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 TM 55-1905-219-14-4
3-23. TACHOMETER DRIVE - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSTALLATION (Cont)
ALIGNMENT
11.
Tacho-
Whenever a tachometer drive cover assembly or a tachometer drive adaptor is
meter
installed on an engine, it is important that the cover assembly or adaptor be
drive
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
components.
Correct alignment is established when there is no tachometer drive shaft bind on the
inside diameter of the tool when one complete hand rotation of engine is made.
3-631
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