Crankshaft Magnetic Crack Inspection (1-07) Section 1 - Cylinder Block - Group 01 M11 Page 1-34 Open indications on the gear step diameter that enter the crankshaft keyway are not acceptable. Open indications that extend over the face of the crank- shaft or extend into the damper mounting capscrew holes are not acceptable. Subsurface indications cannot be seen with the naked eye after the magnetic particles have been removed. These are indications of open areas or foreign objects below the surface. Inspect for subsurface indications. Caution: All magnetism must be removed from thecrank- shaft completely and the crankshaft cleaned thoroughly. Small metal particles will cause engine damage.
Remove all magnetism from the crankshaft. The maximum residual magnetic field on any pin or main bearing journal is 8 gauss. NOTE: It can be necessary to use reverse D.C.-30 point step down equipment, or equivalent, to remove the magnetism.