Stihl FS 240 Service Manual page 34

1
2
1
: Insert and tighten down the
screws (1)
: Turn spindle (2) clockwise until
the crankshaft stub has been
forced out of the ball bearing
The starter-side half of the
crankcase is pulled off by this
procedure.
– Undo the screws and remove the
puller
– Replace ball bearings and oil
seals, b 5.6.1 and b 5.3
Ignition-side half of the
crankcase
1
: Position the crankcase half (1) on
suitable surfaces so that it is held
securely and the installed guide
sleeves (arrows) are not
damaged
There must be sufficient clearance
downward so that the crankshaft
can be pressed out.
FS 240 C, FS 260 C, FS 360 C, FS 410 C, FS 460 C-M
1 1
2
1
: Position a suitable punch (1) on
the cylinder side crankshaft stub
and press out crankshaft (2)
Crankshaft, con-rod and the needle
bearing between them form a
complete unit which must always be
replaced as such.
1
: Examine ignition side (1) and
starter side (2) halves of case for
cracks and check all mating
surfaces (arrows) for damage
If the original crankcase is reused,
the oil seals and ball bearings must
be replaced, all gasket residues
removed and the mating surfaces
cleaned thoroughly (also in the
circumferential groove of the
ignition-side half of the case). The
mating surfaces must be absolutely
flawless and clean to guarantee a
perfect seal.
– Replace ball bearings and oil
seals, b 5.6.1 and b 5.3
– Before installation, clean the
crankshaft, b 14
Installation
Ignition-side half of the
crankcase
Avoid damage to the crankshaft
stub.
: Orient the crankshaft with the
conical crankshaft stub (arrow)
facing the ignition-side ball
bearing
2
– Heat only the inner race of the
ball bearing to approx. 120 °C
(250 °F)
: Press crankshaft stub fully home
The crankshaft must be fitted
rapidly, as the heat is transmitted to
the crankshaft stub and the inner
bearing race contracts.
33