FAN
The fan, like all other rotating parts, is statically
balanced
to
prevent trouble due
to
its
high speed
(45
percent higher than engine speed) which
might
result in blade failure.
The maximum permissible out-of-balance
is
0.555 oz./in.
(400
gr./mm.).
Always check blades for bending and for face
alignment (Fig. A.VI/6) using a surface gauge.
Some bends can be straightened
out
with
a fork
bar, provided that they
do
not
alter the radial
shape and
do
not endanger the strength
of
the
fan.
WATER TEMPERATURE GAUGE
Colored band type gauge, the band being made
up
of
three sectors, as follows:
White Sector
....................
86
o -167 °F.
(30
° .
75
°C.)
Central Green
...................
167
o-
221
°F.
(75
° •
105
°C.)
Red
Sector
.....................
221
o-
239 °F.
(105°
·115°C.)
The dial is within the green central sector under
normal operating conditions.
Test the gauge, should any doubt arise about
its
reliability, by dipping the bulb in water and then
checking the scale graduation versus a
test
calibrated gauge. Repeat test for greater safety.
FIG. A.VI/6 CHECK THE FAN BLADE FACE
ALIGNMENT WITH A SURFACE GAUGE.
Engine-
46
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