11 12 595 Checking a valve guide for wear (M52 / S52 / M52TU / M54 / M56)

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(Valve removed)

To measure tilt clearance, install a new valve so that end of valve stem is flush with valve guide.

Attach dial gauge and measure tilt clearance.

Fig 1: Attaching Dial Gauge And Measure Tilt Clearance

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Max. permissible tilt clearance is 0.5 mm.

NOTE: If tilt clearance is excessive, valve guide is reamed out and a repair valve with a larger shaft diameter is installed.

Fig 2: Identifying Tilt Clearance

Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, ream valve guide, refer to 11 12 600 REAMING A VALVE GUIDE (M52 / S52 / M52TU / M54 / M56) .