The maximum permissible reworking dimension is calculated as follows:

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Insert valve and press firmly against seat.

NOTE: If the valve is to be replaced as part of a repair, use a new valve for the measuring.

Fig 1: Measuring Distance Between End Of Valve Stem And Upper Edge Of Cylinder Head

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Measure distance -a- between end of valve stem and upper edge of cylinder head.
Calculate max. permissible reworking dimension from measured distance -a- and minimum dimension.

Minimum dimensions:

Intake valve 33.8 mm
Exhaust valve 34.1 mm

Measured distance -a- minus minimum dimension = max. permissible reworking dimension.

Example:

-	Measured distance -a- Minimum dimension	35.1 34.1	mm mm
=	max. perm. rework dimension*	1.0	mm

*) Max. permissible reworking dimension is shown as dimension "b" in illustrations for reworking of valve seats.

Fig 2: Identifying Intake Valve Seat Measurements

Courtesy of VOLKSWAGEN UNITED STATES, INC.