11 12 600 Reaming a valve guide (M52 / S52 / M52TU / M54 / M56)

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Special tools required:

NOTE: For special tools, refer to ENGINE - SPECIAL TOOLS .

00 4 210

(Valve removed)

NOTE: In event of excessive clearance between valve stem and valve guide: Valve guide is reamed and a repair valve with a larger stem diameter is installed.

Assemble reaming tool and guide taper (1) from special tool kit 00 4 210 depending on stem diameter. Press guide taper (1) onto valve seat. Starting from combustion chamber side, ream valve guide dry. Rotate reaming tool once in downwards direction.

Fig 1: Identifying Reaming Tool And Guide Taper

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Remachine valve seat after reaming.