Stihl MS 311 User Manual - Page 7

MS 311, MS 391 - bar size

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

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