Stihl MS 171 Manual page 40

– Install the snap rings at both
sides.
: Apply the installing tool
5910 890 2210 with the sleeve's
taper against the piston boss,
hold the piston steady, center the
tool shank exactly and press
home until the snap ring slips into
the groove.
1
2
Fit the snap ring (1) so that its gap
(arrow) points up. It must not be
near the recess (2).
– Check position and security of
both snap rings.
MS 171, MS 181, MS 211
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– Check the piston rings and
replace if necessary., b 8.8.1
– Check the oil seals and ball
bearings and replace if
necessary., b 8.7
– Install the crankshaft, b 8.6
– Install the engine, b 8.5
8.8.1 Piston Rings
– Remove the piston, b 8.8
– Remove the piston rings from the
piston – the MS 171 has only one
piston ring.
: Use a piece of old piston ring to
scrape the grooves clean.
: Install the new piston rings in the
grooves so that the radii face
upward (arrows).
: Position the piston rings so that
the radii at the ring gap meet at
the fixing pin in the piston groove
(arrows).
– Check correct installed position
of the piston rings (arrows).
– Install the piston, b 8.8
39