MAK M 20 - Page 95

Valve Seat Ring
Repair / Checking
A5.05. 01.08.02.01
M20
en / 30.09.2010 IB023062 1/5
01
See also: 01.07.01.nn, 01.08.01.nn
Spare parts list: B1.05.01.2.2107
Time requirement: 0 Pers./ 0,00 h
Personnel qualification: Chief engineer / skilled engine hand
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Operating medium: Heavy fuel and distillate fuel
Tools:
Valve refacer W1 * 2.9224 A
Valve seat milling machine W2 2.9224 C
* not available as figure
Auxiliary material:
Magnifying glass with light (8-fold magnification)
Diamond paste Dp 30/10 - 15 µm **
Thinner DIAPLASTOL **
** or a product of equal standard
NOTE
In case irregular contact reflections or pittings are indicated on the sealing faces of
the valve seat/valve face, both sealing faces are to be refinished in any case.
New or refinished valve seats are to be ground in accordance with operating se-
quence 4.
Refinishing of the seats may be necessary in the following cases:
• after extended operating times
• in the case of negative result, e.g. damaged valve faces, deep scars, uneven contact
reflections of the valve seat/face (Fig. 1 and 2)