Yanmar BY Series Service Manual page 238

TROUBLESHOOTING
Torque Reduction Chart Based on Boost Pressures
Using the boost pressure on the display, it can be determined if the engine is in this mode and approximately
where in the map it is. The present relative boost pressure is displayed on the instrument display.
Note: Relative boost pressure = absolute boost pressure - 1000 mbar
Engine speed [rpm]
Torque
Engine
100% (normal operation)
90%
80%
70%
60%
50%
Engine
100% (normal operation)
90%
80%
70%
60%
50%
Engine
100% (normal operation)
90%
80%
70%
60%
50%
Engine
100% (normal operation)
90%
80%
70%
60%
50%
13-4
4000 rpm
Boost pressure abs
Torque [N·m]
(mbar)
265
240
215
185
160
135
315
285
250
220
190
160
390
350
315
275
235
195
450
405
360
315
270
225
© 2009 Yanmar Marine International
Engine Faults and Torque Limitations
Torque [N·m]
4BY2-150
1600 295
700 265
600 240
300 205
150 180
0 15
4BY2-180
1700 315
1050 285
900 250
600 220
300 190
100 160
6BY2-220
2000 450
1400 405
1100 360
800 315
500 270
250 225
6BY2-260
2000 450
1700 405
1400 360
1150 315
700 270
400 225
BY Service Manual
2000 rpm
Boost pressure abs
(mbar)
700
400
250
100
0
0
900
500
350
200
50
0
1100
700
500
350
150
0
1100
700
500
300
100
0