Yanmar 6BY2 - Tests and Adjustments; Measure Charge Pressure

TURBOCHARGER
Tests and Adjustments
12/05
BY Service Manual
9-5
© 2009 Yanmar Marine International
TESTS AND ADJUSTMENTS
Measure Charge Pressure
The turbocharger charge pressure can be
measured using a console digital display.
Low charge pressure can be due to compressor
wheel or turbine wheel damage, control rod wear or
dirt in the compressor housing.
1. Remove charge air temperature sensor
(Figure 9-1, (1)) from charge air intake pipe.
Figure 9-1
Figure 9-1
2. Install an M12 x 1.5 adapter and connect a
mechanical gauge to the charge air
temperature sensor port.
3. Operate the engine under normal load
conditions at wide open throttle (4000 rpm) and
take a reading after at least 30 seconds of
constant operation.
Results:
If the reading is not within specification, adjust the
control rod (4BY2) or replace the turbocharger.
Specifications
(
1
)
0003769B
Limit
Inspection Item Engine Minimum Maximum
Turbocharger
Boost Pressure
4BY2-150
1600 mbar
(23.2 psi)
1750 mbar
(25.4 psi)
4BY2-180
1650 mbar
(23.9 psi)
1800 mbar
(26.1 psi)
6BY2-220
1950 mbar
(28.3 psi)
2150 mbar
(31.2 psi)
6BY2-260
2000 mbar
(29.0 psi)
2200 mbar
(31.9 psi)