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Home >> BMW >> 1997 >> 850Ci >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine - V12 (M73) >> Overhaul >> Cylinder Head >> Valve Guides

Valve Guides

  1. To measure tilt clearance, insert a NEW valve so valve stem end is flush with valve guide. Place dial indicator tip on side of valve head. Tilt valve from side to side to measure valve guide wear. Maximum permissible tilt is 0.020" (0.50 mm). If tilt clearance is excessive, ream valve guide and install a larger diameter valve. If necessary, ream out valve guide.
  2. Assemble reaming tool and guide taper from Reamer (00 4 210) depending on shaft diameter. Press guide taper against valve seat and ream out valve guide (when dry) from combustion chamber end. Rotate reaming tool once in downward direction.
    NOTE: After reaming operation, remachine valve seat. See VALVE SEATS  .
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