Stihl MS 661 C-M User Manual

27MS 661, MS 661 C-M
Take care not to damage the
crankshaft stub.
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
: Apply puller (1) 5910 890 4400
with No. 3.1 jaws 0000 893 3706,
clamp the puller arms and pull out
the oil seal.
Installing
– Clean the sealing face, b 16
– Lubricate sealing lips of new oil
seal with STIHL grease, b 16
: Fit the new oil seal (1) with the
sealing lip facing the crankcase.
: Use press sleeve (2)
1144 893 2400 to install the oil
seal (1).
1166RA046 TG
1
1166RA047 TG
2
1
The seating face must be flat and
free from burrs.
– Fit key in crankshaft stub.
– Clean the crankshaft stub
– the crankshaft taper must be
free from grease, b 16
– Reassemble all other parts in the
reverse sequence.
6.3.2 Clutch Side
– Remove the clutch, b 4.2
: Remove the retaining ring (1).
– Remove the oil pump, b 12.3
Take care not to damage the
crankshaft stub.
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
1
1166RA048 TG1166RA049 TG
1
: Apply puller (1) 5910 890 4400
with No. 3.1 jaws 0000 893 3706,
clamp the puller arms and pull out
the oil seal.
Installing
– Clean the sealing face.
– Lubricate sealing lips of new oil
seal with STIHL grease, b 16
: Fit the installing sleeve (1)
1144 893 4600 on the crankshaft
stub and slip the oil seal (2),
sealing lip facing the crankcase,
over the installing sleeve.
: Remove the installing sleeve (1).
: Use press sleeve (1)
1144 893 2400 to install the oil
seal (2) and then fit the retaining
ring.
– Reassemble all other parts in the
reverse sequence.
1166RA050 TG
2
1
1
1166RA051 TG
2

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