Common tightening torques Rotax 912 / 914 for repairs

The following tightening torques apply to standard bolts and nuts on Rotax engines:

The part numbers and size of the copper sealing rings used can be found here:
part numbers of the copper sealing rings

Mounting locationDesignationTightening torque NmLoctiteComment
Cylinder head

Tightening sequence
See image below		M8 nut1. - Degrease all threads
2. - Grease only the contact surfaces of the cap nuts
3. - Tighten in a screwing sequence with 10 Nm
4. - Tighten in a screwing sequence with 30 Nm
5. - Loosen nuts individually by 360°
6. - finally tighten with 10 Nm + 150°
The installation and tightening of a single cylinder head or a single cylinder head nut is not permitted.
The entire procedure for tightening the cylinder heads must be carried out in the torque sequence.		 New tightening instructions for all engines.

Replaces all previous tightening instructions !

See:
SI-912-025
SI-914-026
SI-912 i-010„
cylinder headnut M822 up to housing S/N: 27811
cylinder headnut M810 Nm + 120° from housing S/N: 06.0010
cylinder headspark plugs20 (NGK / ND)
16 (BRP)		insert with silicone
thermal paste		see:
SI-912-027
SI-912 i-013
SI-914-028
motor housingCONNECTING SCREW M16X1.535243
motor housingbanjo bolt M16 X 1.530 oil pressure line
Motor housingscrew connection 3/4-16 UNF/ M16 X 1.525243oil pressure line
motor housingMAGNETIC SCREW M12X1.525
motor housinglocking screw blocking pin
CYL.SCREW M8X20		15 with copper sealing ring
freewheel housingSK-NUT M34X1.5 HEIGHT 8150603
drive wheelSK-NUT M30X1.5 HOEHE 12200648
Intake manifoldSK-BOLT M8X3015243
Exhaust stud boltSK SCREW M8X23/206648
Water pumpWHEEL15243
Solenoid wheelSK SCREW M16X1.5×40originally 150 Nm
45 Nm + 180°		Fit the cone of the solenoid hub with Loctite 603 !
Ignition coverSK SCREW M6X165243
Ignition coil holder frontCYL.SCREW M8X1625243with bracket
Fuel pump capSK SCREW M815243914 / 912 iS
Oil pump screw plug M12X125Oil pressure control valve
oil pumpHOSE NIP 13.2/9.515243
oil pumpscrew gland25648
oil pumpoil pressure sensor15243cellar sensor
oil pumpbanjo bolt M10 x 1 x 19 / 3012 pressure oil lines (also on regulator flange)
oil pumpCONNECTING SCREW M10X110243connection for pressure oil line
oil pumpoil filter nipple60screw on oil filter
oil reservoirdrain plug
SK-SCREW M12X12		25 with sealing ring P/N 250010
oil reservoirpipe bend / hose connection
union nut		25 hold against with open-end wrench on\\oil reservoir cover
oil reservoirbanjo bolt M10X1X1917 oil return 914 from\\oil pump
oil pump/cylinder headTEMPERATURE SENSOR10243
propeller shaft bearingSK-SCREW M7X1615243in the gearbox housing
fuel linesbanjo bolt M8X110 on carburetor
fuel linesbanjo bolt M10X115 914
AirboxTEMPERATURE SENSOR15243
fuel pumpSK-NUT M815243
float chamber coverCONNECTION SCREW5.5 only 914
Fuel line on the carburetorSREWED-IN SCREW10243
turbo oil linevalve housing25
turbo oil linebanjo bolt M8X1X1710 marked with „OIL“
oil sump tank
only 914		locking screw with strainer20 also 915 and 916
carbon brush holder starter motorCOMBINUT M64
Magnetic hubPrerotator drive140648AutoGyro

Fit the cylinder head and bumpers. To do this, lift the cylinder into the centering of the head,
Grease the contact surface of the flanged cap nuts.
Screw on the collar nuts and collar cap nuts.
Tighten the collar nuts evenly and lightly (do not exceed 10 Nm!) until the cylinder head rests on the cylinder.
Align the cylinder heads with the fixture provided and tighten the nuts to 10 Nm according to the screw sequence and then to 30 Nm according to the screw sequence.
Loosen each screw point individually by 360°, retighten with 10 Nm and a rotation angle of 150°.