Stihl MS 661 Manual page 8

Fastener Thread size For component
Screw M 5x20
Collar screw M 6x50
Screw M 5x20
Screw P 5x16
Screw M 5x16
Screw M 5x16
Screw P 5x16
Screw M 5x20
Screw M 4x12
Carrier M 13x1 L
Screw M 4x12
Screw M 4x10
Screw P 4x10
Screw P 4x10
Screw M 5x20
Screw M 5x30
Screw M 5x6
Screw M 4x12
Screw P 4x10
Nut M 10x1
Screw M 4x8
Screw M 3x20
Screw M 4x20
Stud M 5
Screw 6-32
UNCx11.5
Screw M 3x4.5
Collar nut M 5
Screw P 6x40
Screw M 5x16
M 14x1.25
Screw M 6x30
Remarks:
1) Loctite 242 or 243, medium strength
2) Loctite 270, high strength
3) Loctite 272, high strength up to 250°C
4) Screws with binding head
5) Micro-encapsulated screws
6) Waxed screws
7) Degrease crankshaft / flywheel and mount oil-free
W) Heated handles
V) Carburetor heating
MS 661, MS 661 C-M
Spiked bumper / crankcase, bottom
Spiked bumper / nut (chain catcher)
Crankcase, sprocket side/fan side
Bearing plug AS1 / crankcase
Bearing plug AS2 / handlebar
Bearing plug AS2 / cylinder
Bearing plug ZS3 / crankcase
Fan housing / crankcase
Fan housing / winter cover plate
Carrier / crankshaft
Oil pump / crankcase
Ground wire cable lug / crankcase
M-Tronic cable lug / handle housing
Heater cable lug / handle housing
Muffler / crankcase
Muffler / cylinder
Muffler casing, top
Switch unit / carburetor
Guard / handle housing
Flywheel / crankshaft
Side plate / crankcase
Manifold clamp / cylinder
Ignition module / control unit / crankcase
Stud / cylinder
Thermostatic switch / carburetor cover
Solenoid valve / carburetor
Carburetor
Elbow connector / handle housing
Elbow connector / handlebar
Spark plug
Cylinder / crankcase
Torque Remarks
Nm
8.0 5)
6.0 5)
10.0 4), 6)
4.0
6.0 4), 5)
10.0 4), 5)
4.0
7.0 4), 6)
2.0 5)
70.0
3.0 4), 5)
2.5 4), 5)
1.5
1.5 V, W
10.0 4), 5), 6)
10.0 3), 4), 6)
6.0 4), 5)
2.0 5)
1.5
45.0 7)
2.0 4)
0.5
4.0 5)
8.0 5)
1.1 V
0.7
3.5
6.0
7.0 4), 6)
25.0
15.0 4), 6)
7