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 1.
Fuel supply hose
16.
Ball joint
31.
Stud
2.
Elbow
17.
Lock nut
32.
Assembled washer screw
3.
Elbow
18.
Governor-to-carburetor control rod
33.
Bolt
4.
Pipe plug
19.
Ball joint
34.
Flat washer
5.
Carburetor bowl drain hose
20.
Lock washer
35.
Gasket plate
6.
Adapter
21.
Nut
36.
Gasket
7.
Carburetor drain cock
22.
Lock washer
37.
Governor
8.
Fuel strainer
23.
Carburetor
38.
Gasket
9.
Elbow
24.
Gasket
39.
Cap screw
10.
Nipple
25.
Stud
40.
Lock washer
11.
Nut
26.
Governor spring
41.
Clamp
12.
Lock washer
27.
Cotter pin
42.
Nut
13.
Fuel pump
28.
Nut
43.
Lock washer
14.
Gasket
29.
Flat washer
44.
Choke control wire
15.
Nut
30.
Governor adjusting assembly
45.
Throttle control wire
Figure 4-11-Continued
4-24. Carburetor
c. Cleaning and Inspection.
a. Adjustment. If troubleshooting indicates that the
(1) Service the fuel strainer as directed in
carburetor is responsible for faulty engine operation,
subparagraph a above.
adjust the carburetor as follows:
(2) Clean all fuel lines and fittings with
(1) Start the engine and allow it to warm up to
cleaning solvent (fed. spec. P-D-680). Blow through
operating temperature.
them with compressed air to assure all are clear.
(2) Adjust the main adjusting screw (7, fig. 4-
(3) Inspect the hoses for cracks, fraying, and
damaged threads; replace damaged hoses.
available for high-speed operation. Adjust as follows:
(4) Inspect the 3-way valve for difficult
operation and for cracked or damaged threads; replace
a damaged valve.
(5) Inspect all other parts for cracks,
distortion, and damaged threads; replace damaged
parts.
d. Reassembly. Reassemble the fuel lines and
fittings as shown in figure 4-10 and items 1 through 7 of
any leaks noted.
4-23. Fuel Pump
a. Removal. Remove the fuel lines to the fuel
pump (para 4-22). Remove the two nuts (11, fig. 4-11)
and lock washers (12) that secure the fuel pump (13) to
the cylinder block; remove the fuel pump.
b. Cleaning and Inspection.
(1) Clean the fuel pump with a cloth
dampened with cleaning solvent (fed. spec. P-D-680);
wipe dry.
(2) Inspect the fuel pump for cracks,
damaged threads, and other obvious damage. Operate
the cam follower lever of the fuel pump to check for
1. Throttle wire
6. Carburetor
faulty movement. Replace the fuel pump if defective.
2. Idle speed adjust- 7. Main adjusting screw
ment screw
8. Carburetor bowl
3. Throttle lever
drain cock
washers (12). Connect the fuel lines to the fuel pump
4. Idle mixture adjust- 9. Choke wire
ment needle
10. Choke lever
5. Throttle rod
Figure 4-12. Carburetor and related parts.
4-15
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