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 159 of 779
Remove
Note.
All valve rocker arm covers are removed
in the same manner .
1. Separate intercylinder connector flanges (A) from
valve rocker arm cover.
Note.
Use a piece of shim stock to loose n
flanges of intercylinder preformed hose .
Caution;
Do not damage sealing surface o n
flange of intercylinder preformed hose as it wil l
cause oil leaks and replacement of hose will be
required .
2. Remove four bolts (B) and flat washers.
3. Remove seven bolts (C) and flat washers.
4. Remove two screws (D) and flat washers.
Note.
Before removing rocker arm cover bolt s
(E), instruction 5, below, the tension on th e
valve rocker arms, caused by the valve springs .
must be released. Turn engine, figure 4-51, unti l
valve rocker arm rollers are on camshaft bas e
circle, or until both valves are closed, to relieve
spring tension before removing cover. Chec k
rocker arms to see that they move up and down.
If movement (clearance) cannot be felt, tur n
engine until clearance is evident. When clearance
is obtained between both adjusting screw pad s
and valve stems, the rocker arm rollers are on the
camshaft base circle, and the valves are com -
pletely closed .
5. Remove four bolts (E) and packings with retainer and
remove valve rocker arm cover.
Install
Note.
The cylinder and valve rocker arm cover
are machined as an assembly. The number o n
the rocker cover must be kept with its matin g
number on cylinder to insure camshaft bearin g
alinement and running clearance .
Note.
The bolts and screws securing valv e
rocker arm cover to cylinder must be torque d
carefully to prevent stripping of heli-coil inserts.
1. Position valve rocker arm cover on cylinder and install
four bolts (E) and packings with retainer and tighten to
275-325 pounds inch torque.
2. Install two screws (D) and flat washers and tighten to
100 pounds inch torque.
3. Install seven bolts (C) and flat washers and tighten to
100 pounds-inch torque.
4. Install four bolts (B) and flat washers and tighten to
100 pounds inch torque.
5. Position intercylinder connector flanges (A) on valve
rocker arm cover.
Figure 4-157. Removing or installing valv e
rocker arm cover bolts and removing valv e
rocker arm cover .
4-77
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