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 355 of 779
(2)
Specific
application
to
part
No.
10865297 cylinder (thick wall cylinder wit h
groove in periphery of mounting flange).
Th e
reflectoscope, search unit fixture, and maste r
checkin g
cylinde r
combination provides a
specific functional detection method. The pulse r
of the reflectoscope transmits short bursts, o r
pulses, of electrical energy through a cable to the
search unit fixture at which point these pulse s
are routed to the piezoelectric probe. The probe
changes the electrical pulses into ultrasoni c
energy and transmits them through the trans -
mitting medium (water) into and through th e
cylinder barrel wall, toward the outside diamete r
of the aluminum muff or crack, and back by the
same route to the probe. The probe then changes
the ultrasonic energy into electrical pulses which
are transmitted by cable back to the reflec -
toscope where a characteristic wave form i s
displaye d
in the screen. Additionally, th e
reflectoscope embodies an alarm system whic h
may be set to a specific level, to signal when the
crack or flaw is detected in the cylinder .
d. Detailer Calibration of the Cylinder Barre l
Tester .
(1)
General.
The following adjustment s
apply to a new tester. Once these adjustment s
have been made, they will seldom requir e
readjustment under normal conditions. Shoul d
the inspection procedure reveal an abnormall y
high cylinder reject rate, the tester adjustment s
should be checked to be certain the readings are
correct. However, it is good practice to check all
adjustments periodically to insure against ac -
cidental tampering. The reflectoscope cover and
search fixture probe protector should be in place
whenever the tester is not in use .
Note.
The cylinder barrel tester should no t
be operated in close proximity to electrica l
appliances, o r false alarming may result .
(2)
Establish
the
wave
form
on
the
reflectoscope display screen and set the alarm .
(a) Remove the cover from the reflec -
toscope .
(b) Plug the reflectoscope into a 115 volt
10 volt, 50 / 60 cycle single phase powe r
source. Turn the POWER (SCALE ILLUM )
knob clockwise and allow time for warm-u p
(approximately 10-15 minutes) .
(c) Adjust the sweep delay (upper lef t
hand control panel) .
(1)
Turn the SWEEP DELAY kno b
(red) clockwise to “1” .
(2)
Adjust the SWEEP DELAY kno b
(inner black) to adjust the initial pulse wave over
the left hand vertical division marker on th e
display screen .
(3)
Place the SWEEP toggle switch to
“PRESET" .
(4)
Plac e
the left hand INCH -
ES
/
DIV
lever
to
“2”,
and,
place
the
right
hand lever to “1” .
(5)
Turn the MARKERS knob (red )
counterclockwise to “OFF” .
(6)
Turn theALT. DISPLAY SHIF T
VERT screw fully counterclockwise .
(d) Pulser / receiver unit adjustment .
(1)
Plac e
the
TEST
switch
to
“NORMAL” .
(2)
Turn the FREQUENCY knob t o
“5.0” .
(3)
Place the SENSITIVITY switch t o
“X1“ and turn the SENSITIVITY control kno b
to “1” .
(4)
Turn the REJECT knob coun -
terclockwise to “OFF” .
(5)
Turn the PULSE LENGTH kno b
so that the dot is at the “12:00 o’clock” position.
(e) Display screen adjustment .
(1)
Tur n
the POWER (SCAL E
ILLUM) knob counterclockwise, but no t
“OFF” .
(2)
Place the GATE OFF switch t o
“GATE OFF” .
(3)
Adjust the VERT screw to plac e
the horizontal wave form line on the zer o
horizontal scale line (view A, fig. 53) .
6-61
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