72-30-04 CRANKSHAFT ULTRASONIC INSPECTION PROCEDURE.
Refer to Service Bulletin
CSB96-10,
or current revision.
A.
PURPOSE.
To provide a procedure for ultrasonic inspection of crankshaft intermediate
main bearing journal fillet areas.
B.
METHOD.
This procedure describes the use of a shear-wave, pulse-echo, angle-
beam ultrasonic inspection technique.
The sound enters at one end of the main bearing journal and propagates through the
steel at a
45" angle. The sound reaches the crankshaft center hole and is reflected
back up into the region of the fillet at the other end of the same journal.
If an ultrasonic reflector, in the form of a crack, exists in the region, the sound is
reflected back along the same path to the surface applied transducer, and displayed
as a signal on the screen of the inspection instrument.
In the absence of a reflector in the region into which the sound is directed, no signal is
displayed.
C.
EQUIPMENT.
1. Instrument. Krautkramer Branson Model USK 7D, USL
42,
USL 48, USN 50, USN
52 or
OR7S
2. Probe. Miniature Transducer Gamma Series 5
MHz
KrautkramerIBranson Cat.
#MSWS 224-580.
3. One each of the following reference standards:
PIN 654478-1
PIN 654483-1
PIN 654485-1
4. The following shear wave wedges are required:
PIN 654578
PIN 654484
5. Couplant. SAE 50 weight lubricating oil.
72-30-06 REVISED OCT 97
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