Allroad Quattro V6-2.7L Turbo (BEL) (2003)
Valve Seat: Service and Repair
Valve seats, reworking (refacing)
Note:
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The valve seats should only be reworked just enough to produce a good seating pattern.
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Calculate the maximum permissible reworking dimension before reworking.
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If the reworking dimension is exceeded/ the function of the hydraulic lifters can no longer be guaranteed and the cylinder head should be replaced.
Calculating maximum permissible reworking dimension
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Insert valve and press firmly against valve seat.
Note: If the valve is to be renewed as part of a repair, use a new valve for the calculation.
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Measure distance between end of valve stem and top surface of cylinder head (illustration shows a 4-valve head).
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Calculate maximum permissible reworking dimension from measured distance and minimum dimension.