Fuel Tank Service; Carburetor Disassembly - Tecumseh TC Series Technician's Handbook

FUEL TANK SERVICE

TC type II engines have fuel tanks with an integral fuel
screen and integral outlet fuel fitting. Some TC type I engine
models use a pressed in fuel filter or a weighted filter and
a flexible fuel line in the tank. Integral screens or fittings
are not serviceable. Pressed in fuel filters and fittings can
be serviced using the following procedure (diag. 3-8).
1. Press the fuel fitting into the tank and feed the fuel line
in until the filter can be removed through the filler neck.
Remove the filter and fuel line if necessary.
2. To install a new filter and fuel line, push the new fuel
line through the tank outlet until the fuel line protrudes
through the filler neck.
3. On tanks without weighted filters, push a new filter on
the fuel line. For weighted filters, slide the new retaining
ring on the fuel line protruding from the filler neck.
Push the fitting into the line to the fitting shoulder. Slide
the retaining ring over the groove in the fitting and
crimp the retaining ring using a pliers.
4. Attach the fuel line and weighted fuel filter if applicable.
Pull the fuel line through the tank outlet. The filter barb
or the fuel fitting barb must protrude from the tank.

CARBURETOR DISASSEMBLY

1. Note or mark the location and sequence of the
diaphragm(s), gasket(s), and the metering or pump
cover. Remove the screw(s), gaskets, and
diaphragms.
2. Remove the idle mixture screw. On Tillotson model
HU carburetors, remove the plastic screw or brass plug
over the main mixture jet and remove the main mixture
jet if necessary for cleaning (diag. 3-9).
3. Use a 8-32 tap with the tapered flutes removed to turn
into the brass welch plug until it bottoms and begins
to turn the welch plug. Carefully pull the welch plug
from the carburetor body.
4. Note or mark the location and action of the throttle
and air vane, and choke shaft (if applicable). Remove
the screw holding the throttle or choke shutter to the
shaft. Remove the Torx T8 screw (use part # 670334)
holding the air vane to the throttle shaft if applicable.
Remove the clip screw, dust seal retaining clip, and
throttle shaft. On some older Walbro carburetors it is
necessary to remove the circlip on the end of the
throttle shaft to remove the shaft (diag. 3-9).
5. Remove the inlet needle valve, metering lever, and
metering lever spring by removing the retainer screw
on the pivot pin (diag. 3-9).
6. Remove the fuel inlet screen and check valve screen
using an "O" ring pick. Remove all welch plugs using
a sharpened small chisel. Drive the sharpened chisel
into the welch plug, push down on the chisel to pry
the welch plug out of position. Be careful not to damage
the carburetor body (diag. 3-10).
7. On Walbro carburetors, the fuel inlet fitting can be
removed with a pliers using a twisting and pulling
motion. Do not re-use the old fuel fitting. The fuel fitting
on Tillotson carburetors is not replaceable. Do not
remove. Carburetor cleaner will not affect this fitting.
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1.
3.
Dust Seal
Washer
Dust Seal
Inlet Valve
Needle
Fuel Inlet
Screen
Pry out
plug
Small Chisel
Not For Resale
Dust Seal Retainer
Metering Lever
Metering Lever Pin
Metering Lever Screw
Metering Lever Spring
Main Mixture Jet
Dust Seal
Dust Seal Washer
Throttle Shaft Return Spring
Throttle Shaft
Note: Do not allow chisel point to strike
carburetor body or channel reducer
Ò
Ô Pierce plug with tip
Welch Plug
2.
4.
3-8
Tension Spring
Idle Mixture
Screw
Welch Plug
Throttle
Shutter
Throttle
Screw
Shutter
3-9
1/8"
Ô
3-10
13