Stihl GS 461 - Page 35

34 GS 461
Ensure that the guide sleeves
(arrows) align with the holes and
that the housing gasket is not
jammed or buckled.
– Continue turning the spindle of
the assembly tool until the gap
between the halves of the
crankcase is closed
– Unscrew nuts.
– Turn the spindle clockwise to
remove the assembly tool
– Remove the two M5x72 screws
which were fitted to prevent
twisting
: Insert the screws (arrows) and
tighten them crosswise
– Install oil seals, b 5.3
– Fit flange with new oil seal,
b 5.3.1
3443RA117 TG
2411RA046 TG
– Examine and install the piston,
b 5.7
– Examine and install the cylinder,
b 5.5
– Reassemble remaining parts in
reverse order
5.6.1 Ball bearing / crankcase
The two halves of the crankcase
can be replaced individually if they
are defective.
Examine and clean the mating
surfaces of the crankcase halves
(including the cylinder sealing
surface) – The mating surfaces
must be without any damage
whatsoever.
New crankcase halves are
delivered with the relevant
components pre-assembled
– see spare parts list.
Those parts which are not supplied
with the new crankcase must be
removed from the old crankcase
halves, examined and replaced if
necessary.
When fitting a new crankcase, the
machine's serial number must be
stamped on the crankcase with 2.5
mm figure stamps.
If the old crankcase is reused, the
oil seals and ball bearings must be
replaced, all gasket residues
removed and the mating surfaces
cleaned thoroughly. The mating
surfaces must be absolutely
flawless and clean to guarantee a
perfect seal.
Examine both halves of the
crankcase for cracks and check all
mating surfaces for signs of
damage.
– Refer also to troubleshooting,
b 3.7
– Remove crankshaft, b 5.6
Ignition-side half of the
crankcase
: Carefully drive the oil seal out
with a punch
: Examine and clean the
crankcase half, replace if
necessary
– Replace the ball bearings if the
crankcase half is in good
condition.
– Heat the area around the bearing
seat to
approx. 160 °C (320 °F)
The bearing drops out of its own
accord when this temperature is
reached.
3443RA122 TG