Tightening Torques - Stihl 019 T User Manual

2.6

Tightening Torques

Plastoform screws are used for polymer components and "DG" screws for 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 detrimentally affecting 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
Spline screw IS-DG 4x20
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Spline screw IS-DG 5x24
Collar screw IS-DG 8x18
Spline screw IS-M5x52
Collar nut M8x1
M12x1 L
M14x1.25
Plastoform screw IS-P4x12
Screw IS-DG 3.5x12
Use the following procedure when refitting a P or DG screw in an existing thread:
- Place the screw in the hole and rotate it counterclockwise until it drops down slightly.
- 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 joint.
Note: Power screwdriver speed for use in polymer: Plastoform screws max. 600 rpm,
Use only screws specified in parts list.
Do not use screws with underhead locking teeth on polymer components.
STIHL 019 T
For component
Ignition module/cylinder
Handle molding/front handle
Fan housing/engine housing
Engine pan/cylinder
Handle molding/handle
Muffler/cylinder
Spacer flange/cylinder
Engine housing/cylinder
Bar mounting/engine housing
Intake casing/carburetor/flange
Flywheel
Clutch
Spark plug
Hand guard, left/fan housing
Support plate /diaphragm/
spacer flange
DG screws max. 500 rpm.
Torque Remarks
Nm Ibf.ft
4.5 3.3
3.5 2.6
4.0 3.0
8.0 5.9
4.0 3.0
7.0 5.2
8.0 5.9
8.0 5.9
16.0 11.8
5.0 3.7
28.0 21.0
50.0 37.0
25.0 18.5
1.7 1.3
2.0 1.5
5