Touareg 2003 ➤
8-cylinder injection engine - Edition 11.2011
♦ Universal dial gauge bracket -VW 387-
♦ Dial gauge
Test procedure
– Insert new valve into guide. The end of the valve stem must
be flush with the guide. On account of differing stem diame‐
ters, only use inlet valve in inlet guide and exhaust valve in
exhaust guide.
– Determine rock. Wear limit: 0.8 mm
lk
If rock tolerance is exceeded:
– Renew cylinder head.
2.8
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 65 .
♦ 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.
– Remove camshafts ⇒ page 56 .
The max. permissible reworking dimension is calculated as fol‐
lows:
– Insert valve and press firmly against seat.
66
Rep. gr.15 - Cylinder head, valve gear
English 