TM 10-3930-669-20 VERIFY REPAIR (1) Start engine (TM 10-3930-669-10). (2) Listen and observe for excessive noise or vibration. (a) If engine is excessively noisy or vibrating, fault not corrected.   Perform Step (3) below.  Repeat procedure and notify Supervisor. (b) If engine is not excessively noisy or vibrating, fault corrected. (3) Shut down engine. 2-115