5 Inlet and exhaust valves
⇒ “5.1 Checking valve guides”, page 119
⇒ “5.2 Reworking valve seats”, page 119
⇒ “5.3 Valve dimensions”, page 121
5.1 Checking valve guides
Special tools and workshop equipment required
♦ Universal dial gauge holder - VW 387-
♦ Dial gauge
Test sequence
– Insert new valve in guide. The end of the valve stem must be
flush with the guide. On account of differing stem diameters,
only
use inlet valve in inlet guide and exhaust valve in exhaust
guide.
– Determine rock. Wear limit: 0.8 mm
If the amount of sideways play is exceeded:
– Renew cylinder head.
5.2 Reworking valve seats
Special tools and workshop equipment required
♦ Depth gauge
♦ Valve seat refacing tool
Procedure
Note
♦
When repairing engines with leaking valves, it is not sufficient
to rework or renew valve seats and valves. Particularly on high
mileage engines, it is necessary also to check valve guides for
wear ⇒ page 119 .
♦
Valve seats are only to be reworked to the extent required to
yield a proper surface appearance. Before beginning to rework
valve seats, calculate the maximum permissible reworking di‐
mensions. If the reworking dimension is exceeded, the hy‐
draulic valve clearance compensation can no longer be
guaranteed and the cylinder head must be renewed.
CC 2012 ➤ , Passat 2011 ➤ , Passat Variant 2011 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 06.2019
5. Inlet and exhaust valves 119
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