![background image](http://html1.mh-extra.com/html/stihl/029-039/029-039_service-manual_1378802006.webp)
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.