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 513 of 779
CHAPTER 7
ASSEMBLY OF ENGIN E
Section I. GENERA L
7-1.
Cleanlines s
The engine is a precision product and extreme
care and cleanliness must be exercised in al l
phases of assembly operations t o
insur e
satisfactory engine performance. Dirt and dust ,
even in minute quantities, are abrasive. Afte r
cleaning and just before assembly, coat al l
bearings, shafts ,
and contact surfaces wit h
engine
oil
(OE).
This
will
insure
sufficien t
lubrication of moving parts when first put into
operation .
7-2. General Assembly Instruction s
a. Gaskets.
Always use new gaskets whe n
assembling the engine. Use new preforme d
packings and annular copper gaskets throughou t
engine assembly. An engine overhaul parts ki t
2815-678-4245, consisting of all necessar y
gaskets and preformed packings, is available fo r
use during engine overhaul .
b. Kits and Sets.
Several of the components o f
the engine are available in kits or sets. Whenever
a kit or set is used for parts replacement, al l
components of the kit or set should be installed,
except for the auxiliary oil filter parts kit, FS N
2940-884-4801. This kit is the universal type .
Refer to Appendix for specific information .
c. Attaching Parts.
When torque tightenin g
nuts ,
bolts,
and
screws,
and
a
torque
specification
is
no t
noted
in
the
text
or
illustration covering the installation, it is un -
derstood that the standard torque values i n
paragraph 6-7 prevail. Whenever a nut, bolt, o r
screw requires that special attention be given, the
torque
value
will
be
noted
in
the
text
or
illustration pertaining to that operation. Torque
wrench readings are of no value, unless properly
used. It must be understood that it is not th e
force necessary to turn the nut, bolt, or scre w
that is important, but the resultant pull on the
part that completes the union. Therefore ,
resistance of the nut to turning must be kept to a
minimum .
Threads must be clean and un -
damaged, and lubricated with antiseize com -
pound FSN 9150-663-1770 to reduce th e
friction .
Note.
When using a torque wrench, the fina l
reading must be taken while the nut, cap screw ,
or bolt is turning. When torque reading is close
to that specified when wrench is at the end of its
swing, back off the nut slightly and chang e
wrench position; then pull to the desired reading
while the nut is turning. To start a partiall y
tightened nut will require a much higher torque
than that required to keep a nut turning. Th e
ratio of pounds-torque to pounds-pull on a bolt is
not an even ratio and excess torque may easily
overstress the bolt. Under-torquing bolts an d
studs subject to cyclic loads such as cylinder base
studs and connecting rod bolts will result i n
fatigue failures. It is therefore important that the
torque values specified in this manual b e
followed to avoid failures of fasteners .
Note.
Do not exceed torque specified .
d. Lock Nuts, Tab Washers, Locking Wire ,
Lock Washers, and Cotter Pins.
All bolts an d
nuts should be secured with lock nuts, ta b
washers, locking wire ,
lockwashers, or cotte r
pins, as specified. Many engine failures hav e
been traced to neglect of this simple precaution.
7-3.
Installation Instruction s
Note.
References to figures in this Chapte r
are listed in the reverse order of disassembly both
in text and tables, which is the sequence required
to accomplish reassembly of the engine; i.e., 5 -
24 through 5-11 .
Usually the step-by-step procedure to b e
followed for installing subassemblies on th e
engine are given immediately following th e
removal procedure in Chapter 5. This method o f
installation will be used throughout this chapte r
unless otherwise indicated in the contents table
immediately following each paragraph. Eac h
contents table lists engine components, grouped
in proper assembly order, and the appropriat e
paragraph reference and / or figure reference for
installation procedures .
7-1
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