The sealing face and seating area fo the spindle & guide and non-return valve are grinder on special grinding machines. Very important for successful operation is that the grinding angle from spindle and seat is slightly different
Each reconditioned fuel valve is inspected by blue print. After reconditioning the final clearance and lift is measured and put in the final inspection report. The atomisation of each reconditioned fuel valve component is tested as per the requirements of the engine builders