Exhaust Valve Cones
Repair / Checking
A5.05. 01.08.01.03
M20
en / 12.10.2000 IB022666 1/5
01
Ĺ
See also: 01.07.01.nn, 01.08.02.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
Tools:
Valve refacer W1 2.9224-A
Auxiliary material:
Diamond paste Dp 30/10 - 15 µm *
Thinner F25 *
* or a product of equal standard
Note:
Grind new or refinished and/or used undamaged exhaust valve cones before the
installation in accordance with sequence of operations 4.
Refinishing of the valve cones (in accordance with sequence of operations 3) may be
necessary in the following cases:
• after extended operating periods,
• in the case of negative result, e.g. damaged sealing faces, deep scars, uneven contact
reflections of the valve cone/seat.
Sequence of operations:
1. Check of valve condition
1.1 Valves may be reused without refinishing when
•the circumference of the valve cone face is metallic bright
•the valve cone face does not indicate carbon pockets with blowholes,
•by inspecting cracks, using magnifying glass with light (8 fold magnification) or powder
spraying procedure (Met L'Check) and/or in the flux procedure, no crack formation is
discovered at the valve cone face.
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