ADJUSTMENTS
GARBURETORADJUST:MENTS,
GASOLINE
...
The carbl!.retor has
ad-
justable main and idle
needle valVes.
Refer
to
the illustration,
Carburetor
Adjustments.
Dur-
. ing the
test
run
of
a.
new
generating plant; the factory
performs
carbure-
tor
adjustments which under normal
circumstances
should not be
dis-
turbed.Thecarburetor
is
simple
in construction and normally needs
little attention other
than
aperiodic
cleaning,
as
instructed under MAIN-
TENANCE
AND
REPAlR.
.
The
c.orrect setting
for
themairi
jet
needle gives the
best
stability
at
full
rated
load
()peration~·
The main needle setting
will
be
about
1-3/4
..
turns
open. .
f
(
The
correct
setting
for
the idle needle gives the
best
stability
at
no
load
operation. The idle needle setting will be about
1/2to
1
turn
open.
Before
tampetingwith
jet
settitlgs,
mark
the existing adjustment
or
countthe
number
of
turns
the
needle
WaS
backed out from
its
seat.
:NEVERfOI'ce the needle against its
seat
more
than fffinger tight
l1
be-
too
't1o't'I'tl!u
If
the
carburetor
IS entirely out of adjustment, open
the
main needle
. about
2turns and the idle needle about.1 turn,
to
permit
starting.
Make
final adjustments afte.t the
plant
reaches normal operating
temperature.
To make the
final
adjusbnei:tt, slowly
turn
the
main
needle inward (clock-.
Wise) for
leanetmixture,
until the plant begins
to
lose
speed,
or
the
voltage eh-ops.· Then
turn
the needle outward (counterclockwise) slowly
to
the
pomt
where
the
plant
will
carry
the rated
lull
load.
Checkthe
operation
at
various loads.
It
there.
is
a teildency tu hunt (alternately
mcrease
and
decteasespeed)
at
any luad; turn the adjusting needle out
for
richer
fuel mixture, \illtilthe hunt
iseorrecled,.
but do not
turn
the
adjusting
heedleoutmoI'e than
1/2
turn
beyonq
t:hepoint where
maximum
generator
outp.u.t
ISobtaified. Make the
flnaladjustmentofthe
idle
needJe
w~ile!hf:plantis.wal"'i.na.nd
operating
at
no
load. SlowlY
lotn
theld1e
..
a:dJustlngneedle.znward(clockwise) untll.the. plant loses
SP~d
from
.
.'
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