5Series 4144 Powerhead
3.3 Tightening Torquese
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.
Fastener Thread size For component Torque
Nm
Remarks
Screw UNC 8-32 Clutch drum/crankshaft 3,5
Carrier 3/8“ -24 Carrier, clutch/crankshaft 20,0 5)
Carrier M 8x1 Carrier, starter side/crankshaft 17,0
Screw D 5x20 Muffler/cylinder 9,0
Screw D 5x20 Spacer flange/cylinder 6,0
Screw D 4x20 Ignition module/cylinder with washer 4,5
M 10x1 Spark plug 12,0
Screw D 5x60 Engine pan/crankcase/cylinder 9,0
Remarks:
1) Loctite 242 or 243, medium strength
2) Loctite 270, high strength
3) Loctite 649, high strength
4) Loctite 272, high strength up to 250°C
5) Degrease crankshaft/flywheel and mount oil-free
Use the following procedure when refitting a DG or P 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 assembly.
Coat micro-encapsulated screws with medium strength Loctite 242 or 243 before reinstalling.
Power screwdriver setting for polymer: DG and P 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.
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