In engine maintenance, why is it crucial to remove the camshaft prior to the tappets?

Removing the camshaft before the tappets is crucial primarily to prevent damage to the tappets. The tappets, or lifters, ride on the camshaft, and if the camshaft is not removed first, any attempt to extract the tappets could result in them being jammed or damaged due to the push rods and springs being under tension. When the camshaft is in place, it maintains contact with the tappets, which are designed to follow its contour. If brutal force is used to remove the tappets without removing the camshaft, this can lead to deformation or breakage of the tappets and other associated components.

In essence, careful sequencing in engine disassembly helps maintain the integrity of the components. Each component has a specific order of removal to manage tension and clearances effectively. By removing the camshaft first, it ensures that the tappets can be taken out safely without risking damage. This basic principle of maintenance is crucial in ensuring the reliable performance and longevity of the engine.