Inlet Valve Cones
Repair / Checking
A5.05. 01.08.01.04
M20
en / 05.10.2010 IB023324 3/5
01
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
machines. 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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