Section 2 - Cylinder Head - Group 02 Valve Crosshead - Magnetic Crack Inspection (2-12) M11 Page 2-35 Magnetize the crosshead and inspect it with residual magnaglo. Cracks will be indicated by a bright line. The primary location for cracks will be the valve stem pocket area. If cracks are found, the crosshead must be replaced. Remove all magnetism. Use solvent to clean the crossheads. Dry with compressed air.