TM 10-3930-669-34 VISUAL INSPECTION Remove and inspect suspect cylinder(s) (Para 3-7). (a) If cylinder(s) is cracked or fractured, cylinder(s)  is  faulty.    Replace  cylinder(s)  or engine (Para 3-7 or 3-3). (b) If  cylinders  are  not  damaged,  cylinders  are OK. VISUAL INSPECTION (1) Remove valves from suspect cylinder head(s) para 3-6). (2) Inspect valves and springs for damage. (a) If    valve(s)    and/or    spring(s)    is    damaged, replace  valve(s)  and/or  spring(s)  or  cylinder head(s) (Para 3-6 or 3-5). (b) If    valves    and    springs    are    not    damaged, valves and springs are OK. 2-19