100CS Quattro Wagon V6-2.8L (AAH) (1992)
Valve: Testing and Inspection
CHECKING
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Inspect visually for scoring on valve stem and valve seat surfaces.
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If clear signs of wear are present replace valves.
REFACING INTAKE VALVE
45°
a - max 3.5 mm (0.138 in.)
b - min. 0.5 mm (0.020 in.)
REFACING EXHAUST VALVES
NOTE
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Valves must not be refaced by cutting or grinding.
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Only lapping is permitted.
SCRAPING EXHAUST VALVES
WARNING!
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Worn sodium-filled exhaust valves must not be scrapped without properly disposing of the sodium.
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The valves must be cut into two parts with a hacksaw between the center of the valve stem and the valve head. They must not come
into contact with water when being cut open.
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After cutting the valves:
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Throw the valves, not more than ten at a time, into a bucket filled with water and STAND BACK.
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A sudden chemical reaction occurs as the sodium comes into contact with the water.
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Valves that have been processed in this way can then be disposed of in the normal waste.