What is the correct approach when replacing a timing chain?

When replacing a timing chain, it is important to replace it along with the timing sprockets. This is because the wear and tear on the sprockets can affect the performance and longevity of the new timing chain. Over time, sprockets can develop wear patterns or damage that can lead to improper alignment or tensioning of the chain, which could cause premature failure or running issues after installation.

Replacing the sprockets ensures that the entire timing system operates smoothly and effectively. This approach maintains the integrity of the timing mechanism, leading to better performance and reliability of the engine. The new chain and sprockets will mesh correctly and maintain the manufacturer's specifications for timing, which is crucial for optimal engine operation.

Therefore, the correct choice emphasizes that both components should be changed simultaneously to avoid future complications and to ensure that the timing system functions as intended.