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"Cylinder head, checking for cracks

When repairing cylinder heads, small cracks in head between valve seats or
valve seats and spark plug threads (where applicable) are permissable.

Cylinder heads showing such cracks can be reused without reducing engine
service life or performance, providing cracks are small.

a+ 0.5 mm (o.019 in.)

Cracks in spark plug threads (where applicable) may not be longer than
through the first coil of threads."

Included is a diagram showing a crack between valves dimensioned by 'a' and
NOT extending into the valve seats.

It would seem that in order for a crack to extend from that location and
continue through the head it would have to become larger than the specified
dimension thereby becoming unserviceable (or requiring repair). The 'surface
crack' translation is probably quite accurate and is defined by the maximum
dimension above.

BTW you refer to your 89 turbo quattro avant as a 100 - I assume that you
are playing sneaky with others on the road and driving a stealthy
underbadged 200TQA rocket? Bet you didn't change the headlights to the
non-turbo style ;-)

Peter Berrevoets
1990 200TQ
Toronto, Canada