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 343 of 779
Table 6-13. Pistons, Piston Rings and Piston Pins overhaul Standards
Fig.
Component
No.
—
Piston
B-4
B-4
B-4
B-4
B-4
B-4
Piston Pins B-4
B-4
B-4
B-4
B-4
Piston Rings B-4
B-4
B-4
B-4
B-4
B-4
B-4
B-4
B-4
Piston Rings B-4
B-4
B-4
Ref.
letter
QQ
K K
L L
M M
N N
J
J-H
G
F-G
C C
E E
LL-
E E
D D
G G
MM -
G G
F F
J J
NN -
J J
H H
L
00- L
Point of measurement
Diameter at bottom of skirt 90 degrees to
piston pin
Diameter of top groove in piston (measured
over 0.11547 dia. pins)
Inside width of top intermediate groove in
piston
Inside width of lower intermediate groove in
piston
Inside width of oil control ring groove in piston
Inside diameter of piston pin bore in piston
Outside diameter of piston pin
Fit of piston pin in Piston
Outside diameter of piston pin plugs
Inside diameter of bore in piston pin
Fit of piston pin plug in piston pin
Gap clearance of top compression ring when
fitted in gage
Outside width of top intermediate compression
ring
Clearance between ring and piston
Gap clearance of ring when fitted in gage
Outaide width of lower compression ring
Clearance between ring and piston
Gap clearance of ring when fitted in gage
Outaide width of oil control ring
Clearance between ring and piston
Gap clearance of ring when fitted in gage
Cylinder bore diameter measured up 2.250
inches from bottom of cylinder skirt
Fit of piston in cylinder bore, measured up
Sizes and fits
of new parts
5.7415
5.7425
5.7380
5.7480
0.0990
0.1000
0.0980
0.0990
0.1880
0.1890
2.0018
2.0020
2.0000
2.0002
0.0016L
0.0020L
0.9975
0.9985
0.9995
1.0005
0.0010L
0.0030L
0.0500
0.0600
0.0925
0.0935
0.0055L
0.00075L
0.0500
0.0600
0.0925
0.0935
0.0045L 0.0065 L
0.0500
0.0600
0.1850
0.1865
0.0015L
0.0040L
0.0300
0.0500
5.7510
5.7530
0.0075L
0.0115L
Wear limits
5.7385 to 5.7435
5.7280
0.1035
0.1025
0.1910
2.0012 to 2.0030
1.9998
0.0006L: to 0.0032L
*
*
*
*
*
0.0110L
*
*
0.0100L
*
*
0.0060L
*
5.7600
0.0215L
2.250 inches from bottom of cylinder skirt,
90 degrees to piston pin
Note.
Refer to paragraph 6-3b for explanation of symbols.
6-49
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