Yanmar 4BY - Page 265

TROUBLESHOOTING
13-4
BY Service Manual
Engine Faults and Torque Limitations
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] 4000 rpm 2000 rpm
Torque Torque [N·m]
Boost pressure abs
(bar)
Torque [N·m]
Boost pressure abs
(bar)
Engine 4BY150
100% (normal operation) 265 1600 295 700
90% 240 700 265 400
80% 215 600 240 250
70% 185 300 205 100
60% 160 150 180 0
50% 135 0 150 0
Engine 4BY180
100% (normal operation) 315 1700 315 900
90% 285 1050 285 500
80% 250 900 250 350
70% 220 600 220 200
60% 190 300 190 50
50% 160 100 160 0
Engine 6BY220
100% (normal operation) 390 2000 450 1100
90% 350 1400 405 700
80% 315 1100 360 500
70% 275 800 315 350
60% 235 500 270 150
50% 195 250 225 0
Engine 6BY260
100% (normal operation) 450 2000 450 1100
90% 405 1700 405 700
80% 360 1400 360 500
70% 315 1150 315 300
60% 270 700 270 100
50% 225 400 225 0