TM 10-3930-669-34 CAUTION Engine  idle  speed  must  be  checked  prior  to  performing  power  test.    If  idle  speed  is  not  within limits specified for vehicle: • Adjust idle speed to be within proper limits. • Do not run power test if idle speed cannot be properly adjusted. • To prevent damage to equipment, allow engine to idle at least two minutes after performing power test. . 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. VERIFY REPAIR (1) Start engine (TM 10-3930-669-10). (2) Operate forklift with a standard load and observe operation. (a) If  engine  does  not  develop  full  power,  fault not  corrected.    Perform  Step  (3)  below  and notify supervisor. (b) If engine develops full power, fault corrected. Perform Step (3) below. (3) Shut down engine 2-69