OPENING
PRESSURE
The correct opening pressure should be 21 00-2200
psi
(14480-15169
kPa)
for
new
nozzles.
It
may
be
about
200
psi (1380 kPa) less after the nozzles have
operated a few hundred hours. Open pressure gauge
to obtain reading.
Leakage Test
1.
Slowly depress hand lever until nozzle test gauge
indicates 285 psi
(1966 kPa) below specified
opening pressure.
2. Consider nozzle leak-proof if no fuel (not even
one drop) emerges from nozzle tip within
10
seconds.
Chatter Test
Operate hand lever downward (1 or 2 nozzle
opening cycles per second) until nozzle ejects a
stream of fuel with a soft chattering sound.
Take pressure readings from gauge.
Slightly increase hand lever movements (2 or
3
nozzle opening cycles per second), the stream
velocity should increase and create a hissing
sound.
Accelerate lever movements to4 to
6
nozzle open-
ing cycles persecond.The nozzleshould createa
shrill whistling sound and a spray pattern.
SPRAY PATTERN
The spray pattern must be compact and well atom-
ized at full
lift
to be correct. The pressures between
nozzle opening and full
lift
causes the fuel to emerge
in a stream, changetoflag-likeformations, and finally
reach atomized spray pattern at full lift, with lever
movements producing 4 to
6
nozzle opening cycles
per second. See Figure
69.
Closed
FIGURE
BLEEDING
FUEL
SYSTEM
Bleed fuel system whenever the filters are changed or
when
there
is
air
in
the
lines.
Procedure:
Manually actuate fuel transfer pump until air bubbles
are all out and clear fuel flows from the bleed valve
automatically, Figure
70.
If
the transfer pump cam lobe
is
on the high side, the priming lever
will
not operate the pump. Rotate the flywheel one revolution
before
operating the priming lever.
BLEED
VALVE
FUEL
RETURN
CONNECT
FIGURE
70.
BLEEDING FUEL SYSTEM
PREHEATING
CIRCUIT
This 12 volt battery circuit consists partly of manifold
heaters that raise the combustion air temperature at
the intake manifold and a glow plug in each cylinder
that heats the precombustion chamber for engine
starting, Figure 71. The manifold heater and glow
plugs are wired in parallel and are controlled by a
preheat switch on the control box.
GLOW PLUG
MANIFOLD
HEATER
FIGURE
71.
GLOW PLUG AND MANIFOLD HEATER
Slightly
open
(pilot spray)
69.
NOZZLE
SPRAY
ACTION
59
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