Quantcast Carburetor - TM-5-4320-234-120051

 

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TM-5-4320-234-12 Pump Centrifugal Self-Priming Gasoline Engine Driven Wheel Mounted 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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Crankcase Emission Control System
TM 5-4320-234-12
4-24. Carburetor (Fig. 4-10)
adjust the carburetor as follows:
a. Adjustment. If troubleshooting indicates that the
carburetor is responsible for faulty engine operation,
8. Main adjusting screw
1.
Throttle cable
9. Carburetor float bowl
2.
Throttle cable clamp
10. Flood relief drain cock
3.
Idle speed adjustment screw
11. Choke control cable
4.
Carburetor throttle lever
12. Choke cable clamp
5.
Idle mixture adjustment needle
13. Carburetor choke lever
6.
Carburetor inlet filter
7.
Throttle rod
Figure 4-10. Carburetor, showing adjustment points.
(1) Start with engine and allow it to warm to
air admitted to the idling system which functions only at
operating temperature.
low speeds. Adjust as follows:
(a) With the engine at idle, turn the idle
(2) Adjust the main adjusting screw (8, fig. 4-
mixture adjustment screw clockwise to cut off air,
10).  This adjustment determines the amount of fuel
making the fuel mixture richer, until the engine starts to
available for high-speed operation. Adjust as follows:
run roughly due to excessively rich mixture.
(a) Adjust the throttle control of the pump to open the
(b) Turn
the
adjustment
needle
carburetor throttle about one-fourth.
counterclockwise to obtain the smoothest idle operation
(b) Turn the main adjusting screw clockwise
possible.
to reduce the fuel to the engine until the engine begins
(c) If a vacuum gage is available, use a
to miss due to a lean fuel mixture.
vacuum gage attached to the intake manifold and adjust
(c) Turn
the
adjusting
screw
the needle for highest engine vacuum.
counterclockwise until the engine runs smoothly without
missing.
(4) Adjust the idle speed adjustment screw
(3, fig.
Turn the screw clockwise or
(3) Adjust the idle mixture adjustment needle
counterclockwise as necessary to provide 400 to 600
(5, fig. 4-10). This adjustment controls the amount of
4-21

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