TM 9-4940-568-34
7-18
7-4. CYLINDER HEAD REPAIR (CONT).
(10)
Install valve guides to dimension A thru D.
A = Lubricate with oil and press guides flush to bottom of bosses.
B = 0.4724 0.0295 in. (12.00 0.75 mm) diameter.
C = Trim off flush to top of guide bosses, if necessary.
D = 0.3161 0.0004 in. (8.029 0.010 mm).
Final bore after assembly is to be centered with valve
seats within 0.01378 in. (0.3500 mm) diameter and
square with combustion face within 0.004 in.
(0.10 mm) at 1.9685 in. (49.999 mm) radius.
NOTE
The following dimensions are for
(Thick wall) valve guides.
(11)
Machine cylinder head parent metal valve
guide bores to dimension “A”.
A = 0.5512 0.0005 in. (14.000 + 0.013 mm).
Bore is to be centered with valve seats within
(0.01378 in. (0.3500 mm) diameter and square with
combustion face within 0.004 in. (0.10 mm) at
1.9685 in. (49.999 mm) radius.
(12)
Install valve guides. Lubricate with oil and
press guides to dimension A protrusion
above cylinder head. Finish ream bores to
dimension “B”.
A = 0.4823 0.020 in. (12.250 0.51 mm).
B = 0.3161 0.0004 in. (8.029 0.010 mm).
