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