FDL Top Dead Centering Device

This tool is placed in the #1 right cylinder bore of a GE Main Frame to determine crankshaft top dead center. It is used mainly on new or re-manufactured main frames. The crankshaft is rotated to a position where the travel on the dial indicator is maximum.
 
There may be 2 or 3 points where the crankshaft registers maximum travel on the dial indicator. The crankshaft should be centered in the dead band to locate top dead center. Once the crankshaft is in this location, use the T12300 Timing Tram Bar to mark the #1 right main frame doorway with a prick punch mark approximately 1/8" wide.