Replacing The Oil Seals - Stihl 029, 039 Service Manual

STIHL 029, 039
Leakage test with vacuum pump
Note: When you release the pump
piston, the non-return valve auto-
matically seals the suction hose. If the
vacuum reading remains constant, or
rises to no more than 0.3 bar
(4.25 psi) 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 crankcase),
the oil seals must be replaced, even if
no leaks were
detected in the pressure test.
- Remove the test flange and refit
the carburetor - see 11.2.
- Remove the flange and sealing
plate.
- Refit the muffler - see 4.1.
Note: If oil seals have to be
replaced - see 4.3.
4.3 Replacing the
Oil Seals
Top:
Puller 0000 890 4400 with
No. 6 jaws 0000 893 3711
Bottom:
Removing oil seal at
clutch side
It is not necessary to disassemble
the complete engine to replace the
oil seals.
Clutch side:
- Remove the oil pump - see 10.3.
- Apply the puller and withdraw the
oil seal at the clutch side.
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