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

  TM-9-2815-200-35 - Page 266 of 779

Note.
Before removing cylinder assemblies, it
will be necessary to check the breaking torque of
the 14 nuts attaching each cylinder assembly to
crankcase assembly. This check is necessary to
determine whether base nut stud has stretched.
All stretched studs must be replaced.
1. Check breaking torque of the 14
nuts (B)
securing
cylinder assembly to crankcase assembly using box
wrench
in
combination
with
torque wrench.
When torque
required to break a nut
loose is less than 600 pound inches, remove nut, apply
antiseize compound
FSN
9150-663-1770 to stud,
install nut and tighten to a torque of 600 to 660 pound
inches.
When nut does not tighten to the recommended
torque, stud is stretching and must be replaced, Mark
stud for replacement. Refer to paragraph
6-4e for
instructions on replacement of studs.
2. After checking the breaking torque, remove all nuts
(B) except one on each side of cylinder. The remaining
two nuts are removed after piston has been positioned
to top dead center for removal (fig. 5-144).
Figure 5-143. Checking breaking torque of
cylinder base nuts, using box
Note. Before removing each cylinde r
assembly, the crankshaft must be turned to
position the piston of the cylinder being removed
to top dead renter. Rotate crankshaft using
splined
wrench
(fig.
5-91)
and
observe when (connecting rod has raised piston to
top dead center. Make certain each piston is
properly positioned before attempting cylinder
removal.
1.
With
right bank cylinder assemblies in a vertical
(upright) position remove the remaining two
nuts (A)
from each right cylinder assembly. Make certain each
piston is positioned at top dead center before at-
tempting removal.
2. Do not remove the nuts (B) holding the left cylinder
assemblies to crankcase until left cylinders have been
rotated to an upright position for removal.
Figure 5-144. Right bank cylinders in vertical
position for removing or installing
cylinders from crankcase.
5-80


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