GASOLINE
CARBURETOR
GAS IN
3/4 NP
GAS LINE
(FLEXIBLE)
\
LET
(GAS) LOAD ADJUSTME
SECONDARY REGULATOR
T
-
-
(MODEL UN]
ti
FUEL PUMP
u\
PRIMING LEVER
(GASOLINE)
NT
FIGURE 4-9 -- TYPICAL GAS-GASOLINE FUEL SYSTEM
can be replaced.
After replacing these parts,
use the following procedure’ to adjust carburetor.
1.
Turn the idle stop screw in about 2 turns or until the butterfly valve is held slightly open.
2. Turn IDLE FUEL screw (gas carburetor only) all the way in until it bottoms lightly.
3. Turn the MAIN FUEL or LOAD screw all the way cl.osed then back out 5 turns for initial setting.
After preliminary adjustments are made,
runs smoothest at governed speed no load,
start the engine and adjust the MAIN FUEL until the engine
for final power adjustment.
then put the engine under normal load and readjust as needed
The idle fuel adjustment can remain completely closed if the engine is not
required to run at any other speed than load speed.
a
On the combination systems,
use the same general procedure as stated for adjusting the gas
adapter and that stated earlier for adjusting the gasoline carburetor.
GAS REGULATOR -- MODEL KN SECONDARY
. The orifice size and maximum inlet pressure are stamped on the cover of the KN-do not permit
inlet pressure to exceed maximum (usually’6 oz.).
If an electric solenoid is used, it should be mounted
close to the model KN.
To check inlet pressure,
The orifice size of the s.olenoid must be at least as large as orifice in regulator.
remove plug on fuel inlet,
inlet pressure to 4-7 ounces (t-12*’ water column)
insert manometer or ounce pressure gauge. Adjust
,
--inlet pressure is adjusted on primary regulator.
Reconditioning: Thoroughly wash all metal parts in cleaning solution, blow out all passages. Replace
all worn, damaged parts.
Inspect diaphragm and gaskets bonded to both sides of diaphragm--replace as
unit if diaphragm or gasket damage is evident.
Check brass orifice--replace if nicked. Replace rubber
seat if crushed or if foreign material imbedded in rubber.
all parts are clean and free of dirt, lint, etc.
Before. reassembling regulator, make sure
Adjustment (Lock Off): The lock off adjustment is provided only to shut off fuel when engine is not oper-
ating-it is not for adjusting fuel mixture or engine speed.
Readjustment should be necessary only after
47 l
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