ESP AUDI A6 1995 C5 / 2.G AHA ATQ Engines Valve Gear Service Manual

15-52

Valve guides, checking

When servicing engines or cylinder heads with
leaking valves, refacing or replacing valve seats
and valves is not sufficient. Valve guides must be
checked for wear. This is especially important for
engines with high mileage.

Wear limit - Insert valve into guide.
Valve shaft edge must seal with guide. Due to differences in valve stem
diameter, make sure only intake valves are used to check intake
guides, and only exhaust valves are used to check exhaust guides.
- Measure axial play.Intake valve guide
Exhaust valve guide
0.8 mm (0.031 in.) 0.8 mm (0.031 in.) - If wear limit is exceeded, replace cylinder head.
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