What is the recommended action when discovering a warped cylinder head with an overhead camshaft?

When a warped cylinder head is identified, particularly in engines with an overhead camshaft, the recommended action is to first check for cracks and then proceed to resurface the head if it is determined to be structurally sound.

Resurfacing involves machining the mating surface of the cylinder head to ensure it is flat and can form a proper seal with the engine block. This process is often effective for correcting warpage that does not involve structural damage. By verifying that there are no cracks, you ensure that resurfacing will not compromise the integrity of the head, as cracks can lead to coolant leaks, oil leaks, and other performance issues once the engine is reassembled.

This approach balances the need for effective repair with the caution necessary to avoid potential failures. While replacing the head might seem like a more definitive solution, it is often cost-prohibitive and unnecessary if the head can be effectively resurfaced. Other options, like straightening or attempting to repair the warp without checking for cracks first, could risk further damage to the component and ultimately lead to engine failure. Thus, checking for cracks followed by resurfacing if the head is deemed sound is a practical and effective strategy.