Hot spots found on the cylinder bore near the exhaust valve indicate that the engine has experienced some localized overheating. Technician A says that the hot spots are signs of cylinder bore damage and should be repaired through a resizing process. Technician B says the hot spots are nothing more than carbon stains left by the vaporization of oil on the cylinder bore. Who is correct?
Hot spots on cylinders is an indication of localised heating of the engine, the continuous heating of the engine may cause spots on the cylinder. they are not a sign of bore damage or carbon stains.
