Stihl MS 291 User Manual

42 MS 271 C, MS 291 C
: Lubricate the needle cage (1)
with oil and push it into the
connecting rod.
– Install the piston, b
6.7
– Install the crankshaft and new oil
seals, b
6.5
– Install the cylinder, b 6.5
– Reassemble all other parts in the
reverse sequence.
6.7 Piston
– Remove the cylinder, b
6.5
– Remove the crankshaft, b 6.6
The assembly drift passes through
the installed snap ring. Therefore,
only one snap ring needs to be
removed.
: Use a suitable tool to grip the
hookless snap ring at the
recess (arrow) and ease it out.
2710RA119 TG
1
2710RA120 TG
: Slide the assembly drift (1)
1110 893 4700 through the
installed snap ring and push the
piston pin (2) out of the piston.
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
Installing
– Pull out the needle cage , check it
and replace if necessary.
: Lubricate the needle cage (1)
with oil and push it into the
connecting rod.
2710RA121 TG
2
1
2710RA123 TG
1
: Position the piston as shown so
that the arrow (arrow) points to
the rear and the straight
crankshaft stub (1) is on the right
– the arrow must point in the
direction of the exhaust port.
– Place the piston on the
connecting rod.
: Push the assembly drift (2)
1110 893 4700 into the piston, at
side with snap ring, and through
the small end (needle cage) – the
piston is aligned.
– Lubricate the piston pin (1) with
oil.
: Fit the piston pin (1) on the
assembly drift (2) and slide it into
the piston.
2710RA124 TG
1
2710RA126 TG
1
2

Stihl MS 291 Specifications

General

Engine Power	2.8 kW
Displacement	55.5 cm³
Weight	5.6 kg
Vibration Level (left/right)	4.5/4.5 m/s²
Guide Bar Length	16 in to 20 in
Fuel Tank Volume	460 ml
Chain Pitch	3/8"
Fuel Capacity	500 cc