TM 9-2815-237-34 2-41.  ENGINE  ASSEMBLY  FROM  SUBASSEMBLIES  (Cont’d) f. Timing Chain and Drive Sprockets 1, 2. 3_< 4. 5. 6. 7. Install woodruff key (7) in camshaft (6) and woodruff key (8) in crankshaft (9). Install crankshaft sprocket (10) and camshaft sprocket (4) in timing chain (5) and align timing marks  (11). Rotate crankshaft (9) and camshaft (6) so woodruff keys (7) and (8) align with keyway slots in crankshaft  sprocket  (10)  and  camshaft  sprocket  (4). CAUTION Timing marks on crankshaft sprocket and camshaft sprocket must remain  aligned  after  installation  or  engine  damage  may  result. Install crankshaft sprocket (10), camshaft sprocket (4), and timing chain (5) as an assembly onto camshaft  (6)  and  crankshaft  (9). Install pump drive gear (3) on camshaft (6) with washer (2) and capscrew (1). Tighten capscrew (1) to 55-66 lb-ft (75-90 N•m). Apply OE/HDO to timing chain (5). NOTE Perform  step  7  only  if  timing  chain  was  replaced. Check timing chain deflection midway between camshaft sprocket (4) and crankshaft sprocket (10). Total  deflection  must  not  exceed  0.5  in.  (12.7  mm).  If  deflection  exceeds  specification,  inspect  cam- shaft sprocket (4) and crankshaft sprocket (10) for  damage. Replace either if damaged and recheck deflection. 2-164