Stihl MS 231 Manual page 41

2
1
3
: Fit installing sleeve (1)
1141 893 4600 on the straight
crankshaft stub and installing
sleeve (2) 1118 893 4602 on the
tapered crankshaft stub.
: Fit new oil seals (3) with their
sealing lips facing the crankshaft.
– Lubricate the piston, piston rings
and cylinder wall with oil, b 14
: Install the piston rings so that the
radii at the ring gaps meet at the
fixing pins in the piston
grooves (arrows).
40
All manuals and user guides at all-guides.com
3
2
: Line up the crankshaft (1) so that
the piston (2) points towards the
cylinder bore and its long stub (3)
towards the lugs (arrows).
1
2
The top of the cylinder bore is
tapered to ease installation.
When pushing the piston into the
cylinder, check that the gaps in the
piston rings meet at the fixing pins
– they might otherwise break.
: Position the piston (1) on the
cylinder bore and ease it into the
cylinder (2).
1 3
: Push the crankshaft (1) into the
bearing seats (arrows) as far as
stop.
: Position the oil seals (2) so that
they are flush with the housing.
Alignment the oil seals
Use the correct press sleeves to
position the oil seals squarely and at
the right installed depth.
: Push press sleeve (1)
1122 893 2405, collar facing
cylinder, on to the straight and
tapered crankshaft stubs as far
as stop.
MS 231, MS 231 C, MS 251, MS 251 C
2 2
1
1 1