Toro 51643 Service Manual page 28

Carburetor Reassembly (cont'd)
7. Replace the inlet needle pieces by installing the
inlet needle, the inlet needle spring, the inlet needle
arm and secure with the screw. See Figure 27.
/--
OVERFLOW
VALVE
INLET NEEDLE
ARM
INLET NEEDLE
PIN
INLET NEEDLE
SCREW
CARBURETOR BODY
Figure 27
Make certain the spring is securely seated in the
inlet needle arm and that the inlet arm positively
engages the inlet valve.
I
8. Using the carburetor body surface as reference,
check the inlet valve height. Inlet valve height can
be checked with a height gauge or with an
accurate depth gauge. See Figure 28.
Carburetor Inlet Needle Valve Height
1.4
to
1.6
mm (.055 to
.063")
INLET NEEDLE ARM HEIGHT
INLET NEEDLE
SPRING
9. Replace the main diaphragm parts by installing the
main diaphragm gasket against the carburetor, the
main diaphragm assembly upon the main
diaphragm gasket, the main diaphragm cover
upon the main diaphragm assembly. When
installing the main diaphragm assembly, position
the shaft of the pin toward the inlet needle arm, not
toward the tickler button.
NOTE: Sealant is not recommended on these
gasket surfaces.
Secure these pieces with four screws with lock
washers. See Figure 29.
Figure
29
10.
11.
Replace the fuel diaphragm pump parts by
installing the pump cover gasket against the
carburetor, the pumpdiaphragm against the pump
cover gasket, the pump cover against the pump
diaphragm and securing these pieces with four
screws with lock washers. See Figure
30.
NOTE: Sealant is not recommended on these
gasket surfaces.
Install the throttle cable with attached throttle parts
into the carburetor and secure by tightening the
throttle fitting.
The carburetor is completely reassembled and
ready for installation to the intake flange.
17