Current testing requirements for high temperature alloys are defined in general industry specifications (ASTM, AMS), as well as in user specifications. Many of these requirements were established in the 1960's when production practices were yet to be refined.
cowling - protective covering consisting of a metal part that covers the engine; there are powerful engines under the hoods of new cars; the mechanic removed the cowling in order to repair the plane's engine.
Set the dirt bike upright and engage it in first gear to immobilize it. Locate the side cowl, also called the pull-rope case, on the side of the engine. It will be either plastic or metal and have a circular profile. Look for the three or four mounting bolts that hold the cowl to the engine.