Remove carbon deposits on the valve guides with a cleaning reamer.
Insert new valve. The end of the valve stem must not protrude from the guide.
Caution: Due to different stem diameters, use inlet valves only in inlet guides and outlet valves only in outlet guides.
Using the linear displacement indicator, measure the value of the movement of the valve disc when it swings. VW/AUDI workshops use the VW 689/1 special tool for this. Inlet valve guide wear limit: 1.0 mm, exhaust valve guide: 1.3 mm.
If the travel is larger, have the valve guides replaced by a workshop.
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