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When
a
component
of
the propeller
co
ntrol
linkage is replaced
the
entire linkage
should
be
checked
and if necessary
readjusted in a definite
sequen
ce.
To check for
the proper
static rpm
pro-
ceed
as follows:
(a)
Set the
propeller
contr ol
lever
approximate-
ly
1/
8 inch
from
the
forward end of
the
s lot in the
control console and tighten
the friction lock.
(b)
Set
U1e
governor
arm
against
the high
rpm
stop.
The low pitch
s top
adjustment
screw,
as
originally set, s
hould
not
be disturbed.
(c)
Adjust the rod ends
on
the
linkage to main-
tain the high
rpm
position and install the attaching
bolts.
If
sufficient
adjustment cannot be obtained
at the
rod ends,
loosen the
c
lamp
at
tile
firewall and
pull the
cable
housing through far
enough
to obtain
the
nec
essary
adjustment.
(d)
Check travel
of
the
control
lever to insure
full travel
of
the governor arm
between
stops.
(e)
Pull tile feathering
circuit breaker in
tile
left-hand subpanel, set
the propeller control
Lever
in
the high rpm
position
and
start the engine. After
the engine has warmed
up to normal operating tem-
perature, exercise the
propeller several times and
advance the throttle
to full
open
position.
(
f)
Check the static
rpm.
If
the
static
rpm
is
not 3200-3250 when
the
governor arm
is
against
its
high rpm stop, check
fue synchronization
of
fue
propeller
with
the
transmission as
outlined
in
the
paragraph,
Static RPM.
If
the hydraulic cam stops
the propeller according
to
the
Limits
given,
and
all
possible carburetion
and
ignition
troubles
have
been
eliminated,
adjust the governor
high rpm
stop.
If
fuis is
to no avail
replace the governor.
4.8.4
Control
Detent Stop
Adjustment
-
After the
proper
static rpm is
obtained,
the
Low
rpm
stop, consisting of
a cam and detent behind
the
instrument
panel, may be
adjusted
as
follows:
(a)
Make sure
the
feathering
circuit breaker hai=;
not been reset.
(b}
With the engine
running
and
the propeller in
high rpm,
move
fue propeller
control
toward low
r
pm
and advance
the
throttle until 2100-2150 rpm is
ob-
tained with a
manifold
pressure
of approximately
24
inches
hg.
The
propeller control should be
at
the
upper edge of
the
begin unfeathering mark on the con-
trol
quadrant.
(c)
On
obtaining the above setting, leave the pro-
peller control
in
position and stop the engine with the
mixture
control.
If
hydraulic feathering starts pre-
maturely,
turn
the square-end screw on top
of
the
governor
clockwise
just enough to start feathering
slightly
below
2100 rpm
(d}
Loosen fue lock nuts on the cam actuating
rod and adjust
the cam to come
into
contact with the
detent.
(e)
Tighten the Lock nuts.
(
f)
Start engine and check fue rpm at the point
where fue stop is felt on the control. If the
stop
is
not felt at 2100-2150 rpm, it must be readjusted.
4.8.5
Hydraulic Feathering Adjustment
-
After the low rpm stop has been set proceed
as follows to adjust the hydraulic feathering:
(a)
Pull fue propeller control Lever back until the
detent of the .low rpm stop is just
over
the Ughest
27
portion of
th
e cam in
the
propeller
contro
l linkage.
Hydraulic fea thering
s
hould
begin
at
this point.
(b}
If
necessary,
turn
adjusting screw (8,
figure
5-28) counterclockwise to begin fue hydraulic feather-
ing
action
soo
ner
or
c lockwise
to begin the hydraulic
feathering
later.
If
hydra
ulic
feathering action
occ
ur
s
pre-
maturely,
it will be
necessary to move the propeller
co
ntrol
lever into the
constant speed
range between
adjustment checks to prevent
complete
feathering
af
the blades.
(c)
A
positive
s
top
must
be
felt at the Low rpm
end
of
the
constant speed range
of the
propeller
con-
trol
Lever before
any feathering
action takes place.
4.9
OIL SYSTEM
-
Each engine
incorporates a wet
sump
pressure-
type oil
sys tem
with an oil pump
in fue engine,
and
a thermostat a
nd
an
oil coole
r
for
automatic temper-
a
ture control. Capacity
for
each engine
is tilree
US
gallons.
Oil
cooler
radiators
are mounted
in
the
Lower
engine cowling
of each nacelle
and are
cooled
by
ram
air passing
through
the forward
air entrance
opening in the cowling. The
oil
temperature
is
con-
trolled automatically
by
thermostat-type
valves that
by-pass
oil
around
the radiator until
the
engine
oil is
warmed
to operating
temperature.
4.9.1
4.9.1.1
(a)
(b)
(c)
4.9.1.2
(a)
(b)
(c)
4.10
Oil Radiator -
Removal -
Drain engine oil sump.
Disconnect flexible hose at the
oil
radiator.
Remove the bolts retaining the
oil radiator.
Installation -
Place oil radiator in position for
installation.
Install retaining bolts and tighten.
Connect flexible inlet and
outlet
hose.
FUEL SYSTEM -
The fuel system of the Model B-50 provides a
total capacity of 135 US gallons in four fuel cells.
These cells are located in the outboard wing and wing
center section. The cells in the center section have
a
capacity of 42.5 US gallons each and are considered
the main tanks. The cells in the butt of the outboard
wing have a capacity of 25 US gallons each and are
used
as auxiliary
tanks. The inboard tanks are inter-
connected through the fuel selector in such a manner
as to provide cross-feed from eifuer inboard fuel
tank to either or both engines. An electric fuel boost-
er pump in each inboard fuel cell provides a positive
fuel flow in all flight attitudes, also serving as an
emergency fuel booster pump in the event of failure
of an engine-driven fuel pump. The carburetors are
pressure type; excess fuel from fue carburetors is
returned to the inboard fuel cells.
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