Tecumseh HH100 Handbook page 9

HIGH SPEED ADJUSTMENT SCREW. For service,
examine the taper of the high speed adjustment screw.
If the taper is damaged at the area where it seats,
replace the screw and fuel bowl retainer nut as an
assembly.
FUEL BOWL RETAINING NUT. Remove the fuel bowl
retaining nut including fiber washer.
Examine the small fuel passage in the annular groove
in the retaining nut. This passage must be clean
for the proper transfer of fuel into the idle metering
system. Replace any worn parts.
When replacing, torque the fuel bowl nut to 50-60
inch pounds.
TORQUE TO
50 - 60 INCH
POUNDS
FUEL BOWL. Check the bowl for corrosion or dirt.
Replace if necessary.
The fuel bowl must be free of dirt and corrosion.
When tearing down carburetor for repair, replace
fuel bowl "O" ring. Before installation lubricate the
"O" ring with a small amount of oil for easier installation.
The fuel bowl flat surface must be positioned on
the same side of the carburetor as the fuel inlet fitting
or same side as the float hinge pin to assure full
travel of the float.
CHECK FOR
CORROSION
AND DIRT
FLOAT. Remove the float. Examine the float for crushing
or holes. Examine the float hinge bearing surfaces
through which the float hinge pin passes and replace
if worn.
FUEL BOWL
FLAT OF FUEL BOWL
TOWARD FUEL INLET
FITTING
FIBER WASHER
FUEL BOWL
RETAINING NUT
"O" RING
BRASS WASHER
HIGH SPEED ADJUSTMENT
SPRING AND SCREW
"O" RING
FUEL BOWL
INLET NEEDLE. The inlet needle is anchored to
the float tab by a clip, to assure proper movement
of the inlet needle off of the seat when the float
drops. The inlet needle clip must be positioned as
shown during reassembly.
LONG END
OF CLIP
CHOKE END
Examine the inlet needle. If any wear is evident, or
any of the corners show signs of rounding, the needle
should be replaced.
The inlet needle hooks onto the float tab by means
of a spring clip. To prevent binding, the long, straight
end of the clip should face the choke end of the
carburetor as shown.
SERVICING THE VITON SEAT.
a. REMOVAL. If the seat is to be replaced use the
bent end of a paper clip or wire with a 3/32''
(.24 mm) hook. Push the hook through the Viton
seat hole. Then with the hook, pull the Viton seat
out. Replace with a new seat.
NOTE: A #4 crochet hook can also be used for removal.
b. INSTALLATION.
NOTE: After thoroughly cleaning the cavity, moisten
the viton seat with oil.
Insert the seat with the grooved side into the
cup. Press the viton seat squarely into the base
with a punch.
3/32"
(.24 mm)
HOOK END
INSTALLATION OF VITON SEAT
INLET NEEDLE
SEATS AT THIS
POINT
REMOVAL OF VITON SEAT
CLIP
OPEN END
OF CLIP
THROTTLE END
INSERT THIS
FACE FIRST
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