Which component measures clearances as it depresses easily and doesn't bend the pushrod?

• A. Lifter
• B. Checking Valve Spring
• C. Pushrod
• D. Camshaft

Answer: (B)

Measuring valve lash relies on applying a small, known preload so you can read the gap between the rocker arm and the valve stem without loading the system too much. A checking valve spring is designed for this purpose: its spring rate is light, so it depresses easily and lets you compress the valve train just enough to measure the clearance with a feeler gauge. Because the preload is minimal, it won’t transmit enough force to bend the pushrod. The other components—lifter, pushrod, and camshaft—are part of the operating mechanism and aren’t used as a controlled measuring tool, so they wouldn’t provide a reliable or safe reading. Using the actual valve spring, which is much stiffer, would distort the clearance and could risk damage.