Which component contains slots with adjustment bolts?

• A. Adjustable Cam Gear
• B. Cam Bushing
• C. Pushrod
• D. Rocker Arm

Answer: (A)

Fine-tuning when the valves open and close is done by adjusting the cam timing, and the component that contains slots with adjustment bolts is the adjustable cam gear. The gear is designed with elongated slots that allow a precise shift in the cam’s position relative to the crank. Loosening the bolts, sliding the gear along those slots to the desired position, then tightening locks in the exact timing you need for optimal engine performance.

Cam bushings are fixed bearings that support the camshaft, so they don’t provide a means to adjust timing. Pushrods simply transfer motion from the lifter to the rocker arm and aren’t used for timing adjustment. Rocker arms transmit motion to the valves and may have lash adjustments in some designs, but they don’t feature slots with adjustment bolts used for setting cam timing.