Valve Seat Ring
Repair / Checking
A5.05. 01.08.02.00
M20
en / 16.09.1997 IB001438 5/5
01
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3.1.7 If the milling cutters are blunt, the cutter head is to be sent to MaK for refinishing.
3.1.8 Dismount the milling device. Grind sharp edges with the fine emery cloth.
4. Check of contact reflection/grinding
4.1 Apply small dots of the diamond paste Dp 30/10 - 15 µm with a syringe to the valve seat of
the new or refinished vlave spindle and distribute the paste uniformly. Thereafter spray the
complete seat ring surface with thinner DIAPLASTOL (01.08.01.nn).
4.2 Insert the lubricated valve stem into the guide bush. Fasten the device (W1) (01.08.01.nn) to
the valve head and grind the valve face and seat by hand applying a moderate pressure,
rotating the device. The contact reflection “a” which is visible by the rough grinding
process shall be
30 - 50 % of the circumferential seat width “b”
starting from the outside diameter (01.08.01.nn).
4.3 If the contact reflection is poor, the valve must not be reground anymore, however, both
sealing faces are to be refinished.
4.4 Ensure that the components (valve face and seat ring) refaced to one another will be held
together.
5. Final check of valve condition
5.1 Check whether the refinishing limit dimensions have been observed.
5.2 Clean valve face/seat thoroughly and check the sealing faces with an illuminated
magnifying glass (8-fold magnification) for cracks in the armouring and in the adjacent
zone.
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