Valve Guides are grounded to a surface finish of 0.80 Micro Ra on its Outer Dia and with in a tolerance of 13 Microns. Delight Valve Guides are also provided with Thread and Spiral in its Inner Dia to retain oil for long time. Thus increases the life of both Valve Guide and the Valve.
Valve Guide has microstructure of Pearlitic matrix with 5% maximum free ferrite 5% maximum free carbides an d10% maximum steadite in cellular or discontinuous form and Valve Guide has Hardness of 210-260 BHN
