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 341 of 779
Section V. OVERHAUL OF PISTONS, RINGS, AND PISTON PINS
6-22. General
Overhaul standards of individual components
This section covers the overhaul of the pistons,
follow the inspection components. Refer to the
following table (table 6-12) for applicabl e
rings, and piston pins. Specific instructions on
disassembly, cleaning, inspection, repair, and
illustrations
an d
instructions for overhau l
operations.
assembly accompany the overhaul operations.
Table 6-12. Pistons, Rings, and Piston Pins
Component
Disassembly
Cleaning
Inspection
Repair
Assembly
Piston
Para 6-23
Para 6-24
Para 6-25a
Para 6-26a
Para 6-27
Figs. 6-44
Table 6-13
Figs. 6-46
and 6-45
Piston Rings
through 6-44
Para 6-25b
Para 6-26b
Table 6-13
Piston Pins
Para 6-24
Para 6-25c
Para 6-26c
Table 6-13
6-23.
Disassembly
a.
Pistons.
Disassemble pistons following
instructions which accompany figures 6-44 and
6-45.
Note. Before removing compression rings and
oil control ring, check to see if they are free in
piston grooves.
Mark ring grooves of sticking
rings for further detailed inspection.
1. Place jaws of remover and replacer - 5120-795-0177
in the end gap of upper piston ring (A). Spread ring, lift
out of groove, and remove from piston. Discard piston
ring.
2. Remove and discard two intermediate compression
rings (B) and oil control ring in the same manner.
Figure 6-44. Removing or installing piston
compression rings using remover
and replacer-5120-795-0177 .
Remove
1. Remove oil control piston ring expander spring (A) by
separating at parting line as shown. Discard spring.
Install
1. Install new oil control ring expander spring (A) in oil
control groove of piston and join ends of spring together
as shown.
Figure 6-45. Removing or installing oil
control piston ring expander spring.
6-47
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