Exhaust Valve Cones
Repair / Checking
A5.05. 01.08.01.02
M20
en / 12.10.2000 IB022659 2/5
01
Ĺ
•when the deviation from the straightness is not greater than the following values (Fig. 1).
Measuring range “s” = 200 mm
= support points for test device
•when the radial run-outs of the valve cones do not exceed the following values:
1.2 Valves cannot be reused when
•the valve cone face is damaged
(cracks,blowholes)
•the wear caused by corrosive material
is
> 2 %
of the valve head diameter
(comparison with new valve)
•concave burns “s” caused by high-
temperature corrosion at the lower
side of the valve head
> 1.5 mm (Fig. 2)
•the lower part of the valve head
indicates severe pitting (formation of
so-called “paving stones”)
•corrosion pits and mechanical
damage in the area of the valve stem,
stem transition and valve head
•refinishing limit dimension is
exceeded.
A B
0,02
0,04 AB
A B
s
0,02
0,006
AB
20 20
Fig. 1
Fig. 2
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