Usage:
All Engines Equipped With AiResearch Model TV81 Turbochargers
Description of Change: The turbine wheel used in shaft and wheel assemblies for AiResearch Model TV81 Turbochargers is now made of a stronger material. This will prevent turbocharger failures which can be caused by a broken turbine blade in some specific load conditions. Formerly, it was possible for some conditions to cause a vibration stress which broke one blade of the turbine wheel. This destroyed the balance of the shaft assembly, and the result was heavy damage to the turbocharger bearings and other parts.
Adaptable As: Direct replacement. The part numbers of the 6N4606 and 9N2043 Turbine Shaft And Wheel Assemblies did not change. Identification of the improved part can be made by a number "4" on the nose piece of the turbine wheel.