TM 10-3930-669-34 1.  ENGINE CRANKS BUT WILL NOT RUN (CONT). 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 Piston crown clearance OK. If cylinder(s) is faulty, engine will not run. POSSIBLE PROBLEMS 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. Cylinders OK. If valves or valve springs are Piston crown clearance OK. faulty, engine will not run. POSSIBLE PROBLEMS Valve(s) or valve spring(s) faulty. Piston(s) faulty. Piston ring(s) faulty. Replace cylinder(s) or engine (Para 3-7 of 3-3). Go to Step 11 of this Fault. Replace valve(s) or valve spring(s) or cylinder head (Para 3-6 of 3-5).  Go to Step 11 of this Fault. 2-18