A
TM 9-4940-568-34
7-17
(7)
Measure valve guide bore. Minimum
diameter is 0.3157 in. (8.019 mm) and
maximum diameter is 0.3185 in. (8.090
mm).
(8)
If valve guide bores are found to be worn
during inspection, cylinder head must be
machined for service valve guides. Valve
guides must be finished-reamed after
installation into head.
NOTE
If, after inspection, it is
determined that service valve
guides and valve inserts are
required, install service valve
guides first.
Valve Guide Part No.
3904408 – Intake (Thick wall)
3904409 – Exhaust (Thick wall)
3906206 – Intake and Exhaust (Thin wall)
NOTE
The following dimensions are for
(Thin wall) valve guides.
(9)
Machine cylinder head parent metal valve
guide bores to dimension “A”.
A = 0.4380 0.0005 in. (11.125 0.013 mm) diameter.
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.
