Tests And Adjustments; Measure Charge Pressure - Yanmar BY Series Service Manual

Tests and Adjustments

12/05

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
( 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.
BY Service Manual
Specifications
Inspection Item
Turbocharger
Boost Pressure
0003769B
© 2009 Yanmar Marine International
TURBOCHARGER
Limit
Engine Minimum
1600 mbar
4BY2-150
(23.2 psi)
1650 mbar
4BY2-180
(23.9 psi)
1950 mbar
6BY2-220
(28.3 psi)
2000 mbar
6BY2-260
(29.0 psi)
Maximum
1750 mbar
(25.4 psi)
1800 mbar
(26.1 psi)
2150 mbar
(31.2 psi)
2200 mbar
(31.9 psi)
9-5