- When fitting a replacement
crankshaft always install new oil
seals and ball bearings.
•
Carefully knock the oil seals out
of the crankcase.
•
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 ne-
cessary.
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).
•
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.
•
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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4.7.2 Installing Crankshaft
20 FS 120, 200, 300, 350, 400, 450, FR 350, 450
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