80 TS 410, TS 420
: Carefully separate the metering
diaphragm (1) and gasket (2).
The diaphragm material is
subjected to continuous alternating
stresses and eventually shows
signs of fatigue. In other words, the
diaphragm distorts and swells and
must be replaced.
– Examine the metering diaphragm
for signs of damage and wear, fit
a new gasket.
– Note the order in which the
metering diaphragm (2) and
gasket (1) are installed.
: Align the gasket (1) and metering
diaphragm (2) so that the small
holes (arrows) face the oblong
hole (3).
370RA335 TG
21
370RA336 TG
2
1
3
– Align the end cover (1) so that the
connector (arrow) points towards
the adjusting screws.
: Carefully fit the end cover (1).
The holes must line up.
: Insert and tighten the screws
(arrows).
– Check that the diaphragm and
gasket are correctly seated, then
tighten down the screws cross-
wise.
370RA337 TG
1
370RA338 TG
– Ring (1) and the sealing ring
underneath must be in position.
: Line the lever (2) with rod (3) up
with the hole (arrow).
– Insert and tighten down the
screw.
– Check correct functioning: the air
valve must begin to open when
the throttle shutter is approx. ¼
open.
– Reassemble remaining parts in
reverse order.
– Tightening torques, b 3.5.
12.3.2 Inlet needle
– Remove the metering
diaphragm, b 12.3.1.
: Remove the screw (arrow).
370RA339 TG
2
1
3
370RA340 TG
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