3-23. TACHOMETER DRIVE - MAINTENANCE INSTRUCTIONS.
Whenever a tachometer drive cover assembly or a tach-
ometer drive adaptor is installed on an engine, it is
important that the cover assembly or adaptor be aligned
properly with the tachometer drive shaft.
Misalignment of a tachometer drive shaft can impose a
side load on a tachometer drive cable adaptor resulting
in possible gear seizure and damage to other related
Correct alignment is established when there is no tach-
ometer drive shaft bind on the inside diameter of the
tool when one complete hand rotation of engine is made.