Name: Stihl MS 251
Brand: Stihl
Rating: 5 (1 reviews)

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6 MS 231, MS 231 C, MS 251, MS 251 C

2.5 Tightening Torques

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

Remarks

Screw P 4x12 Chain tensioner cover 1.5

Screw P 5x18 Antivibration element / engine housing 4.0

Screw P 5x34 Antivibration element / tank housing 4.0

Screw P 4x12 Brake band/engine housing 2.0

Screw P 4x10 Brake cable retainer / tank housing 1.0 Q

Collar screw D 8x18 Collar stud for bar 16.0

Collar screw D 8x18 Collar stud for bar 16.0 B

Collar screw D 9x18 Collar stud for bar / engine housing

(repair solution)

16.0

Screw P 5x18 Cover, chain brake / engine housing 4.0

Nut M 5 Filter base / baffle / carburetor 3.5

Screw P 6x26.5 Handlebar / tank housing, right 6.0

Screw M 5x16 Handlebar / tank housing, bottom 5.0 2), 3)

Screw M 5x20 Hand guard / fan housing / engine housing 6.0 2)

Screw M 5x14 Shroud / engine housing 5.0

Screw P 5x16 Spiked bumper / engine housing 4.0

Screw D 4x12 Manifold / cylinder 4.0 1), 3)

Screw D 5x18 Bearing plug / cylinder 8.0 1), 3)

Screw P 5x18 Fan housing / engine housing 4.0

Screw P 4x12 Air baffle / engine housing 2.0

Carrier M 12x1 L Carrier / crankshaft 50.0

Screw P 6x28 Engine housing / bearing plug 6.0

Screw D 4x16 Oil pump 4.0 1), 3)

Screw M 5x16 Muffler / cylinder 10.0 2), 3)

Nut M 8x1 Flywheel / crankshaft 28.0 4)

Screw P 4x10 Retainer 1.0

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