Installing Crankshaft - Stihl FS 120 Service Manual

 When fitting a replacement crank-
shaft always install new oil seals
and ball bearings.
•
Carefully knock the oil seals out
of the crankshaft.
1
•
Use press arbor (1) 4119 893
7200 to remove ball bearing.
•
Use press arbor (1) 4119 893
7200 to remove ball bearing.
 Inspect both halves of the crank-
case for cracks and replace if
necessary.

4.7.2

Installing Crankshaft

Each half of the crankcase may
be replaced separately.
New crankcases come with
factory-installed ball bearings.
If the original crankcase is used
again, remove the gasket residue
and clean the mating surfaces -
they must be cleaned very
thoroughly to ensure a perfect
seal.
•
Check that bushings are in posi-
tion. If necessary, drive bushings
into the crankcase.
 Heat area of bearing seat on
starter side of crankcase to
approx. 120°C (250°F).
1
•
Fit ball bearing in crankcase by
hand and push it home as far as
stop.
Note: This operation must be
carried out very quickly because
the bearing absorbs heat immedi-
ately and begins to expand.
1
•
If it is not possible to heat the
starter side of the crankcase,
use press arbor (1) 4119 893
7200 to press in the ball bearing
as far as stop.
 Heat area of bearing seat on
clutch side of crankcase to
approx. 120°C (250°F).
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