Which technician is correct regarding the effects of excessive grinding of valve faces and seats?

Excessive grinding of valve faces and seats can lead to several detrimental effects on engine performance and longevity. When valve faces and seats are ground excessively, it can result in improper seating of the valves, leading to poor sealing. This inadequate seal can cause compression loss, decreased engine efficiency, and potential misfires, negatively impacting overall engine operation.

Additionally, excessive grinding can affect the angle and design of the valve seat, disrupting the proper flow of air and fuel into the combustion chamber. This change can result in uneven wear or overheating of the valve and seat, as they may no longer align properly or maintain optimal contact under operational conditions.

Given these insights, it becomes clear that the technician highlighting these issues offers a correct perspective on the consequences of excessive grinding. Understanding these implications is crucial for maintaining engine performance and ensuring the longevity of valve components.