Tightening Torques - Stihl BT 45 Manual

3.3

Tightening Torques

DG and P (Plastoform) screws are used in polymer and lightmetal 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
Screw
Screw
Screw
Fastening nut
Screw
Screw
Screw
Screw
Screw
Nut
Nut
Remarks:
1) Install screw with medium-strength Loctite 243
BT 45
Thread size For component
M14x7 Stub/muffler
IS-DG5x24 Spacer flange/cylinder
IS-DG5x20Z Fan housing/spiral housing
IS-DG5x24 Spiral housing/crankcase
IS-DG5x24 Spiral housing/engine pan
IS-DG5x20Z Fan housing/spiral housing
M4x8 Guide plate/gear housing
IS-DG5x60 Muffler/cylinder
M6x25LH Lock screw, chuck/output shaft
1/2"-20 Chuck/output shaft
IS-P4x14 Rotary knob/driver, gearbox
M5 Filter cover/handle housing/screw
IS-DG5x20 Gear housing, right/left
IS-DG5x24 Gear housing/crankcase
IS-DG5x24 Gear housing/engine pan
IS-DG5x24 Handle housing, left/right
IS-DG5x16 Shroud/gearbox
M5 Manifold/carburetor/flange/screw
M8x1.25L Carrier/crankshaft
M12x1.25 Friction clutch
M14x1.25 Spark plug
Torque Remarks
lbf.ft Nm
7.5 10.0
4.4 6.0
4.4 6.0
4.4 6.0
4.4 6.0
4.4 6.0
3.0 4.0
6.6 9.0
7.5 10.0
26 35.0 1)
0.75 1.0
1.5 2.0
5.9 8.0
5.9 8.0
5.9 8.0
2.6 3.5
2.6 3.5
2.6 3.5
12.5 17.0
10.5 14.0
15 20.0
5