Tightening Torques - Stihl MS 271 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
Screw
Screw
Screw
Screw
Collar screw
Collar screw
Collar screw
Collar screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Carrier
Screw
Screw
Nut
Screw
Collar nut
Collar nut
Collar nut
6
Thread size For component
P 4x12 Cover plate/chain sprocket cover
P 4x12 Chain tensioner cover/engine housing
P 4x14 Antivibration spring/engine housing
P 5x16 Antivibration spring/tank housing
P 4x12 Brake band/engine housing
P 4x10 Brake cable retainer/ tank housing
M 8 Collar screw/collar bushing
M 8/M 10 Collar stud for bar / engine housing
M 8/ D 8 Collar screw/engine housing
M 8/ D 9 Collar stud for bar / engine housing
(repair solution)
P 4x12 Cover, chain brake / engine housing
M 4x9.6 Spark arresting screen/muffler
P 6x32.5 Handlebar/tank housing
P 5x20 Hand guard/fan housing/engine housing
M 5x20 Hand guard/fan housing/engine housing
M 5x14 Shroud / engine housing
P 6x28 Chain catcher/engine housing/bearing plug
P 5x20 Spiked bumper / engine housing, top
P 5x20 Spiked bumper / engine housing, bottom
M 4x12 Manifold/cylinder
D 5x18 Bearing plug/cylinder
P 5x20 Fan housing / engine housing
P 4x12 Air baffle / engine housing
M 12x1 L Carrier / crankshaft
D 4x18 Oil pump/engine pan
D 5x18 Muffler / cylinder
M 8x1 Flywheel/crankshaft
P 4x12 Side plate/engine housing
M 5 Carburetor / collar screw, 1st stage, fan side
M 5 Carburetor / collar screw, 2nd stage, sprocket
side
M 5 Carburetor / collar screw, 3rd stage, fan side
Torque
Remarks
Nm
2.5 B
1.5
2.0
3.0
2.0
2.0 Q
30.0 1)
16.0 3)
16.0 B
16.0
1.5
1.0
7.0
4.0
8.0
5.0
6.0
4.0
4.0
3.0 2)
9.0 2)
4.0
2.0
50.0
4.0 2)
9.0 2)
28.0 4)
2.0
2.0
3.5
3.5
MS 271 C, MS 291 C