Skoda FABIA 2000 Workshop Manual page 62

15
∅ Mill-
Valve seat
ing cut-
ter 90°
Inlet valve
Exhaust valve
Milling sequence
1 - Machine valve seat with 90° milling tool until until a
perfect contact pattern is achieved. (Do not exceed
maximum permissible reworking dimension!)
2 - Chamfer top correction angle with 120° milling cut-
ter until the valve seat diameter -a- (⇒ 15-2
page 5) is achieved.
3 - Mill bottom correction angle with 60° milling cutter
until valve seat width -c- (⇒ 15-2 page 5) is
achieved.
–
Grind in valve/valve seat -arrows- with fine grinding
paste so as to achieve a perfect contact pattern.
–
Check contact pattern e.g. with water colour (perfect
contact pattern over entire circumference).
–
Install valve springs.
–
Check valves for tightness.
The tightness of the valves can be checked by filling pet-
rol into the inlet and outlet canal (no petrol must flow out
at the valve seat)
After completing the repair measure once again the dis-
tances between the valve stem ends and the upper face
of the cylinder head and calculate the maximum permis-
sible reworking dimension ⇒ 15-2 page 4.
Note
If the maximum permissible reworking dimension is ex-
ceeded, proper operation of the valve gear is no longer
assured and the cylinder head must be replaced.
Replacing camshaft gasket rings
Special tools, test and measuring equipment and
auxiliary items required
♦
Supporting device -MP 9-200-
♦ Pressure pad -T 30004- with replaceable stud
-T 30004/1-
♦ Inserting device -T 10015-
♦
Camshaft lock -T 10016-
♦
Gasket ring extractor -T 10018-
15-2 6
page
∅ Milling ∅ Mill-
cutter ing cut-
120° ter 60°
mm mm
32 32 21/34
30 30 21/34
Repairing Valve Gear
FABIA 2000 1.4/55; 1.4/74 Engine - Mechanical Components
mm
1.
2.
3.
90°
120°
a
60°
S15-0062
S15-0063
Edition 05.05
S00.5306.06.20