TM 10-3930-669-34 1.  ENGINE (CONT). KNOWN INFO TEST OPTIONS Injection pump OK. Injection pump timing check. POSSIBLE PROBLEMS REASON FOR QUESTION Injection pump timing incorrect. If injection pump timing is faulty, Camshaft gear alignment engine will not run. incorrect. Low engine compression. 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. REASON FOR QUESTION POSSIBLE PROBLEMS If camshaft alignment is Camshaft gear alignment incorrect, engine will not run. incorrect. Low engine compression. 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. Allign camshaft (Para 3-16).  Go to Step 11 of this Fault. Adjust Injection pump timing (Para 4-4).  Go to Step 11 of this Fault WARNING Read WARNING on Page 2-13 2-12