3.
4.
5.
6.
7.
8.
Disconnect the lead wires from the
K5
relay
terminals.
Remove the three capscrews that secure the air
cleaner adapter to the carburetor and lift off the
adapter.
Remove the two capscrews that secure the
K5
relay bracket
to
the adapter and lift off the relay
assembly.
Disconnect the fuel hose and governor control
linkage from the carburetor.
Remove the two capscrews that secure the car-
buretor to the intake manifold and lift off the
carburetor.
Use the following procedures if
it
is necessary to
remove the intake manifold.
A. Disconnect the flexible fuel supply line from
the fuel vaporizer.
B.
Remove the exhaust manifold as described in
EXHAUST SYSTEM in this section to provide
clearance for lifting
off
the intake manifold.
Bending the fuel vaporizer
fubing will weaken fhe mefa/
which might cause cracks
fo
form.
Do
not
bend fhe vaporizer tubing
to
remove the
infake manifold.
C.
Remove the intake manifold capscrewsand lift
off
the intake manifold.
D.
Remove the two intake manifold gaskets from
the block and plug the intake ports with rags to
prevent loose parts from accidentally entering
the ports.
Assembly:
Reverse order of disassembly. Use new
gaskets between the exhaust manifold and engine, the
intake manifold and engine, and carburetor and intake
manifold. Tighten exhaust and intake manifold cap-
screws to specified torque. Tighten fuel vaporizer fit-
tings and check for leaks.
Carburetor Mixture Screw Adjustments
LP-gas carburetors have three adjustment screws that
must be properly set for satisfactory operation. The
throttle stop screw controls how much the throttle
plate remains open when the throttle is pulled back to
the closed position. The idle adjustment screw con-
trols the fuel mixture when the set is operating at no
load. The main adjustment screw controls the fuel
mixture when the set is operating at full load.
No
other
adjustments are required with an LP-gas carburetor
since there are no float or choke adjustments.
Mixture screws should not be adjusted until the igni-
tion system, governor, and other fuel system compo-
nents have been checked for correct operation.
If
the
carburetor is totally out of adjustment, turn the mixture
screws in until lightly seated. For a preliminary adjust-
ment turn the main adjustment screw out 2-1/2
(k1/4)
turns and the idle adjustment screw out
1
(f1/4)
turn.
ADJUSTMENT
SCREW
MAIN ADJUSTMENT
SC
4601
FIGURE
6-25.
MIXTURE
ADJUSTMENT
SCREWS
-
LP
GAS
Forcing the mixture adjustment
screws fight wlll damage fhe needle
and seaf.
Turn
in
on/y until right fension can be fe/f.
Starttheengineand allow itto run forabout
10
minutes
at light load. Refer to Figure 6-25 for location of the
adjustment screws. Use the following procedure to
adjust:
1.
Stop the set and connect a voltmeter, frequency
meter, and load bank to the generator output
leads.
2.
Start the generator set and apply a full load. Verify
thatthefrequencyis within59+2 hertzandadjust
the governor speed adjustment nut if necessary to
obtain required frequency.
3.
Turn the main adjustment screw inward until volt-
ageor frequency drop and then outward until volt-
age or frequency drop again. Set the main adjust-
ment screw at the point where the voltage and
frequency are highest.
4.
Remove the load and verify that frequency is within
62
1
hertz. Adjust governor speed adjustment
nut
if
necessary to obtain required frequency.
5.
Turn the idle adjustment screw inward until volt-
age and frequency drop and engine begins to run
rough or starts hunting. Back out idle adjustment
screw until engine runs smoothly without hunting.
6. Pull the governor linkage toward the front of the
set
so
that the throttle lever on the carburetor is
resting against the throttle stop screw. Adjust the
stop screw to obtain a setting of
55
hertz and 100
7.
Release the governor linkage and observe the sta-
bility of the set. Set the voltage and frequency and
adjust the sensitivity of the governor as specified
under Governor in this section. Add and remove a
half load several times to make certain the set does
not bog down or hunt.
(k4.5)
volts.
6-21
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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