Stihl MS 311, Manual, Page: 37 / 94

36 MS 311, MS 391
6.7 Piston
– Remove the cylinder, b 6.5
The snap ring at the clutch side
cannot be removed.
: At the ignition side, use a suitable
tool at the recess (arrow) to
remove the hookless snap ring
from the piston boss.
: Push the assembly drift (1)
1108 893 4700 through the
installed snap ring.
: Use the assembly drift (1)
1108 893 4700 to push the piston
pin out of the piston.
4903RA087 TG
1
533RA121 TG
If the piston pin is stuck, release it
by tapping the end of the drift
lightly
with a hammer.
Hold the piston steady during this
process to ensure that no jolts are
transmitted to the connecting rod.
– Remove the piston.
– Inspect the piston rings and
replace if necessary, b 6.8
: Pull out the needle cage (1),
check it and replace if necessary,
b 14
Installing
– Lubricate the needle cage with oil
and push it into the connecting
rod.
– Position the piston as shown so
that the mark (arrow) points to
the rear and the long crankshaft
stub (1) is on the right.
– Place the piston on the
connecting rod.
11
4903RA252 TG
1
4903RA088 TG
: Push the assembly drift (1)
1108 893 4700, small diameter
first, through the piston and small
end (needle cage) and line up the
piston.
– Lubricate the piston pin (2) with
oil.
: Fit the piston pin (2) on the
assembly drift (1) and slide it into
the piston.
: Remove the sleeve (1) from the
installing tool (2) 5910 890 2212.
533RA125 TG
1
533RA126 TG
1 2
1 2
0001RA481 TG