Stihl MS 461 - Impulse Hose; Tank Vent; Testing

88 MS 461, MS 461-R
: Position the manifold flange (1) –
its flats (arrows) must locate
against the studs (2).
: Fit the washer (3) and push the
sleeve (4) into the manifold (1).
– Install the carburetor, b 12.4
– Reassemble all other parts in the
reverse sequence.
12.7.1 Impulse Hose
A damaged impulse hose can
cause engine running problems.
– Remove the carburetor, b 12.4
– Remove the tank housing,
b 12.9.3
: Pull the impulse hose (1) out of
the tank housing in the direction
of the cylinder.
– Check the impulse hose and
replace if necessary.
1 2
2
3 4
3443RA101 TG
3443RA437 TG
1
– Coat tapered outside of new
impulse hose with STIHL press
fluid, b 15
: Push the impulse hose (1)
through the hole (small arrow)
and push it home until its rubber
lip is properly seated.
: Position the impulse hose (1) so
that the rounded side (arrow) of
the flange faces up.
– Install the tank housing, pushing
the impulse hose onto the stub at
the same time, b 12.9.3
– Install the carburetor, b 12.4
– Reassemble all other parts in the
reverse sequence.
1
3443RA438 TG
1
3443RA439 TG
12.8 Tank Vent
12.8.1 Testing
If problems occur on the carburetor
or the fuel supply system, also
check and clean the tank vent and
replace it if necessary. Check
function by performing pressure and
vacuum tests on the tank via the fuel
suction hose.
– Open the fuel tank cap and drain
the fuel tank, b 1.
– Close the tank cap.
– Remove the carburetor, b 12.4
Vacuum test
: Push nipple (1) 0000 855 9200
with hose (2) into the fuel suction
hose.
: Push the ring (3) to the left and
connect the pump (4)
0000 850 1300 to the hose (2)
– create a vacuum in the fuel
tank.
Equalization of pressure takes
place via the tank vent. There must
be no buildup of vacuum in the tank.
– Clean the area around the tank
vent.
– If necessary, install a new tank
vent or tank housing, b 12.8 or
b 12.9.3
3443RA441 TG
4
3
1 2