TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 357 of 779
(4)
Adjust the INTENSITY scre w
clockwise to brighten the wave form, but not to
the point where a bright spot occurs at the
beginning of the wave form.
Caution:
Too much intensity ca n
damage display screen phosphor coating.
(5)
Adjust the ASTIG screw to the
sharpest wave form.
(6)
Adjust the FOCUS screw to the
sharpest wave form.
(3)
Adjust the reflectoscope using th e
master checking gage.
(a) Pour water into the master checking
gage, part No. 10935515, to the “FILL” level
(five inches from top). Place the marked defect
portion of the gage facing the operator.
Note.
Fresh water should not be used for
test. Allow the water to stand twenty-four hours
before use. Add approximately one fluid ounce of
anti-coalescent agent, such as “Jet Dry”, to each
ten gallons (37.85 liters) of water. The water,
master gage, and test cylinders should be at room
temperature during test.
Note.
Wipe all air bubbles from th e
cylinder wall. Bubbles may cause a false alarm
signal.
(b) Remove the protector from search
fixture probe. Place the search fixture on the
master checking gage (fig. 6-54), with th e
UPPER-LOWER switch facing the operator .
Place
the search fixture UPPER-LOWE R
switch to “UPPER” .
Figure
6-54.
Ultrasonic search fixture
installed on master checking cylinder.
(c) Connect the cable to the search fix-
ture, and to the reflectoscope at connector “R”.
(d) Rotate the search fixture handl e
counterclockwise to move the probe to th e
uppermost position. The wave form on th e
display screen will be similar to view B, fig. 6-53.
(e) Rotate the search fixture handl e
clockwise to move the probe downward. Rotate
the search fixture handle until the echo pulse, or
spike (view C, fig. 6-53), is shown on the display
screen when the fixture pointer alines with the
master checking gage defect.
(f) Move the search fixture probe upward
and downward until a maximum pulse is ob-
tained on the display screen (view C, fig. 6-53).
(g) Adjust the PULSE TUNING kno b
(on pulser / receiver unit) to obtain th e
maximum pulse height on the display screen.
(h) Adjust the SENSITIVITY contro l
knob (on pulser / receiver unit) to provide an
echo pulse height of 2-1 / 2 inches (view C, fig.
6-53).
(i) Place the search fixture UPPER -
LOWER switch to “LOWER” .
6-63
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