The Review of Journal Bearing Oil Clearance and Lubrication Management for Turbo Generators is reported. The underlying tribological principles relating friction, wear and lubrication are considered. The dependence of lubricant film thickness on : Radial clearance between the leg journal and cone; Radius of the leg journal; Lubricant viscosity; Rotational velocity of the cone and Applied load is observed. The interplay between friction, wear and lubrication is observed.