Piston - Stihl MS 261 User Manual

Clutch side of crankcase
: Use a punch to carefully drive out
the oil seal.
– Check and clean the crankcase
or replace if necessary.
– If this half of the crankcase is in
order, install a new ball bearing.
1
– Heat the area of the bearing seat
to about 160°C (320°F).
The bearing (1) drops out as soon
as this temperature is reached.
48
Installing
As the bearing seat in the clutch half
of the crankcase has no locating
face, the oil pump must be installed
first
– the oil pump serves as a locating
face.
– Install the oil pump, b b 11.3
– Heat the area of the bearing seat
to about 160°C (320°F).
– Position the ball bearing so that
the centering ring (arrow) points
toward the oil pump.
: Push the ball bearing home as far
as stop (oil pump).
This operation must be carried out
quickly because the bearing
absorbs heat and begins to expand.
– Check that ball bearing is
properly seated. If necessary,
use press arbor 1118 893 7200 to
carefully press the bearing fully
home until it butts against the oil
pump.
– Remove the oil pump, b 11.3
– Install the crankshaft, b 6.6
– Install the oil seals, b 6.3
– Reassemble all other parts in the
reverse sequence.
6.7

Piston

Before removing the cylinder,
decide whether or not the
crankshaft has to be removed as
well, b b 6.6
– Remove the cylinder, b 6.5
It is not necessary to remove the
snap ring at the clutch side.
: At the ignition side, apply a
suitable tool to the recess (arrow)
and ease the hookless snap ring
out of the piston boss.
MS 261, MS 261 C