Which component can extend or retract to determine proper pushrod length?

• A. Checking Pushrod
• B. Camshaft
• C. Pushrod
• D. Adjustable Cam Gear

Answer: (A)

Determining proper pushrod length is all about testing the valve train geometry by simulating different lengths. The tool used for this is a Checking Pushrod. It’s designed to be extended or retracted so you can mimic different pushrod lengths while the lifter and rocker are in their operating positions. By adjusting its length and watching how the rocker arm, lifter, and valve stem align through the full lift, you can find the length that gives correct geometry, proper valve-lift, and no binding.

This is why the Checking Pushrod is the best answer. Regular pushrods can’t be varied in length to test the geometry, the camshaft sets timing rather than pushrod length, and an adjustable cam gear adjusts timing—not pushrod length.