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 346 of 779

6-29. Disassembly

a. Cylinder.

Disassemble cylinder assembly

following instructions which accompany figures

6-47 through 6-49.

Note.

The 12 rocker arm cover assemblies are

machined with cylinder assemblies as matched

units. The covers are stamped with matching

numbers (fig.

5-105) to correspond with th e

number stamped on the cylinder. Keep covers

with their respective cylinders.

1. Place cylinder with valves, springs, and retainers on

removing and inserting valve stand - 4910-554-1317

(A).

2. Secure valve lifter assembly - 5120-678-5285 to the

cylinder head with four bolts (B) and flat washers.

Figure 6-47. Cylinder showing position of

valve

lifter assembly - 5120-678-5285 and

removing and inserting valve stand -

Warning :

The valves and locks are under

heavy spring tension.

Exercise extreme care

when removing locks, retainers and springs.

1. Compress exhaust valve spring and upper retainer.

2. Remove two valve locks (A) from the groove in valve

stem. Tap valve spring retainers to free locks. Carefully

loosen lifter screw to release valve springs.

3. Remove intake valve spring upper retainer locks (B)

in the same manner.

4. Remove lifter assembly (C).

Figure 6-48. Compressing exhaust valve

springs to remove or install upper valve

spring retainer and locks.

6-52