INSTALLATION CARBURETOR FLOAT KIT

INSTRUCTION 666-1000
E-1000 MODELS MA-3 & MA-4SPA
READ ENTIRE INSTRUCTIONS BEFORE PROCEEDING WITH WORK.
REMOVE CARBURETOR FROM ENGINE.
REFER TO THE APPROPRIATE CARBURETOR PART NUMBER EXPLODED VIEW
AND PARTS LIST FROM PRECISION AIRMOTIVE CARBURETOR FULL SERVICE
MANUAL; FORM #MSAFSM AND AIRCRAFT CARBURETOR SERVICE MANUAL;
FORM #FSM-OH1
KIT PARTS DATA 1.4 Remove the float valve seat and float
valve gasket using tool #M-104.
(1) 16-B85 Gasket-Throttle Body to Bowl
Discard the used float valve gasket.
(1) 16-B75 Gasket-Throttle Body to Bowl
(1) 16-223 Gasket-Float Valve (.016”) STOP! Further disassembly of the
(1) 16-224 Gasket-Float Valve (.031”) carburetor is not necessary to install the
float kit.
(1) 29-184 Clip, Float Valve
(1) 30-864 Float& Baffle Assy 2.0 INSPECTION
(1) 32-32 Shaft-Float Lever
(4) 78-A110 Washer-Throttle Body to 2.1 Before reassembly, thoroughly inspect
Bowl Screw the carburetor per Precision Airmotive
Aircraft Carburetor Service Manual.
(1) 82-11 Pin-Cotter, Float Lever Shaft If additional maintenance is required,
(1) E-1000 Instructions now is the time to do it to assure the
airworthiness of the carburetor and
1.0 DISASSEMBLY your work.
1.1 Separate the throttle body and bowl 2.2 Inspect the float valve and seat very
by bending the tabs on the washers
E-1000 and removing throttle body to bowl
screws. Discard the washers. NOTE:
carefully. If it exhibits indications of
wear, replace it.

INSTRUCTION If necessary to loosen, tap casting

lightly with a soft faced hammer and
2.3 Insure that the float valve seat and
especially the tip of the float valve are
pull apart. clean when assembled. Wipe the
SHEET 1.2 Remove float shaft cotter pin, float
rubber float valve tip between a clean
thumb and finger with a rotating
assembly, float shaft, and clip. motion.
Discard these pieces.

1.3 Remove and discard the throttle body

th to bowl gasket. Consult the Precision
14800 40 Avenue NE Airmotive Carburetor Full Service
Marysville, WA 98271 Manual to determine the correct
Tel: (360)651-8282 Fax: (360)651-8080 throttle body to bowl gasket. Discard
www.precisionairmotive.com the unused throttle body to bowl
gasket.

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3.0 FLOAT INSTALLATION mounting flange down and install the float valve is free and not binding in Airmotive Aircraft Carburetor Service
CAUTION: Exercise care during the proper throttle body to bowl gasket. clip. Reinstall float. If additional Manual.
adjustment is required, return to step
following operations to prevent damage to 3.5 Place the float and float valve 3.11 With the throttle body held inverted,
3.1 and use the 16-223 (.016”) float
the float. assembly into the float bracket with insure that a minimum of .015”
valve gasket or a combination of the
3.1 Install the float valve seat and 16-224 the float valve in the float valve seat, clearance exists between the forked
16-223 and 16-224 float valve
(.031”) float valve gasket using tool as shown in Figure 3. clip and the float valve seat, as shown
gaskets. in Figure 6. If additional clearance is
#M-104. Torque to 10-12 foot FIGURE 3 FIGURE 5 required, bend the tips of the clip
pounds.
slightly and/or use a thinner float
NOTE: Initial run-in torque must be at Unbent valve gasket. If a thinner float valve
least 6 inch-pounds. If run-in torque Tab gasket is used, return to step 3.1 and
is less than 6 inch-pounds, the nylon
repeat adjustment procedure. Ensure
locking element is degraded or
that the needle is free to move, and
damaged, and the float valve
does not bind on the clip.
assembly must be replaced.
FIGURE 6
3.2 Position the clip onto the float lever as
shown in Figure 1.
FIGURE 1

3.6 Insert the float shaft through the float

bracket and float. Bent Tab
3.7 To adjust the float properly it is .015” MIN
CAUTION: Both Float Pontoons Must
suggested a 7/32” drill rod be used as See Detail 2 for clip close-up.
Be The Same Height Above The Gasket.
shown in Figure 4 to measure the
Float Lever May Be Bent Slightly If
adjusted clearance between the
Required to Correct Pontoon Height. 3.12 When the adjustments have been
throttle body to bowl gasket and float,
DO NOT APPLY PRESSURE TO THE completed, install the float shaft cotter
measured near the tip of each
VALVE AND SEAT DURING pin through the float shaft. Bend the
pontoon.
ADJUSTMENT BENDING. ends of the float shaft cotter pin all the
FIGURE 4 way back.
3.3 Place the float valve into the forked 3.9 Insure that the float shaft is free to
clip on float as shown in Figure 2. rotate in the float and that the float 4.0 FINAL ASSEMBLY AND TEST
valve movement is not restricted
FIGURE 2 between the fully open and fully 4.1 Assemble the throttle body and bowl
closed position of the float valve. If as prescribed in the Precision
the float shaft binds in the clip, the Airmotive Aircraft Carburetor Service
clip may be removed and bent a small Manual.
amount to allow the shaft to rotate 4.2 Perform the float valve and seat test
freely. as prescribed in the Precision
3.10 Insure that proper clearance exists Airmotive Aircraft Carburetor Service
between the float and carburetor bowl Manual.
3.8 If adjustment is required, remove the using gage M-510 and a .081” drill FAILURE TO FOLLOW THESE
float and bend the adjustment tab rod as prescribed in Precision INSTRUCTIONS MAY RESULT IN
Detail 2: Side view of (Figure 5) located over the float valve Airmotive Aircraft Carburetor Service ADVERSE CARBURETOR
tangs on clip to achieve the 7/32” setting. A small Manual. If proper clearance does not PERFORMANCE AND ENGINE
DETAIL 2 screwdriver bent 30° approximately ¼ exist, the float bracket may be OPERATION.
inch from its tip is a useful tool for repositioned laterally by loosing the
3.4 To install the float and float valve, attachment screws, repositioning, and
place the throttle body with the making this adjustment. Do not bend
tab more than .030”. Ensure that the re-torqueing as prescribed in Precision
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