S8 Quattro Sedan V8-4.2L (AYS) (2002)
Valve Guide: Testing and Inspection
Valve guides, checking
Special tools and equipment:
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Dial indicator bracket VW 387
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Dial indicator
CAUTION! Because of the difference in stem diameters, make sure that only an intake valve is used to check intake valve guides and that only an
exhaust valve is used to check exhaust valve guides.
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Install valve in valve guide so that end of valve stem is flush with end of guide.
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Measure amount of rock (axial play).
Wear limit
Notes:
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If the wear limit is exceeded, repeat measurement with new valves. If the measurement is again exceeded, replace cylinder head. Valve guides
cannot be replaced.
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If you intend to replace the valve, measure with new valve.
Valves, checking
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Carefully check valve for wear at stem and seat. Replace valve when worn.