TM-9-2815-205-24 Technical Manual for M113 Engine 6V53 6V53T Download
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REPAIR OR REPLACEMENT - Continued (3) Grind top surface of valve seat with 15 degree grinding wheel to narrow seat width to dimensions shown. Adjust the 31 degree face (Figure 13, Item 76) relative to center of valve face (Figure 13, Item 75) using 15 and 60 degree grinding wheels. NOTE Grinding will reduce thickness of valve seat and cause valve to recede into cylinder head. Replace valve seat if valve recedes beyond limits. (4) After grinding is completed, clean valve seat thoroughly. Measure concentricity of valve seat in relation to valve guide. If runout exceeds 0.002 inch (0.05 mm), check for bent or worn valve guide before regrinding valve seat. 0.047–0.078 in. (1.19–1.98 mm) 0.220–0.224 in. (5.59–5.69 mm) 0.031 in. (0.79 mm) MINIMUM 75 76 MAINT_259 Figure 13. Cylinder Head Valve Seat Centricity Measurement. TM 9-2815-205-24 0083 0083-16