MAK M20, Operating Instructions Manual

Page: 213 / 456

Inlet Valve Cones
Repair / Checking
A5.05. 01.08.01.04
M20
en / 30.07.2001 IB023324 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