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TM 55-1905-223-24-1
d.
Check for possible cracks using magnaglo tester.
NOTE
The gear and shaft retaining plate must be removed before performing this check.
(1)
Set up magnaglo tester for head shot method using instructions provided on tester. Adjust
test to 2000 ampere dc or rectified ac (FIG. 4-62a).
(2)
Apply wet bath solution to area being checked. Do not wet more than 1/3 of the camshaft at
a time. Continually wet the area while applying voltage from the tester.
(3)
Use black light supplied with tester to check camshaft for cracks.
(4)
Set up magnaglo tester for coil shot method. Use the 12 in h (305 mm) coil supplied with the
c
tester.
NOTE
An ampere turn is an electrical current of one ampere flowing through the coil
multiplied by the number of turns in the coil.
(5)
Apply coil shot of amperage (ampere turns) between 3600 and 4000 dc or rectified ac
(FIG. 4-62b). Continuously wet area with solution.
(6)
Check the camshaft for cracks using blacklight.
(7)
Do not use camshaft if there is any of the following indications on the bearing journals:
four open indications in an axial direction on one of the bearing journals,
more than 1/2 of the open indications extend more than 1/2 the distance across the bearing
journals,
an open indication in a circumferential direction.
NOTE
An open indication is visible to the eye after the wetting operation has been
completed. An indication below the surface is not visible to the eye after the
wetting operation has been completed. An indication below the surface can be
seen with the use of an ultraviolet light.
(8)
Do not use the camshaft if there is any of the following open indications:
indication in a circumferential direction,
indication in the black or shaded areas shown in FIG. 4-63.
indication longer than 1/4 inch (6 mm).
4-61


 


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