Stihl MS 231 User Manual

7MS 231, MS 231 C, MS 251, MS 251 C
Fastener Thread size For component Torque
Nm
Remarks
Screw P 4x12 Pre-separator / engine housing 2.0
Screw P 4x10 Elbow connector / air guide shroud 1.6
M 10x1 Spark plug / cylinder 12.0
Screw D 4x20 Ignition module/cylinder 4.
5 1), 3)
Screw D 5.3x41 Cylinder / engine housing 11.0
Remarks:
1) Screws with binding head
2) Micro-encapsulated screws
3) Waxed screws
4) Degrease crankshaft/flywheel and mount oil-free
Q) QuickStop Super
B) Quick chain adjuster
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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Stihl MS 231 Specifications

General

Power-to-Weight Ratio	2.4 kg/kW
Oilomatic Chain Pitch	3/8" P
Sound Pressure Level	103 dB(A)
Sound Power Level	114 dB(A)
Engine Power	2.0 kW
Weight	4.8 kg
Bar Length	35 cm / 40 cm
Fuel Capacity	390 cc
Chain Oil Capacity	200 ml
Vibration Level Left/Right	3.0/3.0 m/s²