Which component's durability can be enhanced by a double roller design?

• A. Timing Chain
• B. Camshaft
• C. Lifter
• D. Pushrod

Answer: (A)

A double roller timing chain is built with two rows of rollers, which spreads the load and reduces wear on the chain itself. This design lowers chain elongation and backlash, helping the chain resist stretching under high rpm and heavy loads. Because the improvement is in the chain’s ability to endure wear and maintain accurate timing, the component that benefits most directly is the timing chain. The other parts—camshaft, lifter, and pushrod—rely on the timing of the chain, but their own durability isn’t directly enhanced by the chain’s double-roller construction in the same way.