TM 10-3930-669-34 1.  ENGINE (CONT). KNOWN INFO TEST OPTIONS Injection pump OK Visual inspection. Injection pump timing OK. Camshaft gear alignment OK. REASON FOR QUESTION Engine compression OK. If cylinder head(s) or gasket(s) POSSIBLE PROBLEMS Is faulty, engine will not run. Cylinder head(s) or gasket(s) faulty. Piston crown clearance incorrect. Cylinder(s) faulty. Valve(s) or valve spring(s) faulty. Piston(s) faulty. Piston ring(s) faulty. KNOWN INFO TEST OPTIONS Injection pump OK. Visual inspection. Injection pump timing OK. Camshaft gear alignment OK REASON FOR QUESTION Engine compression OK. Cylinder heads and gaskets OK. If piston crown clearance is incorrect, engine will not run. POSSIBLE PROBLEMS Piston crown clearance incorrect. Piston(s) faulty. Cylinder(s) faulty. Valve(s) or valve spring(s) faulty. Piston(s) faulty. Piston ring(s) faulty. 2-16 Replace cylinder head(s) or gasket(s) (Para 3-5).  Got  to Step 11 of this Fault. Adjust cylinder (Para 3-7).  Go to Step 11 of this Fault.