Inlet Valve Cones
Repair / Checking
A5.05. 01.08.01.01
M20
en / 31.05.2010 IB022652 3/5
01
2. Cleaning
Clean the valve cone, e.g. blasting with
glass beads. Cleaning with sharp-edged
tools as well as pickling with inorganic
acids (hydrochloric acid, sulphuric acid,
hydrofluoric acid etc.) is not allowed.
3. Repair (refinishing of the valve cone
face)
3.1 Regrind valve cone faces in accordance
with prescribed angle (Fig. 3). Do not
refinish existing concave fillet.
3.2 The appropriate information of the grinding
machine manufacturers is to be observed
during grinding.
3.3 Determine the dimension between visible
edge of the base metal plating “X” and the
outer edge of the seat after completing the
grinding process. Replace the valve cone
if the actual dimension falls below the
minimum dimension.
3.4 Outer edge rounded with stone.
NOTE
Refinishing should always be
carried out professionally on
precision spindle grinding ma-
chines. If no such machine is
available, the valves should be
given to a MaK workshop for
regrinding.
CAUTION
When the valve cone is refinished, the valve seat ring must also be refinished
(01.08.02.nn).
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