Reworking Valve Seats - Skoda FABIA 2000 Workshop Manual

FABIA 2000 1.0/37; 1.4/44; 1.4/50 Engine, Mechanical Components
Valve dimensions
Note
Valves must not be reworked. Only grinding in is permis-
sible.
Inlet valve
Dimension 1.0 ltr
∅ a
mm 34,0
∅ b
mm 7,0
c mm 104,0
α ∠°
45

Reworking valve seats

Special tools, test and measuring equipment and
auxiliary items required
♦
Depth gauge/caliper gauge
♦ NAC milling cutter for reworking valve seats
♦ Grinding paste
Note
♦ When carrying out repairs on engines with leaking
valves, it is not sufficient to machine or replace the
valve seats and valves. It is also necessary to inspect
the valve guides for wear, particularly on engines with
a high mileage.
♦ Rework valve seats only sufficiently in order to obtain
a proper contact pattern. Calculate the maximum per-
missible reworking dimension before commencing. If
the reworking dimension is exceeded, proper opera-
tion of the valve gear is no longer assured and the cyl-
inder head must be replaced.
Calculating maximum permissible reworking di-
mension
–
Insert valve and press firmly against the valve seat.
Note
If the valve is replaced when carrying out repair work, use
a new valve for the measurement.
–
Measure distance -a- between the valve stem and the
seat surface for valve spring.
–
Calculate max. permissible reworking dimension from
the distance measured and the maximum dimension.
Maximum dimen-
sions
in mm
Inlet valve
Exhaust valve
Edition 09.03
S00.5305.04.20
Exhaust valve
1.4 ltr 1.0 ltr 1.4 ltr
34,0 27,0 30,0
7,0 7,0 7,0
101,0 104,0 101,0
45 45 45
1.0 ltr. en- 1.4 ltr. en-
gine gine
43,1 42,7
43,0 42,8
Repairing cylinder head
15
S15-0093
15-2 3
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