Camshaft - Magnetic Crack Inspection (1-18) Section 1 - Cylinder Block - Group 01 M11 Page 1-56 Subsurface indications - An indication is subsurface if, when wiped clean of magnetic particle bath, it cannot be seen with the naked eye in a well lighted area. Subsurface indications are often ‘‘voids’’ or ‘‘non-metallic inclusions’’ which are present in the raw material. Bearing Journal - Limits of Acceptance Do not use the camshaft if: More than four open indications in an axial direction on one of the bearing journals. More than one-half of the open indications extend more than half the distance across the bearing jour- nals. An open indication in a circumferential direction. NOTE:
The camshaft can be used if there are subsurface indications. Valve and Injector Lobe - Limits of Accep- tance Do not use the camshaft if there is: An indication in a circumferential direction. An indication in the black or shaded areas shown. An indication longer than 6 mm [0.250 inch]. An indication closer than 5 mm [0.188 inch] from the edge. More than two open indications on one of the lobes. Do not use the camshaft if: More than two indications are in the shaded area shown. An indication in the shaded area shown is longer than 16 mm [0.625 inch]. More than three indications are in the white area shown. An indication is in the black area on the injector lobe (1).
More than two indications are in the black area on the valve lobe (2). An indication in the black area on the valve lobe is longer than 3 mm [0.125 inch].