ARMY TM 9-6115-670-14&P
6-7
c. Inspect cylinder head for flaws.
(1) Clean cylinder head ensuring that all dirt, grease, and water are removed.
(2) Apply penetrant to cylinder head making sure to cover the entire surface of cylinder head.
(3) Wait about ten minutes before proceeding to allow penetrant sufficient time to penetrate
any flaws that may exist.
(4) Remove penetrant with penetrant remover.
(5) Apply a thin, uniform layer of developer. If flaws exist, they will become apparent when
developer is applied.
(6) If flaws exist on cylinder head, replace cylinder head.
d. Test valve recessing.
(1) Clean cylinder head, valve face, and valve seat.
(2) Insert valve into the valve guide.
(3) Use depth gauge (1, sheet 2) to measure valve recessing. The valve recessing should be
between -0.0039 in. (-0.10 mm) and -0.0039 in. (-0.10 mm).
(4) If valve recessing exceeds tolerance, replace valve (para 6.7.).
(5) Test valve recessing again. If recessing still exceeds allowable limit, adjust the valve seat
(para 6.10.).
(6) Test valve recessing a final time. If recessing continues to exceed allowable limit, repair
cylinder head.
REPAIR
Refinish cylinder head within tolerance (step b, TEST).
