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Home >> BMW >> 2021 >> 840i 2D Convertible >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Cylinder Head -- Repair (G14, G15, & G16) (2 Of 7) >> 11 12 Cylinder Head >> 11 12 106 Removing and installing right cylinder head (M850i xDrive coupe) >> Installing the right cylinder head

Installing the right cylinder head

CAUTION: Heavy component. 
Heavy components can lead to injury or damage. 
  • Remove and install heavy components with the aid of another person/other persons.
CAUTION: Swirling dirt particles caused by compressed air. 
Injury hazard! 
  • Collect dirt particles, e.g. when blowing out, use cloth to do so.
  • Wear safety goggles.
NOTE: RISK OF DAMAGE 
Damage to guide rails. 
The application of great force can damage the guide rails of the timing chain. 
  • When removing and installing the cylinder head, make sure that the cylinder head does not damage the guide rail.
NOTE: RISK OF DAMAGE 
Damage to the surface. 
The use of metal-cutting tools (e.g., emery cloths) for cleaning surfaces can damage them and lead to leaks and/or engine damage. 
  • Do not use any metal-cutting tools.
NOTE: TECHNICAL INFORMATION 
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.
G14252131Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: TECHNICAL INFORMATION 
The work must be performed with vehicle care to prevent component damage.
G14252130Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: TECHNICAL INFORMATION 
The work must be performed with vehicle care to prevent component damage.

Tightening right cylinder head 

Tightening the right cylinder head 

Fig 1: Right Cylinder Head Screws Tightening Sequence
G14252143Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Cylinder head bolt
M11
Replace screws.
Joining torque  30 Nm
1. Angle of rotation  90°
2. Angle of rotation  140°
TIGHTENING TORQUE SPECIFICATIONS

Cylinder head bolt to timing case cover
M8x30 tightening torque  23 Nm
G14252014Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Slide rail to cylinder head
Bearing screw Tightening torque  25 Nm
G14252128Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUE SPECIFICATIONS

Heat protection plate
M6x16 tightening torque  10 Nm
G14252125Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work