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b. Valve Mechanism Service.
(1) Operations not requiring cylinder head
removal:
(a) Adjustment of valve clearance (TM
10-3930-618-20).
(b) Replacement of valve push rods.
(c) Replacement of valve lifters.
(d) Replacement of valve springs.
(e) Replacement of any part of rocker
arm assembly.
(2) Cylinder head must be removed to
perform the following operations:
(a) Replacement of valves.
(b) Replacement of valve guides.
(c) Grinding or reseating valves.
(d) Replacement of valve seat inserts.
c. Rocker Arm Removal and Inspection. The
following operations may be performed without
removing the engine from truck, and if performed
in the truck disregard (1) below.
(1) Remove engine from truck (para 3-19).
(2) Remove rocker arm cover (3, fig. 3-30).
(3) Remove line assembly (5, fig. 3-37) from
cylinder head and rocker arm shaft (3).
Figure 3-36. Intake and exhaust valve assembly.
3-45
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