lead to more significant issues, such as equipment damage or operational inefficiencies. While increased noise, frequent adjustments, and excessive heat may also be symptoms of mechanical problems, they are not as directly associated with packing failure as leakage is. Leakage serves as a clear and immediate indicator that maintenance or replacement of the packing is required for the system to operate effectively again.