LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 2021 >> M2 Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Electrical System - Tightening Torques (F87) >> 12 90 E-Box
April 5, 2026: LEMON Manuals is launched! Read the announcement.

12 90 E-Box

N55 ENGINE (2016-2018): 

12 90 ELECTRONICS BOX, WIRING HARNESS - TIGHTENING TORQUE SPECIFICATION

  Type Thread Tightening specifications Dimension
1AZ Cable channel to cylinder head cover N55/N55 Hybrid     8 Nm
2AZ Earth cable to crankcase lower section N55/N55 Hybrid M8 Replace aluminium screw.
Jointing torque Angle of rotation
8 Nm
45°
3AZ Earth cable to rear cylinder head N55/N55 Hybrid M6   8 Nm
4AZ Cable channel to engine block N55/N55 Hybrid M6 Replace aluminium screws. 8 Nm
5AZ Earth cable for ignition coils N55/N55 Hybrid     5 Nm

S55 ENGINE (2019-2022): 

12 90 ELECTRONICS BOX, WIRING HARNESS - TIGHTENING TORQUE SPECIFICATION

  Type Thread Tightening specifications Dimension
1AZ Cable channel to cylinder head cover S55     5 Nm
2AZ Wiring harness to cylinder head cover S55     5 Nm
3AZ Earth cable to rear cylinder head S55 M6   8 Nm
4AZ Cable channel to engine block S55 M8   19 Nm
5AZ Ground cable for ignition coils S55     4.6 Nm
6AZ Holder on intake plenum S55     4.5 Nm