The maximum permissible refacing dimension is calculated as follows:

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen GTI, 2005 Volkswagen Jetta, 2005 Volkswagen GTI, 2004 Volkswagen Jetta, and 2004 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

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 calculation.

Fig 1: Measuring Gap Vertically Between Tip Of Valve Stem End And Upper Edge Of Cylinder Head

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Measure gap - a - vertically between tip of valve stem end and upper edge of cylinder head - 1 -.
Calculate max. permissible refacing dimension from measured distance and minimum dimension.

Minimum dimensions: Outer intake valve 34.0 mm, center intake valve 33.7 mm, exhaust valve 34.4 mm

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

Example:

	Measured distance	34.4 mm
-	Minimum dimension	34.0 mm
=	max. perm. rework dimension * See note	0.4 mm

* Maximum allowable refacing dimension is represented in illustrations for refacing valve seats as dimension "b".