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en / 15.03.2001
IB023062
3/5
01
1.1
The valve seat rings are reusable without refinishing when
•
the circumference of valve face is metallic bright
•
no carbon deposits with blow holes or visible wear are present
•
by inspecting cracks using an illuminated magnifying glass (8-fold magnification) or
powder spraying procedure (Met L'Check) and/or in the flux procedure no crack
formation is established at the valve face.
1.2
The valve seat rings are not reusable when
•
cracks are present in the seat face
•
burn holes are present
•
the refinishing limits have been exceeded.
2.
Cleaning
Remove the residues from the seat faces.
3.
Maintenance (refinishing the valve seat rings)
Note:
Refinishing is to be carried out with the
MaK precision seat grinding machine
(W1) in a
workmanlike manner. Refer to special operating instructions.
Alternatively the seats may be refinished by means of the
MaK valve seat milling device
(
Fig. 6
/W2). Unnecessary stock removal is to be avoided, only carbon pockets are to be
repaired if they are present in the contact area.
3.1
Remilling of the valve seat
3.1.1
Clean the valve seat ring thoroughly in the contact area (3) of the centering washer (4) in
order to ensure an absolutely centrical fixing of the guide mandrel (5). Remove O-ring from
guide bush.
3.1.2
Insert centering washer (4) with guide mandrel (5) and tighten with tension nut (6).
Attention:
Handle the cutter head (2) with care, cutters are sensitive to impact, hard touch-down can
also damage the valve seat face.
Содержание M20
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Страница 30: ...Initial operation Engine A3 05 00 en 14 02 2001 BA000022 1 1 Initial operation...
Страница 44: ...Operational supervision Engine A3 06 00 en 15 02 2001 BA000058 1 1 Operational supervision...
Страница 64: ...Removal from operation Engine A3 07 00 en 16 02 2001 BA000094 1 1 Removal from operation...
Страница 71: ...Danger of frost Engine A3 08 00 en 16 02 2001 BA000106 1 1 Danger of frost...
Страница 83: ...Running in Engine A3 10 00 en 16 02 2001 BA000242 1 1 Running in...
Страница 85: ...Fault tracing Engine A3 11 00 en 19 02 2001 BA000130 1 1 Fault tracing...
Страница 91: ...Emergency operation Engine A3 12 00 en 19 02 2001 BA000142 1 1 Emergency operation...
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Страница 106: ...Regulations and care Engine A4 05 00 en 21 02 2001 BA000158 1 1 Regulations and care...
Страница 137: ...Maintenance A5 en 31 10 2001 AA000026 1 1 Maintenance...
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Страница 243: ...Bearing Shells Inspection Evaluate A5 05 02 03 07 01 M20 en 13 06 1997 IB001449 4 4 02 4 5 6...
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