Tightening Torques - Stihl MS 311 Manual

2.5

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
Screw
Screw
Collar screw
Collar screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Carrier
Screw
Screw
Screw
Screw
Screw
Nut
Screw
Screw
Spark plug
Screw
6
Thread size For component
P 4x14 Chain tensioner cover/engine housing
P 4x12 Brake band/engine housing
M 10 Collar stud for bar / engine pan
D 8x24 Collar stud for bar / engine housing
P 5x16 Cover, chain brake / engine housing
M 10x1 Decompression valve
P 5x16 Handlebar/plug, AV spring
P 6x26.5 Handlebar / tank housing, right (polymer)
P 6x26.5 Handlebar / tank housing, bottom (polymer)
P 6x25 Hand guard / fan housing
M 6x30 Shroud / engine housing
P 6x38 Chain catcher / bearing plug
P 5x16 Spiked bumper / engine housing
M 4x12 Manifold/cylinder
P 6x21.5 Bearing plug / engine housing
M 5x16 Bearing plug/cylinder
P 5x20 Fan housing / engine housing
P 4x12 Air baffle / engine housing
M 12x1 LH Carrier / crankshaft
M 6x25 Engine housing / cylinder, stage 1
M 6x25 Engine housing / cylinder, stage 2
D 4x18 Oil pump
M 5x16 Muffler / cylinder
M 8x1 Flywheel/crankshaft
M 5 Carburetor/collar stud
P 4x14 Pre-separator / engine housing
P 4x12 Cover plate/fan housing
M 14x1.25 Spark plug
D 4x18 Ignition module / engine pan
Torque Remarks
Nm
1.5
2.0
30.0 1)
16.0
4.0
14.0
3.0
7.0
7.0
8.0
10.0
6.0
4.0
4.0 3)
6.0
10.0 4)
4.0
2.0
50.0
4.0 3)
12.0 3)
4.0 3)
10.0 1) 3)
33.0 5)
3.5
2.0
2.0
25.0
4.0 3)
MS 311, MS 391