Tightening Torques - Stihl 4180 Series Manual

3.4

Tightening Torques

DG and P (Plastoform) screws 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
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Collar nut
Socket head screw
Socket head screw
Socket head screw
Collar screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Socket head screw
Nut
Socket head screw
Socket head screw
Socket head screw
Series 4180 Powerhead
Thread size For component
IS-M6x25 Cover washer/clutch shoe/flywheel
IS-DG4x18 Cover/engine pan
IS-M5x30 Control handle/locknut with washer
IS-P4x16 Control handle, inner/outer moldings
IS-P4x16 Control handle, inner/outer moldings
IS-M5x12 Clamp/control handle
IS-DG4x18 Cover/cylinder
IS-M5x21 Filter cover/filter housing
M5 Filter housing/carburetor
IS-D5x24 Gear housing/drive tube
IS-M4x9.5 Screen/muffler
IS-M5x24 Shroud/cylinder
M5x16 Rocker lever collar screw/cylinder
IS-M6x30 Clamp/drive tube/handle support
M6x30 Coupling sleeve wingscrew
IS-M6x25 Coupling sleeve/nut, clamp
IS-DG5x24 Engine pan/cylinder
IS-M6x25 Clamp/loop handle/nut
IS-DG5x24 Fan housing/shroud/engine pan
IS-DG5x24 Fan housing/engine pan
P3.5x9 Detent spring/slide control
IS-M5x23 Loop handle/clamp/drive tube
IS-DG5x24 Muffler/crankshaft
IS-DG5x24 Muffler/cylinder
IS-M5x16 Cutting attachment deflector/gear housing
M8x1 Flywheel/crankshaft
IS-M6x14 Clamp/carrying ring
IS-M5x12 Clamp/drive tube, fan housing
IS-DG5x24 Starter cover/cover/engine pan
Torque
Nm
12.0
4.5
1)
2.0
1)
1.3
2)
1.3
2)
5.0
4.5
3.5
3.5
8.0
2.0
6.0
9.0
1)
8.0
3)
6.0
3)
9.0
9.0
2)
4.5
6.0
6.0
1)
1.1
4)
6.0
9.0
9.0
4.5
5)
17.0
4.5
6.0
6.0
5