CARBURETORS
The following carburetors were installed
by
ONAN
for
a specific application
and
engine output.
Use
these
instructions
and
adjustment procedures
in
preference
to
those given
in the
Ford engine manual.
Carburetor, Gasoline: Carburetors have main and idle
adjusting needle valves.
The
main adjusting needle,
at
the bottom
of the
carburetor, affects operation
at
heavier load conditions.
The
idle adjusting needle,
at
the side
of the
carburetor, affects operation
at
light
and
no
load conditions.
For
location
of
adjustments,
see Figure
27.
Under normal circumstances, factory carburetor
ad-
justments should
not be
disturbed.
If
adjustments
have been changed,
an
approximate setting
of 1-1/2
turn.open
for
idle needle
and one
turn open
for
main
needle will permit starting. Adjust temporarily
for
smoothest running. Allow engine
to
thoroughly warm
up before making final adjustment.
To adjust "idle"
(no
load) needle, seethat no loads
are
connected
to
the generator. Slowly turn idle adjusting
needle
out
until engine speed drops slightly. Turn
needle
in
just
to the
point where speed returns
to
normal.
To adjust main needle, apply
a
full electrical
load.
Turn
the
main needle
in
until enginespeed begins
to
drop.
Slowly turn needle
out
until speed
no
longer
rises.
Try
various, electrical loads.
If
engine speed
fluctuates
at any
load,
turn main adjusting needle
out
slightly.
Do not
turn
out
more than
1/2
turn beyond
original full load setting.
If
stable speed cannot
be
obtained
by
such carburetor adjustment,
a
change
m
governor sensitivity adjustment will probably
be
necessary.
Combination Carburetor,
Gas
Operation:
If the
engine
is
equipped with
a
combination carburetor
(Figure
28), see
that
the
gasoline shut-off valve
is
closed.
The
electric choke must
be
adjusted
so
that
the adjustable cover
is
turned
10 to 12
notches
counterclockwise from
the "*"
mark. When properly
adjusted,
the
electric choke will
be
completely open
even
at
very
low
temperatures.
Gas fuel main adjustment should
be
made
at
full load
only.
Carburetor,
Gas:
Engines equipped
for
natural
gas
operation
use a gas
carburetor with combined
regulator. Carburetor adjustments
are the
same
as
the combination gas-gasoline carburetor.
Conversion kits
are
available
for LPG
operation
(Figures
30 and 31).
Contact your local Onan
representative
for
information. Give complete Model,
Spec
No. and
Serial
No. of set
when requesting
conversion information.
-GAS REGULATOR
GAS FUEL
ADJUSTMENT
ELECTRIC
CHOKE
MAIN
ADJUSTMENT-
ZENITH ELECTRIC CHOKE
SETTING
FOR
RUNNING
WITH
GAS
FUEL
-CARBURETOR
FIGURE
27.
GASOLINE CARBURETOR
FIGURE
28.
COMBINATION CARBURETOR
29
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