Stihl MS 661 C-M User Manual

33MS 661, MS 661 C-M
Ignition side of crankcase
Take care not to damage the
crankshaft stub.
– Heat the inner bearing race to
about 160°C
(320°F).
: Position the tapered stub of the
crankshaft (arrow) above the ball
bearing at the ignition side and
push it home.
This operation must be carried out
very quickly because heat is
absorbed by the crankshaft, and the
inner bearing race shrinks.
1166RA077 TG
If it is not possible to heat the inner
bearing race, use service tool
5910 007 2101 to install the
crankshaft – use plate
5910 893 2101.
: Screw the threaded sleeve (1)
5910 893 2421 onto the spindle
as far as stop.
Coat tapered stub of crankshaft with
oil.
– Position the tapered stub of the
crankshaft above the ball bearing
at the ignition side and push it
home.
: Position the screw sleeve (2)
5910 893 2421 on the crankshaft
thread (1) and screw it into place.
3443RA111 TG
1
1
2
1166RA069 TG
: Turn the spindle (1) to position
the drilled plate 5910 893 2101
against the ignition side of the
crankcase and line it up so that
the number "31" is at the bottom.
: Insert two M5x72 screws (2) in
the holes marked "31" and the
crankcase and tighten them
down.
: Turn the spindle (1) clockwise.
– Install the ignition side of the
crankcase as far as stop.
The crankshaft turns when it is
being pulled into place with the
service tool. Therefore, make sure
the small end (3) of the connecting
rod always points upward to the
cylinder.
– Remove the installing tool.
31
1
1166RA078 TG
2
2
3

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