TM 5-6115-434-12
Table 3-5. Sequence of events during performance check-Continued
Step
Condition
Power unit Indication
Adaptor indication
Remarks
8
Engine continues
Control air pressure
If not, control air line
acceleration.
increases as follows:
leak, clogged control
Approximately 2 psig
air pickup orifice,
at 25 percent gov-
or faulty accelera-
erned speed, approxi-
tion thermostat.
mately 8 psig at 50
Place finger over fuel
percent governed
control drain outlet,
speed, approximately
if control air pressure
32 psig at 100 per-
increases, accelera-
cent governed speed.
tion limiter valve
diaphragm failed.
Fuel Pressure increases.
If not, insufficient
fuel supply or fuel
control malfunction.
Exhaust Gas Temperature If temperature drops
increases.
off to less than 200°C
(392°F) fuel atom-
izer may be clogged.
If temperature re-
mains high but en-
gine does not ac-
celerate, generator
or other accessory
may have failed.
Compressor or Tur-
bine rub or plenum
air leak, starter
failure or low charged
batteries.
Engine oil pressure
reaches approximately
45 psig.
Low oil pressure switch
No indication.
If not, engine will
actuates.
shut down at 95 per-
cent governed speed.
10
Engine reaches
K4 time delay and
If not, centrifugal
35 percent
starter lamps extin-
multi-speed switch
governed speed
guish.
assembly 35 percent
switch failed.
Start relay (K1) de-
DC voltage increases
If not, start relay (K1)
actuates and start
stuck closed.
motor de-actuates.
11
Engine reaches
Centrifugal multi-speed
95 percent
switch assembly 95
governed
percent switch ac-
speed.
tuates.
Ready to load lamp
Ready to load and K6
If not, centrifugal
illuminates.
under frequency
multi-speed switch
lamps illuminate.
assembly 95 percent
switch failed.
Ignition unit de-ener-
Ignition lamp extin-
gized.
guishes.
Hourmeter activated.
If not, circuit breaker
(CB-4) tripped, or
hourmeter failed.
3-25
