TM 5-4240-501-148P
CARBURETION
Pulsa-Jet, Vacu-Jet
Fig. 29 - Mixture Needle
NOTE: On Vacu-Jet carburetors there is a check ball in
the fuel pickup tube. To function properly, the screen
must be clean and the check ball free. Replace pipe if
Screen is clogged or the check ball is not free to move.
Carburetor Assembly, Zinc and "Minion"
When assembling carburetor, use new "O" rings,
gaskets and/or diaphragms. Install choke plate and
choke shaft. Choke shaft lever should be as shown in
Fig. 30, Illus. I, II, III.
Fig. 30 - Choke Lever
On zinc carburetors, install needle valve seat being sure
not to cause burrs in slot. Then install needle valve
assembly, Fig. 31 or Fig. 32.
NOTE: Some
zinc
carburetors
use
Minlon
valve
assembly, Fig. 32.
Fig. 31 - Needle Valve Assembly, Zinc Body
To install Minion needle valve assembly, place "O" ring
on shoulder of needle seat. Then turn needle in until
large seal washer just touches needle seat, Fig. 32.
Fig. 32 - Needle Valve Assembly, Minion Body
Install needle valve as an assembly being sure flat on
valve seat lines up with flat in carburetor body, Fig. 33.
Oil fill tube, part no. 280131 will help firmly seat valve
assembly.
Fig. - 33 - Assembling Valve in Minion Body
Place "O" ring in groove in throttle bore. Early "O" rings
had a square cross section. Current "O" rings have a
round cross section. Fig. 34.
Fig. 34 - "O" Ring
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