TM 10-3930-660-34 3-7. CYLINDER HEAD ASSEMBLY - REPLACE/REPAIR (Cont’d) NOTE If warpage, uneven surfaces, or distortion are found, cylinder head assembly must be replaced. 2 INSPECT VALVES. GRIND ALL REUSED VALVES.  MARK NEW VALVES RESPECTIVE TO THEIR LOCATION IN THE CYLINDER HEAD. a. Inspect valve stems for scratches or scuff marks. b. Inspect valve faces for ridges, cracks,or pitting. c. Check valve stem tip for flatness and replace valve if necessary. NOTE If a new valve is required, mark replacement location on the valve. 3. MEASURE VALVE STEM DIAMETER. MINIMUM ALLOWABLE DIAMETER IS 0.3126 INCH. MARK NEW VALVES RESPECTIVE TO THEIR LOCATION IN THE CYLINDER HEAD. NOTE If a new valve is required, mark replacement location on the valve. Measured Area Variation Limit Any 2 inch dia. area 0.004 in. Overall end-to-end 0.003 in. Overall side-to-side 0.003 in. 3-39