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Home >> BMW >> 2019 >> X3 M40i >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Assembly, Cylinder Head -- Repair (G01) >> 11 12 Cylinder Head With Lid >> 11 12 100 Removing and installing cylinder head (X3 4-cyl. models except PHEV, 2018-2019) >> Removing the cylinder head

Removing the cylinder head

WARNING: Working on 12 V 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.
WARNING: Working on fuel system. 
Risk of fire! Danger of explosion! 
  • When working on the fuel system, make sure the workstation has sufficient ventilation, e.g., by means of extraction.
  • Tightly seal off open lines and connections; collect any leakage fuel directly at the point of exit.
  • No fire, sparks, open flames or smoking.

Preliminary work 

CAUTION: On releasing high pressure line, fuel may emerge at high speed. 
Injury hazard! 
  • Wear suitable personal protective equipment.
  • Before performing any installation work, allow cooling system to cool down to less than 40°C.
  • Note warnings on cylinder head cover.
NOTE: RISK OF DAMAGE 
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS). 
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults. 
  • Detach battery terminal from battery pole. Do not pry off using a tool.
NOTE: RISK OF DAMAGE 
Engine damage due to missing motor oil. 
Missing motor oil following replacement of the cylinder head or the engine can lead to damage on the valve train. 
  • After replacing the cylinder head or the engine, do not start the engine without observing the repair notes.
  • It is imperative you observe the repair notes for cylinder head or engine replacement.
  • For ADDITIONAL INFORMATION , see: Repair notes for cylinder head or engine replacement
NOTE: TECHNICAL INFORMATION 
After replacing the motor or cylinder head: Reprogram or encode the digital motor electronics (DME) if necessary.
Read out the vehicle I-level and proceed accordingly.
Be absolutely certain to pay attention to PuMA measure 62634754.
For further information, see the applicable BMW Parts Catalog.
NOTE: TECHNICAL INFORMATION 
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.
NOTE: The figure shows the engine B38.
G12700769Courtesy of BMW OF NORTH AMERICA, INC.