TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 368 of 779
faces. Discard valves having badly pitted ,
scored, scratched stems or locking grooves.
(b) Reface slightly pitted or burned
valves that do not seat perfectly to limit s
specified in figure 6-63. Discard valves that
cannot be refaced to these limits.
(c) Check valve length from seat contact
to tip of stem after grinding, as shown in figure 6-
63. Discard valve if length is not within limits
specified (fig. 6-63).
(2)
Valve springs.
Replace springs (16, 17,
and 18) when worn, cracked, or otherwis e
dam aged. Replace springs that do not conform
to limits specified in overhaul standards (table 6-
15).
(3)
Valve spring retainers, valve rotors, and
valve locks.
(Refer to fig. B-4)
(a) Replace upper intake and exhaus t
valve spring retainers (19 and 38) and valve
spring seat (15) when cracked or worn.
(b) Replace valve rotors (40) when inner
section does not rotate freely or when assembly is
worn or cracked.
(c) Replace valve locks (20) when worn
or cracked.
6-34. Assembly
a. Cylinders.
(Refer to fig. B-4)
(1) Install intake valve (12) and exhaust
valve (11) in their respective guides in cylinder
(41). Hold valves in position and place the
cylinder on valve removing and inserting stand -
4910-554-1317 following instructions which
accompany figure 6-65.
1. Position the valve lifter assembly - 5120-678-5285
over the valve springs and retainers (A) and secure in
position with four 5 / 16 x 1-3/8 bolts and 5 / 16-in.
flat washers.
2. Compress valve springs and retainers with screws (B)
and install two valve locks (20) in the groove of each
valve stem. Release valve spring compression. Remove
valve lifter assembly - 5120-678-5285 from cylinder
and remove cylinder from stand.
Figure 6-65. Co repressing valve springs
using valve lifter assembly-5120-678-5285.
(2)
Install the exhaust valve rotor (40),
outer, intermediate, and inner springs (16, 17,
and 18), and upper exhaust valve spring retainer
(38) over the exhaust valve stem as shown in
figure 6-49. Install the lower intake valve spring
seat (15), outer, intermediate, and inner springs
(16, 17, and 18), and upper intake valve spring
retainer (19) over the intake valve stem in the
same manner. Compress valve springs an d
install valve locks following instructions which
accompany figure 6-65.
b. Valve Rocker Arm Covers.
Refer t o
paragraph 4-14.
6-7 4
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