Stihl FS 94 Instruction Manual page 32

All models
2
: Remove any gasket residue and
clean the sealing faces (arrows)
thoroughly (including the
peripheral groove in the starter
side of the crankcase)
– sealing faces must be in good
condition and clean.
: Check ignition side (1) and
starter side (2) of crankcase for
cracks and all sealing faces
(arrows) for damage.
– Replace damaged crankcase
halves, b 5.6.1.
If the original crankcase is used
again, replace the oil seals and ball
bearings.
– If the original halves of the
crankcase are used again,
replace the ball bearings and oil
seals, b 5.6.1 and b 5.3
– Before installing, clean the
crankshaft, b 12
Series 4149 Powerhead
Installing
Ignition side of crankcase
1
Take care not to damage the
crankshaft stub.
– Lubricate the crankshaft stub with
oil.
1
: Position the tapered stub (arrow)
of the crankshaft (1) above the
ball bearing at the ignition side.
– Heat inner race of ball bearing to
about 160°C (320°F).
: Push the crankshaft home as far
as stop.
This operation must be carried out
very quickly because heat is
absorbed by the crankshaft, and the
inner bearing race shrinks.
Starter side of crankcase
Take care not to damage the
crankshaft stub.
1
: Apply sealant (1) to peripheral
groove (arrows), b 12
: The bead of sealant should be
about 1 mm high (a).
Make sure the sealant does not
project into the crankcase.
– Lubricate the crankshaft stub with
oil.
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