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TM 55-1905-223-24-5
(1)
Loosen the thumbscrew for the piston travel gauge. Move the gauge so that the stem
of the gauge is in the center of the piston plunger rod.
CAUTION
Both indicators must have a travel range of at least 0.250 inch or the indicators will be
damaged.
(m)
Lower the gauge against the piston plunger rod until the stem is fully compressed, then raise
the gauge approximately 0.250 inch.
(n)
Secure the thumbscrew to hold the gauge in position.
(o)
Rotate the crankshaft 2 or 3 degrees clockwise and counterclockwise to make sure the piston
is at TDC.
(p)
Loosen the setscrew (4, FIGURE 3-37) for the gauge dial and turn the dial so that the
indicator is at zero. Secure the setscrew.
NOTE
Each gauge for the timing tool has a total travel of 1.0 inch. One revolution of the indicator
needle equals 0.1 inch travel of the indicator stem.  When the stem of the gauge is
compressed, the indicator turns clockwise and the revolution counter turns counterclockwise.
Be sure to note the reading on the revolution counter at TDC. This will help you find 0.2032
inch Before Top Dead Center (BTDC).
(q)
Rotate the crankshaft in the direction of engine rotation (clockwise) to 90 degrees after Top
Dead Center (ATDC), (2, FIGURE 3-38). The piston travel plunger will be at the NH/NT 90
degree mark on the timing tool.
(r)
Loosen the thumbscrew (5, FIGURE 3-37) for the push rod travel gauge.
(s)
Move the gauge so that the stem of the gauge is in the center of the push rod
adapter.
(t)
Lower the gauge against the adapter until the stem is fully compressed. Then
raise the gauge approximately 0.025. inch.
(u)
Secure the thumbscrew (5) to hold the gauge in position.
(v)
Loosen the setscrew (4) for the gauge dial, turn the dial so that the indicator is
zero and secure the setscrew.
(w)
Rotate the crankshaft in the opposite direction of engine rotation, until you
reach TDC.
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