TM 10-3930-669-34 7.  ENGINE DOES NOT DEVELOP FULL POWER (CONT). KNOWN INFO Injection pump OK. Engine compression OK. POSSIBLE PROBLEMS Cylinder head(s) or gasket(s) faulty. Valves or valve springs faulty. TEST OPTIONS Visual inspection. REASON FOR QUESTION If cylinder head(s) or gasket(s) is faulty, engine will not run. 2-66 Replace cylinder head(s) or gasket(s) (Para 3-5).  Go to Step 5 of this Fault