Stihl 029, 039 - 1.6 Tightening Torques

STIHL 029, 039 6
1.6 Tightening Torques
"DG" screws are used in the polymer and light-alloy components of models 029 and 039. When screwed in for the
first time, DG screws form a permanent thread in the parts concerned. They can be released and retightened as often
as necessary without affecting the strength of the screwed assembly. However, it is essential to always use a torque
wrench to tighten the screws to the specified torques.
Fastener Thread For component Torque Remarks
size Nm (Ibf.ft)
Spline screw IS-DG4x15 Chain tensioner cover/
engine housing 3.2 (2.4)
Spline screw IS-DG4x15 Chain brake cover/
engine housing 3.2 (2.4)
Spline screw IS-DG4x15 Handle housing/handle molding 1.6 (1.2)
Spline screw IS-DG4x15 Oil pump 4.0 (3.0)
Spline screw IS-DG4x15 Shroud/engine housing 3.2 (2.4)
Spline screw IS-DG4x15 Ground wire to cylinder 4.0 (3.0)
Spline screw IS-DG5x16 Chain catcher/engine housing 3.5 (2.6)
Spline screw IS-DG5x16 Spiked bumper/engine housing 3.5 (2.6)
Spline screw IS-DG5x24 Front handle/handle housing 3.5 (2.6)
Spline screw IS-DG5x24 Hand guard (I/h) with sleeve 3.5 (2.6)
Spline screw IS-DG5x24 Fan housing/engine housing 3.5 (2.6)
Spline screw IS-DG5x24 Buffer/front handle 3.5 (2.6)
Spline screw IS-DG5x24 Buffer/engine housing 3.5 (2.6)
Spline screw IS-DG5x24 Ignition module/engine housing 4.8 (3.5)
Spline screw IS-DG6x52 Engine housing/cylinder 11.0 (8.1)
M12x1L Carrier (clutch) 50.0 (37.0)
Collar stud DG8x24 Guide bar 16.0 (11.8)
Collar stud M10x21 Guide bar/engine pan 30.0 (22.0) 1)
M14x1.25 Spark plug 25.0 (18.5)
Hexagon nut M5 Muffler 9.0 (6.6)
Hexagon nut M5 Box filter/carburetor 2.0 (1.5)
Hexagon nut M5 Carburetor with box filter 3.2 (2.4)
Hexagon nut M8x1 Flywheel 27.5 (20.3)
Use the following procedure to fit a DG screw in an existing thread:
- Place the DG 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.
Remarks:
1) Screw must be secured with adhesive 0786 110 0126 (Loctite 649).
Note: Screws secured with adhesive are easier to release if the adhesive is heated first with a hot air blower (hair
dryer). Exercise caution on polymer components.