TM 9-2815-225-34&P 3-35.  CYLINDER HEAD AND VALVE REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection and Repair CAUTION Do not use disk sander to polish cylinder head.  Disk sander could cause serious damage to mating surface of head. 13.     Cylinder head (9) a.  Polish mating surface.   Use crocus cloth or orbital sander. Polish just enough to shine finish. This allows for a more complete inspection of mating surface. b.  Inspect for cracks, Discard cylinder head breaks, distortion, and assembly (1) if cylinder broken-out areas. head (9) is damaged. c.  Inspect for cracks using Discard cylinder head magnetic method. assembly (1) if any cracks are found. d.  Check for scratches or Use straightedge and feeler unevenness on mating surface. gauge.  Perform steps 13e through 13i if mating surface is scratched or uneven more than 0.002 in. (0.051 mm). e.  Resurface mating surface.    Do not remove more than 0.005 in. (0.127 mm) of material at one time.  Total amount of material removed must not exceed 0.040 in. (1.016 mm). f.  Inspect four valve inserts (12) Refer to steps 15a through 15e for and (15) for cracks, broken, or removal and installation.  Discard chipped areas.  Remove if damaged valve inserts (12) and damaged. (15). g.  Polish mating surface. Use crocus cloth or orbital sander. h.  Measure cylinder head (9) Use suitable vernier depth gauge. height. Discard cylinder head assembly (1) if cylinder head is less than wear limit shown below: Wear Limit  .................................................................... 4.340 in. (11.024 cm) New Minimum ................................................................ 4.370 in. (11.100 cm) New Maximum ............................................................... 4.380 in. (11.125 cm) i.  Remove two injector sleeves (7)   Refer to steps 18d and 18e. from cylinder head (9). 3-118