Tecumseh ECV100-120 - TECHNICIAN S Handbook page 25

ASSEMBLY
Welch Plugs
To install a new welch plug after cleaning the carburetor,
secure the carburetor in a vise equipped with protective
jaws. Place the welch plug into the receptacle with the
raised portion up. With a punch equal to, or greater than
the size of the plug, merely flatten the plug. Do not dent or
drive the center of the plug below the top surface of the
carburetor. After installation of the welch plug, seal the
outer diameter with finger nail polish or equivalent (diag.
42).
Throttle Shaft and Plate
When reassembling, it is important that the lines or lettering
on the throttle plate are facing out when in the closed
position. Position throttle plate with two lines at 12 and 3
o'clock. If the throttle plate has only one line, the line should
be positioned in the 12 o'clock position on Series 1, 6, 8,
and 9 carburetors, and positioned in the 3 o'clock position
on Series 3 and 4 carburetors (diag. 43 & 44).
Test the operation of the throttle and return spring (if
equipped). If binding occurs, correct by loosening screws
and repositioning throttle plate.
Always use a new screw(s) when reinstalling the throttle
shutter (Tecumseh screws are treated with dry-type
adhesive to secure them in place).
NOTE: NEVER REUSE OLD SCREWS.
Choke Shaft and Plate
The choke plate is inserted into the air horn of the carburetor
in such a position that the flat surface of the choke is
down. Choke plates will operate in either direction. Make
sure it is assembled properly for the engine. Test the
operation of the choke and return spring function if equipped
(diag. 45).
Always use a new screw(s) when reinstalling the choke
shutter as the screws are treated with dry-type adhesive
to secure them in place.
NOTE: NEVER REUSE OLD SCREWS.
The choke shaft and plate must be in the closed position
prior to tightening the screws. Hard starting may be due to
insufficient choking action because of a misaligned choke
plate. Correct by readjusting the choke plate to close
completely. Note the cut-out position of choke shutter if
applicable.
Fuel Inlet Fitting
Support the carburetor body with a wood block to avoid
damage to other parts. Use a bench vise or press to install
the fitting squarely. Insert the tip into the carburetor body,
coat the exposed portion of the shank with Loctite grade
A, then press it in until the shoulder contacts the carburetor
body.
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