TM 10-3930-669-34 VISUAL INSPECTION (1) Remove intake and exhaust manifolds (Para 4- 2 and 5-2). (2) Check  inside  of  exhaust  manifolds  for  leaking oil. (a) If there is oil present inside the exhaust manifolds, go to Step (3) below. (b) If   there   is   no   oil   inside   the   exhaust manifold, go to Step 4 of this Fault. (3) Remove cylinder head (Para 3-5). (4) Check cylinder head, valve, valve guides, and seals for cracks and damage. (a) If cylinder head components are damaged, replace engine (Para 3-3). (b) If   cylinder   head   components   are   not damaged, components are OK. VISUAL INSPECTION (1) Check   for   oil   leakage   past   cylinder   ports   or piston rings. (a)  If   oil   is   leaking   past   cylinder   ports   or piston rings, replace engine (Para 3-3). (b) If oil is not leaking past cylinder ports or piston rings, perform Step (2) below and go to Step 4 of this Fault. (2)  Install intake and exhaust manifolds (Para 4-2 and 5-2). 2-35