Stihl 021 Service & Repair Manual

Online version - not for reprint
DG screws are used in the polymer and light-alloy 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 For component Torque Remarks
size Nm lbf.ft
Spline screw IS-DG4x15 Chain brake cover 2.0 1.5
Spline screw IS-DG4x15 Handle molding 1.6 1.2
Spline screw IS-DG4x15 Connector 2.5 1.8
(engine/oil pump)
Spline screw IS-DG4x15 Ground wire 3.5 2.6
(to cylinder)
Spline screw IS-DG5x24 Handle housing/ 3.5 2.6
front handle
Spline screw IS-DG5x24 Hand guard 3.5 2.6
Spline screw IS-DG5x24 Hand guard 3.7 2.8 1)
Spline screw IS-DG5x24 Fan housing 3.5 2.6
Spline screw IS-DG5x24 Buffer (to front handle) 3.5 2.6
Spline screw IS-DG5x24 Buffer (to engine) 3.5 2.6
Spline screw IS-DG5x24 Ignition module 4.0 3.0
(to engine housing)
Spline screw IS-DG5.3x40 Cylinder 9.5 7.0
(to engine housing)
Collar screw DG8x18 Guide bar mounting 16.0 11.8
Collar screw (rear) DG8x18 Guide bar mounting 8.0 5.9 3)
M12x1LCarrier(clutch)50.037.0
M14x1.25 Spark plug 25.0 18.5
Hexagon nut M5 Muffler 7.0 5.2
Hexagon nut M5 Filter housing/carburetor 2.7 2.0
Collar nut M8x1 Flywheel to crankshaft 28.0 21.0
M12x1.5 Decompression valve 14.0 10.3 2)
Slotted nut M5 Filter base/carburetor 2.0 1.5 1)
Spline screw IS-DG5x16 Spiked bumper 3.7 2.8
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 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,
which would weaken the assembly.
1) 023 L
2) On easy start version only
3) With quick chain adjuster
Note: Power screwdriver speed settings for polymer: Plastoform screws max. 600 rpm
DG screws max. 500 rpm
3.6 Tightening Torques
021, 023, 025 5

Stihl 021 Specifications

General

Brand	Stihl
Model	021
Category	Chainsaw
Language	English