Why is it important to follow manufacturer specifications when tightening spark plugs?

Following manufacturer specifications when tightening spark plugs is crucial to avoid damaging the threads or gaskets. Spark plugs need to be tightened to a specific torque to ensure a proper seal within the cylinder head. If they are over-tightened, this can strip the threads in the cylinder head, leading to costly repairs and potential engine damage. Conversely, under-tightening can cause the spark plugs to become loose over time, resulting in misfires and decreased engine performance. Proper torque ensures that the spark plugs are securely fastened without compromising the integrity of the engine components involved, thus maintaining their functionality and longevity.

Other considerations, such as compatibility with fuel types or preventing overheating, while important in their own contexts, do not directly relate to the mechanical aspects of spark plug installation and damage prevention. Aesthetic appeal has no relevance in this technical application and does not affect engine performance or reliability.