Stihl 020 T Service Manual page 50

• Use a 4.5 mm (0.18") dia. drift to
press the valve jet out of its seat in
the direction of the venturi and
wash it in white spirit.
• Remove the sealing plug from the
metering chamber.
Caution: The sealing plug is
des-troyed during removal.
It should, therefore, only be re-
moved if a replacement is available.
• Wash the carburetor body and all
parts in fresh white spirit and blow
clear with compressed air, paying
special attention to the bores and
ports.
STIHL 020 T
• Insert valve jet so that it is exactly
square in the bore. Press it home
until it is flush with the bottom of the
metering chamber.
• Fit the inlet needle and the helical
spring in their respective bores.
Insert spindle in the inlet control
lever, engage clevis in annular
groove on the head of the inlet
needle and tighten down the round
head screw. Make sure that the
helical spring locates on the control
lever's nipple.
• Check easy action of the inlet
control lever.
Important: The top of the inlet control
lever must be level with the bottom of
the metering chamber. If necessary,
use suitable pliers to carefully bend the
lever.
• After fitting new sealing plug, fill gap
between carburetor body and plug
with Loctite - see 11.2.
• Carefully screw the high speed
(1) and low speed (2) adjusting
screws down onto their seats
and then back them off one full
turn.
• Fit metering diaphragm on end
cover.
• Place gasket on metering
diaphragm.
50