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Home >> BMW >> 2021 >> X4 M40i >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System -- Repair (G02) >> 12 31 Alternator >> 12 31 020 Removing and installing/replacing alternator (X4 xDrive30i 2022-2023) >> Installing the alternator

Installing the alternator

WARNING: Working on 12V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
TIGHTENING TORQUE SPECIFICATIONS

Alternator on component carrier 
M10x75 Tightening torque  38 Nm
M10x125 Tightening torque  38 Nm
M10x90 Tightening torque  38 Nm
G14192383Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Positive battery cable to the alternator 
M8 Tightening torque  19 Nm
G14192382Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Manifold bracket for intake air at cylinder head 
M6X16 Tightening torque  8 Nm
G14192381Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work