mileage AUDI TT 1999 8N / 1.G AEB ATW Engines Valvetrain Servicing Workshop Manual

15-71

Valve seats, refacing


Note:
If a perfect contact pattern isn't obtained after
hand lapping valves, reface valve seats.

Special tools and equipment

Depth gauge
Valve seat refacing tool

Note:
When servicing engines with low compression
due to leaking valves, it is not sufficient to
reface or replace the valve seats and valves. It
is especially important to check valve guides for
signs of wear on high-mileage engines Page 15
-66
.

Only reface valve seats enough until a perfect
contact pattern is obtained.
Before refacing, determine maximum refacing
dimension.
If refaced dimension is exceeded, hydraulic
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