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Home >> BMW >> 2018 >> M4 2D Convertible, Automatic DCT Trans >> Repair and Diagnosis >> General Information >> OEM General Information >> M4 Technical Data -- M4 (F82 & F83) >> Engine Mechanical >> 11 12 Cylinder Head

11 12 Cylinder Head

CYLINDER HEAD WITH LID SPECIFICATIONS

Cylinder head height: Original dimension mm 112.00 ± 0.05
Machining limit mm 111.70 ± 0.05
Valve guides are not available as replacement parts.    
Inner diameter of installed valve guide    
Original intake valve mm 5.00... 5.02
Original exhaust valve mm 6.00... 6.02
Tilt clearance, maximum (wear between valve and valve guide) mm cannot be measured
Bearing of camshaft    
Guide bearing (width) mm 22.00... 22.05
CYLINDER HEAD WITH VALVE SEAT COVER SPECIFICATIONS

Valve seat angle ° 45
Correction angle: outer ° 35
Correction angle: Inner, exhaust valve ° 60
Correction angle: Inner, intake valve ° 65
Valve seat width: Intake mm 1.5 +0.2
Valve seat width: Exhaust mm 1.65+0.2
ø theoretical valve seat    
Valve seat surface: Outside dia. inlet mm 30.4+0.1
Valve seat surface: Outside dia. exhaust mm 26.6+0.1
CYLINDER HEAD WITH LID SPECIFICATIONS

Cross deviation from flatness   
  max. 0.05 mm
Longitudinal deviation from flatness   
  max. 0.10 mm