4 BR 500, BR 550, BR 600
3.4 Tightening Torques
DG and P (Plastoform) screws are used in polymer and lightmetal 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
lbf.ft Nm
Screw IS-P5x18 Shroud/filter housing/fan housing 3.0 4.0
Screw IS-P5x18 Shroud/fan housing 3.0 4.0
Collar screw IS-M5x16 Collar screw/cylinder/rocker arm
mounting 6.6 9.0 1)
Screw IS-DG5x16 Cover/cylinder 3.0 4.0
Screw IS-M5x21 Filter cover/filter housing 3.0 4.0
Screw IS-M5x48x22 Filter housing/carburetor/flange 4.4 6.0
Screw IS-P5x18 Fan housing, outer/inner 3.0 4.0
Screw IS-D6x32 Fan housing, inner/engine pan 8.8 12.0
Screw IS-D6x32 Fan housing, inner/cylinder 8.8 12.0
Hub IS-M12x1 Fanwheel/crankshaft 22.0 30.0 2)
Screw IS-P4x19 Handle molding, outer/inner 1.1 1.5
Screw IS-P6x21.5 Handle moldings/blower tube 3.0 4.0
Screw IS-M4x9.5 Scoop/muffler 3.0 4.0
Screw IS-M6x30 Engine pan/cylinder, initial stage 3.0 4.0 3)
Screw IS-M6x30 Engine pan/cylinder, final stage 8.8 12.0 3)
Screw IS-DG5x24 Air guide shroud/fan housing 3.0 4.0
Screw IS-DG5x24 Air guide shroud/engine pan 4.4 6.0
Screw IS-P4x19 Detent spring/handle molding, inner 1.1 1.5
Screw IS-P6x25 Backplate/bearing plug 4.4 6.0
Screw IS-P6x25 Backplate/tank housing 4.4 6.0
Screw IS-M5x18 Muffler/cylinder 5.9 8.0
Screw IS-P6x21.5 Hose clip/blower attachment 3.0 4.0
Nut IS-M8x1 Flywheel/crankshaft 15.0 20.0
Locknut IS-M5 Rocker arm mounting
Screw IS-M5x18 Starter cover/shroud/engine pan 4.4 6.0
Screw IS-M5x18 Starter cover/shroud/cylinder 4.4 6.0
Remarks:
1) Install with high-strength Loctite 270
2) Do not lubricate with grease
3) Tighten in crosswise pattern
RA_452_00_01_02.book Seite 4 Donnerstag, 16. Februar 2012 11:52 11
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