Stihl MS 171 Manual page 38

: The crankshaft (1), connecting
rod (2) and needle bearing (3) are
an inseparable unit. This means
the crankshaft must always be
replaced as a complete unit.
When fitting a replacement
crankshaft, always install new ball
bearings and oil seals.
– Clean the crankshaft before
installing, b 16
1
2
Use a firm support (2) to protect the
crankshaft.
: Apply a suitable sleeve (1) to the
inner race to press home the ball
bearing at the clutch side as far
as stop.
MS 171, MS 181, MS 211
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1
3
2
2
1
Use a firm support (2) to protect the
crankshaft.
: Apply a suitable sleeve (1) to the
inner race to press home the ball
bearing at the ignition side as far
as stop.
– Lubricate the needle bearing with
oil.
– Install the piston, b 8.8
– Install the crankshaft and oil
seals, b 8.6
– Install the engine, b 8.5
8.8 Piston
– Remove the engine, b 8.5
– Remove the crankshaft, b 8.6
: Use a suitable tool to ease the
hookless snap rings out of the
grooves in the piston bosses
(arrow).
: Position the small diameter of
assembly drift (1) 1110 893 4700
against the piston pin.
1
: Use the assembly drift (2)
1110 893 4700 to push the piston
pin (1) out of the piston.
If the piston pin is stuck, release it
by tapping the end of the drift with a
hammer. Hold the piston steady
during this process to ensure that
no jolts are transmitted to the
connecting rod..
1
: Remove the piston (1) from the
connecting rod.
– Inspect the piston rings and
replace if necessary, b 8.8.1
1
2
37