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 348 of 779
b. Value Rocker Arm Covers.
Refer t o
paragraph
4-14 .
6-30. Cleaning.
a.
Clean cylinder and associated parts, and
remove heavy carbon deposits from combustion
chamber with a scraper or blunt tool which will
not nick or scratch the surface, Remove only the
heavy carbon deposits. Surface need not be
cleaned to a mirror finish.
b.
Clean carbon from fuel injector nozzle seat
using nozzle carbon cutter - 4910-795-7958 as
shown in figure 6-50.
Figure 6-50. Clean ing carbon deposits from
fuel injector nozzle seal using nozzle carbon
cutter - 4910-795-7958.
c.
Soak cylinder in carbon removing com-
pound to remove carbon and other foreig n
material from dome, valve ports, and the area
between the top of the barrel and the head
casting.
6-31. Inspection
a. Valve Guides.
Inspect valve guides (14 and
37, fig. B-4), for cracks, galling, erosion, or
scuffing. Check guides for secure fit in cylinder.
Check guides against limits specified in the
overhaul standards (table 6-15).
Note.
Do not remove valve guides unless
replacement is necessary.
b. Valve Seat Inserts.
Check valve seat inserts
for secure fit in the cylinder (41, fig. B-4). In-
serts must have tight fit. Inspect inserts for
burned or pitted surfaces. Check valve sea t
contact by lightly bluing face of insert with
Prussian blue - 8010-247-8706 and placing a
new valve into position on valve insert. Rotate
valve one-half turn on insert and check valve seat
for Prussian blue contact. Valve seat must show
perfect contact, as indicated by Prussian blue
transfer, to qualify as a serviceable insert. Inserts
that do not show perfect contact must be marked
for repair.
If inserts are cracked, loose, or
damaged beyond repair, the cylinder must be
replaced.
If valve seat inserts can be made
serviceable by grinding; repair as outlined in-
paragraph 6-33a(2). Check the inserts against
limits specified in overhaul standards (table 6-
15).
c. Cylinder.
Two types of cylinders have been
used on the ADVS-1790 series engines. The
latest type cylinder has a wall thickness in-
creased by 0.030 inch to provide greater
strength. These cylinders can be identified by a
machined groove
on the cylinder mounting
flange periphery, refer to figure 6-51.
6-54
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