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

Tests and Adjustments

TESTS AND ADJUSTMENTS

Measuring Charge Pressure

The turbocharger charge pressure can be
measured using 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 )
Figure 9-1
1. Remove charge air temperature sensor
(Figure 9-1, (1)) from charge air intake pipe.
2. Install an M12x1.5 adapter and connect a
mechanical gauge to the charge air
temperature sensor port.
3. Operate the engine under normal load
conditions at WOT (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 (4BY) or replace the turbocharger. See
Adjusting Charge Pressure - 4BY on page 9-8.
BY Service Manual
Specifications
Inspection Item
Turbocharger
Boost Pressure
0003769B
TURBOCHARGER
Engine Limit
Minimum Maximum
4BY150 1600 mbar 1750 mbar
(23.2 psi) (25.4 psi)
Minimum Maximum
4BY180 1650 mbar 1800 mbar
(23.9 psi) (26.1 psi)
Minimum Maximum
6BY220 1900 mbar 2020 mbar
(27.6 psi) (29.3 psi)
Minimum Maximum
6BY260 2000 mbar 2120 mbar
(29.0 psi) (30.7 psi)
9-7