2021 BMW M2 Automatic DCT TransFACTORY OEM SERVICE PROCEDURE

11 11 Engine Block

N55 ENGINE (2016-2018): 

11 11 ENGINE BLOCK - TIGHTENING TORQUE SPECIFICATION

  Type Thread Tightening specification Measure
1AZ Main bearing bolts (steel bolts 10.9) N55 M10x100 Replace screws
Jointing torque Torque angle		 20 Nm
70°
2AZ Bedplate
Aluminium screws/bolts		 N55 M10x27 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.
Jointing torque
Torque angle		 15 Nm
90°
3AZ Bedplate
Aluminium screws/bolts		 N55 M8x37 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.
Jointing torque
Torque angle		 8 Nm
90°
4AZ Bedplate
Aluminium screws/bolts are marked with blue paint.		 N55 M10x41 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.
Jointing torque
Torque angle		 15 Nm
90°
5AZ Oil spray nozzles to engine block N55   Hollow bolt 12 Nm
6AZ Screw plug, coolant drain plug N55 M14x1.5 Replace screw with sealing ring 25 Nm
7AZ Screw plug, timing case upper section N55 M22x1.5 Replace screw with sealing ring 50 Nm
8AZ Screw plug, timing case upper section N55 M33x1.5 Replace screw with sealing ring 50 Nm
9AZ Screw plug, timing case lower section N55 M16x1.5 Replace screw with sealing ring 27 Nm

S55 ENGINE (2019-2022): 

11 11 ENGINE BLOCK - TIGHTENING TORQUE SPECIFICATION

  Type Thread Tightening specifications Dimension
1AZ Main bearing bolts (steel bolts 10.9) S55 M10x100 Replace screws
Observe tightening sequence
Jointing torque		 20 Nm
Angle of rotation 70°
2AZ Bedplate
Aluminium screws.		 S55 M10x27 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.
Jointing torque		 15 Nm
Angle of rotation 45°
3AZ Bedplate
Aluminium screws.		 S55 M8x37 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.
Jointing torque		 8 Nm
Angle of rotation 90°
4AZ Bedplate
Aluminium screws are marked with blue color.		 S55 M10x41 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.		  
Jointing torque 15 Nm
Angle of rotation 90°
5AZ Oil spray nozzles to engine block S55   Hollow bolt 12 Nm
6AZ Screw plug, gear case upper section S55 M22x1.5 Replace screw with sealing ring 50 Nm
7AZ Screw plug, gear case lower section S55 M16x1.5 Replace screw with sealing ring 27 Nm
8AZ Transmission cover plate to crankcase S55 M6x16 Replace screws
Thread repairs exclusively with Al Helicoil.
Jointing torque and angle of rotation must be observed without fail.		  
      Jointing torque 4 Nm
Angle of rotation 90°
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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