Tightening Torques - Stihl FS 94 Instruction Manual

2.4

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.
Use the following procedure when refitting a DG or P screw in an existing thread:
Insert the screw in the hole and rotate it counterclockwise until it drops down slightly and engages in the existing
thread. Tighten the screw clockwise to the specified torque.
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread
and weaken the assembly.
Micro-encapsulated screws and screws coated with threadlocking adhesive:
Before re-installing, clean both threads (screw tap into female thread by hand and then blow out with
compressed air; clean male thread with brush), coat micro-encapsulated screws with medium-strength Loctite
242 or 243, and screws previously coated with threadlocking adhesive with Loctite (see list of screws below).
Power screwdriver setting for polymer: P and DG screws max. 500 rpm.
Do not use an impact wrench for releasing or tightening screws.
Do not mix up screws with and without binding heads.
Fastener
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Nut
Screw
Screw
Screw
Screw
Screw
Screw
Screw
Carrier
Screw
Nut
Nut
Series 4149 Powerhead
Thread size For component
M 5x12 Cover / shroud
D 5x24 Rewind starter / shroud / cylinder
D 5x24 Rewind starter / tank housing / crankcase
P 4x16 Control handle molding, outer / inner
M 5x12 Control handle clamp/shaft
P 4x10 Control handle, throttle set wheel / lever /
inner handle molding
M 5x12 Filter cover / filter housing
M 5 Filter housing / carburetor
D 5x12 Sleeve, anti-vibration / drive tube
M 5x20 Sleeve, anti-vibration clamp screw
M 6x25 Clutch / flywheel
D 5x24 Crankcase / cylinder
D 5x24 Crankcase, flywheel side / crankcase, starter
side
D 5x24 Fan housing / shroud / crankcase
D 5x24 Fan housing / crankcase
M 8x1 Carrier / crankshaft
D 5x20 Muffler / cylinder
M 6 Flywheel / crankshaft
M 8 Flywheel / crankshaft
Torque Remarks
Nm
5.0 1), 2)
6.0 1), 2)
6.0 1), 2)
1.3 1), 2)
5.0 1), 2)
1.3
5.0
3.5
5)
5.5 1), 2)
12.0
8.0 1), 2)
8.0 1), 2)
6.0 1), 2)
6.0 1). 2)
17,0
8,0 1). 2)
12.0 4)
16.0 4)
5