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
Use one of the three tools in set J 23068 to establish the
proper alignment. Figure 1 illustrates the use of the'
When confronted with an alignment job, test fit each tool
to determine which provides the best fit and proceed to
make the alignment with that tool.
Correct alignment is established when there is no
tachometer drive shaft bind on the inside diameter of
the tool when one complete hand revolution of the
Fig. 1 - Checking Tachometer Drive Shaft Alignment
engine is made.
tachometer drive adaptor is installed on an engine, it is