STIHL 009, 010, 011 20
3.8.2
acuum Test 3.8.3 Replacing the Oil Seals
Leakage test with vacuum pump Puller 0000 890 4400 in position
Oils seals tend to fail when they are must be replaced even if no leaks The oil seals can be replaced with-
subjected to a vacuum. During the were found in the previous pressure out disassembling the crankcase. To
piston's induction stroke the sealing test. do this, first remove the clutch (2.3.1),
lip lifts off the crankshaft owing to the flywheel (4.4.4) and the contact set
lack of internal counterpressure. (4.4.7).The primary lead can be left on
the contact set.
An additional test can be performed
with the vacuum pump to detect this Both oil seals, on the ignition and
fault. The preparations for this test are clutch sides, can be pulled out of their
the same as described for the pres- seats with puller 0000 890 4400.
sure test (3.8.1).
Screw the No. 5 jaws to the puller and
Connect suction hose of vacuum push the jaws into the oil seal by
pump to nipple of test flange. Then pressing them down lightly and turn-
pull out pump handle until the pres- ing at the same time.
sure gauge indicates a vacuum of
0.5 bar. When you release the pump Open up the jaws by turning the wing
handle the non-return valve automati- nuts and then screw down the spindle
cally seals the suction hose. to pull the oil seal out of its seat.
If the vacuum reading remains con- Installation of the new oil seals is
stant or drops no further than 0.3 bar, described under 3.7.
the oil seals are in good condition.
However, if the vacuum continues to
drop (down to 0 bar), the oil seals
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