How can a technician ensure the correct installation of a camshaft?

To ensure the correct installation of a camshaft, aligning the timing marks and verifying valve clearance is essential. The camshaft plays a critical role in the engine's timing, controlling the opening and closing of the intake and exhaust valves. Accuracy in alignment ensures that the camshaft is synchronized with the crankshaft, allowing for optimal engine performance.

By aligning the timing marks, the technician confirms that the camshaft is in the correct position relative to the crankshaft at the top-dead-center of the compression stroke. This synchronization is crucial for the engine to run smoothly and efficiently. Additionally, verifying valve clearance is important as it ensures that the valves have enough space to open fully without interference. Improper valve clearance can lead to engine damage or performance issues like misfiring or loss of power.

In contrast, tasks such as replacing the oil filter, adjusting the fuel mixture, or cleaning spark plugs do not directly influence the proper installation of a camshaft. These actions serve different maintenance purposes and do not address the mechanical alignment or operational parameters needed for correct camshaft function.