Tightening Torques - Stihl MS 650 Manual

3.5

Tightening Torques

DG and P screws (Plastoform) are used in polymer and light metal components. These screws form a permanent
thread when they are installed for the first time. They can be removed and installed as often as necessary
without impairing the strength of the screwed assembly, providing the specified tightening torque is observed.
For this reason it is essential to use a torque wrench.
Fastener Thread size
Screw IS-M4x8
Starter post M8
Screw M8x21.5
Screw IS-M4x12
M10x 1
Screw M4x10
Nut M5
Twist lock M5
Screw IS-M4x12
Screw IS-P6x21.5
Screw IS-P6x19
Screw IS-P6x19
Screw IS-P4x19
Screw IS-M4x 8
Screw IS-M5x40x25
Screw IS-M5x16
Screw IS-M5
Screw IS-M5x20
Screw M5x12
Screw IS-M5
Screw IS-M5x20
Remarks:
1) Loctite 243, medium strength
6
For component
Chain tensioner cover plate
Starter post in fan housing
Collar screw for guide bar
Chain brake cover
Decompression valve or plug
Spring housing/fan housing
Flange on filter base
Filter cover
Generator (for carburetor/handle
heating only)
Front handle, top, with stiffener
(not wrap-around handle)
Front handle, top (wrap-around handle)
Front handle, bottom
Handle molding
Rubber buffer/crankcase
Hand guard, left
Shroud/crankcase
Chain catcher/spiked bumper (with
wrap-around handle)
Chain catcher/spiked bumper/
crankcase
Spiked bumper/crankcase, top with nut
Chain sprocket cover/spiked bumper
Crankcase/oil tank housing
Torque Remarks
Nm
3.0
12.0
23.0 1)
3.0
14
2.5
2.0
1.0
3.5 1)
7.0
7.0
7.0
1.6
3.5
7.0
7.0
6.0
9.0
7.5
6.0
11.5
MS 650, MS 660