Preventing Catastrophic Camshaft Lobe Failures in Low Emission Diesel Engines

摘要

With the drive to reduce emissions and improve fuel economy, fuel injection pressures have increased. This has increased Hertzian stresses on the roller follower cam system to the point that cam lobe contact fatigue failure has become the "Achilles heel" of diesel engine durability in the 1990s. Contact fatigue failures have occurred on both injector lobes and the exhaust and inlet lobes. This is particularly the case in fleets with frequent engine shut downs and stars, stop-go service and in some line-haul fleets.