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 549 of 779
(7) Add oil as required to bring oil in oil pan
to full level as indicated on oil level gage,
carefully measuring amount added.
(8) Maximum allowable oil consumption at
2400 rpm, with SAE 30 oil, is 0.0075 pounds
per brake horsepower hour (lbs / bhp / hr).
g. Checking Exhaust Gas Temperature.
Pip e
plugs (4, fig. B-12) are provided in exhaust
manifold elbows for installation of ther -
mocouples to measure exhaust gas temperatures
(para 8-1f). Variations of temperatures between
cylinders should not exceed 150°F. Check fuel
injector nozzles of cylinders that exceed this
variation.
h. Lubricating Oil Pressure Outlets .
Lubricating oil pressure outlets are provided in
the main and piston oiler nozzle gallery lines for
installation of pressure sensing gages to measure
the engines oil pressures (para 8-1i, (1) and (2)).
i. Induction Air Temperature.
An outlet is
provided in the bottom of the intake manifold,
on each side of the engine, for installation of
thermocouples to measure induction air tem-
perature (para 8-1j).
j. Manifold Pressure.
An outlet is provided in
the intake manifold elbows, on each side of the
engine, for installation of a manometer gage
and / or connection (para 8-11).
Table 8-1. Overhaul Test Schedule-Beam Length.
..1.75 Ft.
(or 21.008 in.)
Run No.
Time Min.
RPM
Scale limits
Obs. BHP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
10
700
Warm-up
15
1000
16.0
16.0
15
1400
83.5
116.9
20
1800
159.5
287.1
20
2200
195.0
429.0
20
2400
208.0
499.2
30
2400
229.0
549.6
Torque Lh-Ft.
8 4
438
837
1024
1092
1202
F.R. - F.L.
30
2400
F.R. - F.L.
F.R. - F.L.
Check for low idle at 675 to 725 rpm. Adjust if necessary.
Check oil filter and inspect for oil and fuel leaks.
5
2200
F.R. - F.L.
5
2000
F.R. - F.L.
5
1800
F.R. - F.L.
Check governor high idle speed. This shall not exceed 2640 rpm ,
(No-Load, water off). If adjustment is required, recheck horsepowe r
at 2400 full load .
Borescope cylinders (para 8-6), check for fuel and oil leaks, prepare
engine for removal from stand .
Note.
Run numbers 1 through 8, and 1 1
through 14, shall equal three hours. Sequence of
operations may be varied.
8-6. Inspection of Cylinders for Scuffing
a.
General .
(1) As used in this publication, cylinder wall
“scuffing”
is defined as a streak or streaks,
running the length of the piston ring travel, on
the cylinder wall, which are greater than 1 / 4
inch wide and which reveal a high gloss or polish
where the cylinder wall honing pattern has been
completely worn away.
(2) Scuffing is caused by excessive localized
heat on the contact face of the piston ring and
cylinder bore. The excessive heat is due to a
breakdown of the oil lubricating film and is the
result of one or more conditions such as ;
abrasives in the oil or induction air, lack of or
improper honing, defective piston ring, etc. The
heat and pressures involved during the scuffing
process will flow or smear the cylinder wall metal
and destroy the honing pattern. The process in
general generates additional heat due to friction
and in many cases the scuffing will progress or
the width of the afflicted area will grow and may
envelope the entire cylinder bore. Scuffing is
detrimental to the engine, since oil consumption
and blow-by gases can no longer be controlled.
b. Borescope Inspection.
(1) After completion of dynamometer in-
spection,
all overhauled engines
shall hav e
cylinders inspected by borescope as follows:
8- 7
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