Stihl MS 461 - Vacuum Test

27MS 461, MS 461-R
: Fit the sealing plate (1)
0000 855 8106 on the exhaust
port – between the heat shield
and cylinder.
– Tighten the screws moderately.
The sealing plate must completely
fill the space between the two
screws.
– Remove the carburetor, b 12.4
: Washer (1) and sleeve (2) must
be in place.
3443RA063 TG
1
3443RA064 TG
1
2
: Line up the flange (1)
5910 850 4200 and fit it over the
studs
– Screw (2) for impulse hose
must be fitted at the bottom.
– Coat screw or inside of impulse
hose with STIHL press fluid,
b 15
: Push the flange (1)
5910 850 4200 into position so
that the screw (2) engages the
impulse hose (3).
: Fit the sleeves (1)
5910 893 1701.
: Fit the nuts (2) and tighten them
down firmly.
3
1
3443RA065 TG
2
1
3443RA066 TG
1
2 2
6.2.2 Vacuum Test
: Connect hose (1) of pump
0000 850 1300 to the nipple
(arrow).
: Push ring (2) to the left
– vacuum test.
: Operate the lever (3) until the
pressure gauge (4) indicates a
vacuum of 0.5 bar.
If the vacuum reading remains
constant, or rises to no more than
0.3 bar within 20 seconds, it can be
assumed that the oil seals are in
good condition.
However, if the pressure continues
to rise (reduced vacuum in the
engine),
the oil seals
must be replaced, b 6.3.
– After finishing the test, push the
ring to the right to vent the pump.
– Continue with pressure test,
b 6.2.3
1
3443RA067 TG
2
34