A6 Quattro Sedan V8-4.2L (ART) (2000)
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, always use an intake valve to check intake valve guides and only use an exhaust valve 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
Note:
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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.