Replacing The Oil Seals - Stihl 4141 Series Manual

5.4

Replacing the Oil Seals

Note:
It is not necessary to disassemble
the complete engine to replace the
oil seals.
Flywheel side
– Remove shroud - see 5.1.
– Remove the complete clutch -
see 4.1.
Remove the spark plug. Fit the
locking screw (1) 4170 893 1200
in the spark plug hole. Turn the
crankshaft counterclockwise until
the piston butts against the
locking screw.
Release and unscrew nut (2)
from flywheel (1).
14
1
Use clutch screws to secure
puller (1) 4112 890 4502 to
flywheel.
– Tighten down center screw to
remove the flywheel.
– Remove the Woodruff key from
the crankshaft stub.
Important:
Take care not to damage crankshaft
stub.
1
2
Apply puller (1) 5910 890 4400
with jaws 6 (2) and tension the
puller arms.
Pull out the oil seal.
1
Installing oil seal at flywheel side
– Inspect crankshaft running face
for scores.
– Clean sealing face in the
crankcase and lubricate lip of oil
seal with grease - see 11.
Fit installing sleeve(2)
1129 898 4600 over the
crankshaft.
Slip the oil seal (3) over the
crankshaft and against the
crankcase.
Important:
Note installed position: Closed side
of oil seal faces the flywheel.
Use the press sleeve (1)
4112 893 2401 to press home the
oil seal until it is flush with the
crankcase.
Important:
Clean crankshaft stub and hole in
flywheel with a standard solvent-
based degreasant containing no
chlorinated or halogenated
1
hydrocarbons - see 11.
– Fit Woodruff key in crankshaft,
2
mount the flywheel and tighten
down the nut to 19 Nm (14 lbf.ft).
– Remove the locking screw
4170 893 1200, install the spark
plug and tighten down to 15 Nm
(11 lbf.ft).
– Check air gap between magnets
on flywheel and ignition module -
see 6.2.2.
– Install the clutch - see 4.2.
Series 4141 Powerhead
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2
3