Carburetor.

TM 5-4110-217-14

Replace defective parts with new items during

tion at no load can sometimes be corrected by an idle

reassembly.

adjustment.

c. Reassembly and Installation.

(1) Screw head casting (11) on carburetor

3-27.

Fuel Pump.

nipple (15).

Electric pump removal.

(2) Place gasket (13), filter screen (12), and

(1) Be sure power switch is in "OFF" position.

bowl (14), in place. Swing bail in place and tighten star

(2) Disconnect power lead to pump.

nut.

(3) Disconnect fuel lines at pump.

(3) Connect fuel pump line (3) at fuel filter

(4) Remove (2) mounting bolts from bracket.

(10).

(5) Remove pump from unit.

(4) Turn fuel shutoff valve on fuel filter (10)

b. Installation.

counterclockwise to full open position.

(1) Position new pump on unit.

(2) Install mounting bolts (2).

3-26.

Carburetor.

(3) Hook up fuel lines. Be sure line from fuel

tank hooks to inlet side of pump.

(4) Hook power lead to pump.

CAUTION

When adjusting carburetor, be very

3-28.

Fuel Lines and Fittings.

careful not to touch exhaust

Removal (fig. 3-10)

manifold. Painful burns will result.

(1) Remove drain plug (18) and drain

gasoline tank (1) of fuel.

Removal (fig. 3-11).

(2) Disconnect and remove fuel pump-to-

(1) Remove air cleaner (para. 3-2), fuel filter

engine pump line (3) Disconnect and remove fuel tank-

(para 3-25) and breaker mechanism box (para. 3-44).

to-fuel pump line (2).

(2) Loosen screw (65) to release choke

(3) Unscrew fitting (9) and nipple (15).

control link (66) at sisson choke lever.

(4) Unscrew filter sediment bowl (14) from

(3) Remove clip (76) to release throttle link

fuel filter assembly (10).

(75) at carburetor (52).

b. Cleaning and Inspection

(4) Remove two screws (53) and lockwashers

(1) Clean all lines and fittings and filter

(54) that attach carburetor (52) to intake manifold (110).

sediment bowl in an approved cleaning solvent. Use

(5) Remove carburetor and carburetor

compressor air to blow all dirt and sludge from fuel

mounting gasket (52A). Remove choke control link from

passages. Dry external surfaces with clean, lint-free

carburetor.

cloth.

b. Installation.

(2) Inspect fuel lines for cracks, dents, and

(1) Align holes in carburetor mounting gasket

other damage. Pay particular attention to root of flare.

(52A) and throttle body with holes in intake manifold

Check fittings and shut-off valve for damage threads and

(110). Attach carburetor (52) to intake manifold with two

other defects. Check operation of fuel shut-off valve on

screws (53) and lockwashers (54).

fuel filter assembly. Replace all defective parts.

(2) Assemble clip to throttle link (66) in hole of

c. Installation (fig. 3-10).

carburetor choke lever.

(1) Install filter sediment bowl (14) to fuel filter

(3) Insert end of choke control link (66) in

assembly (10).

hole of carburetor choke lever.

(2) Connect fuel pump line (3) to fitting (9) to

(4) Put choke control link (66) straight end in

fuel filter assembly (10).

sisson choke lever hole and secure with screw (65).

(3) Install nipple (15) between fuel filter

(5) Assemble breaker box (95), fuel filter (56)

assembly (10) and carburetor (16).

and air cleaner (1), (para 3-2, 3-25, 3-44).

(4) Connect fuel tank-to-fuel pump line (2).

c. Idle Needle Adjustment.

(5) Screw in drain plug (18) to gasoline tank

(1) When adjusting the idle jet needle, the

(1).

engine should be running at normal operating

temperature and without a load connected.

3-29.

Sisson Choke (Fig. 3-12).

(2) Turn the idle adjusting needle in until the

a. The sisson choke should not require any

engine loses considerable speed. Then turn it out until

seasonal adjustment. If adjustment becomes necessary,

the engine runs smoothly. A hunting condi-

pull choke lever up and insert a 1/16-inch diameter rod

through shaft hole (opposite end from

Change 3 3-15