Valve stem and valve guide are one of the major frictional part in internal combustion engine system. Wear of valve guide causes to expand clearance between valve stem and valve guide. Oil drawn into the engine caused by excessive clearance is causati...
Valve stem and valve guide are one of the major frictional part in internal combustion engine system. Wear of valve guide causes to expand clearance between valve stem and valve guide. Oil drawn into the engine caused by excessive clearance is causative of wrong spark ignition, higher unburned He emission, rapid buildup of carbon deposits, Inadequate valve cooling and premature valve failure. We have performed tribological test for various material combination between valve stem and valve guide and introduce results in this paper.