26-10-2021, 07:28 PM
Don't be fooled into dismissing gudgeon pin wear just because there is no evidence on the side of the bore. That sort of damage only occurs if the clamping bolt fails and allows the pin to move side to side. On standard engines, the pin is firmly clamped inside the end of the connecting rod and it is the piston that provides the bearing surface. If there is any 'rock' between the piston and the gudgeon pin at all, it will make a noise.