Stihl MS 661 C-M User Manual

34 MS 661, MS 661 C-M
Clutch side of crankcase
Take care not to damage the
crankshaft stub.
: Fit two M5x72 screws (1) in the
holes at the ignition side – to act
as guides and prevent twisting.
: Fit a new gasket (2) and locate it
on the sleeves.
– Coat the straight stub of the
crankshaft with oil.
– Heat the inner bearing race to
about 160°C
(320°F).
: Position the clutch side of the
crankcase on the straight
crankshaft stub and the screws
and push it on as far as stop.
1
1166RA079 TG
21
1166RA081 TG
This operation must be carried out
very quickly because heat is
absorbed by the crankshaft, and the
inner bearing race shrinks.
If it is not possible to heat the inner
bearing ring, use the service tool
from set 5910 007 2222 to install
the crankcase. Do not remove the
oil pump for this purpose.
– Coat the straight stub of the
crankshaft with oil.
– Position the clutch side of the
crankcase on the straight
crankshaft stub and the two
screws.
– Screw the spindle fully into the
service tool.
: Screw the threaded sleeve (1)
5910 893 2202 onto the spindle
as far as stop
– left-hand thread.
165RA133 TG
1
: Apply the screw sleeve to the
crankshaft stub (arrow) and push
the service tool over the bar
studs.
: Hold the crankshaft (1) steady
and rotate the spindle (2) to
screw the screw sleeve onto the
crankshaft stub.
: Release the crankshaft (1). Hold
the service tool steady and
continue turning the spindle (2)
until the tool butts against the
crankcase.
– Fit the nuts on the collar studs
and screw them down finger-
tight.
: Turn the spindle (2)
counterclockwise until the
crankcase locates against the
guide sleeves.
1166RA082 TG
2
1166RA083 TG
1

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g