FOX 2004 ➤
3 - Cyl. injection engine - Edition 12.2009
Grind exhaust valve seats
a
b
c
= Ø26.6 mm
= max. trimming specification allowed
= max. 1.8...2.0 mm
Z
a
ß
?
= Lower cylinder head edge
= 45° Valve seat angle
= 30° Upper correction angle
= 60° Lower correction angle
4) Calculating maximum grinding measurement allowed ⇒ page 40 .
2.4
Valve guides - check
Special tools and workshop equipment required
♦ Centesimal dial gauge
♦ Support -VW 387-
lk
Test sequence
– Place a new valve on the guide. Valve end shall be aligned
with guide. Due to the various valve guide diameters, we rec‐
ommend using only one intake valve on intake guide and one
exhaust valve on escape guide.
– Measure tilting clearence. Wear limit: 0.8 mm.
In case the clearance is exceeded:
– Replace engine cylinder head.
42
Rep. Gr.15 - Cylinder head, valve control mechanism
English 
