Repair Instructions of Volvo Penta Engine
by Starlight Generator dieselgeneratortechRepair
Instructions of Volvo Penta Engine/Volvo Power Generator
General advice on working with
EMS engines
The following advice must be
followed to avoid damage to the engine control unit and other electronics.
IMPORTANT!
The system must be disconnected
from system voltage (by cutting the current with the main switch) and the
starter key(s) must be in the 0 position when the engine control unit
connectors are disconnected or connected.
• Never
disconnect the current with the main switches when an engine is running.
• Never undo
a battery cable when the engine is running.
• Turn the
main switches off or disconnect the battery cables during quick charging of the
batteries.
NOTICE! During normal trickle
charging, it is not necessary to turn the main switches off.
• Only
batteries may be used for start help. A help start device can produce a very
high voltage and damage the control unit and other electronics.
• If a
connector is disconnected from a sensor, be very careful to avoid allowing the
contact pins to come into contact with oil, water or dirt.
Electrical
Welding
1 NOTICE! Cut the current with
the main switch.
IMPORTANT!
The system must be disconnected
from system voltage when the engine control unit connectors are disconnected or
connected.
2 Undo the two connectors from the
engine control unit before any electrical welding starts. Turn the locking arm
down at the same time as the connector is pulled outwards.
3 Disconnect all connections to
the alternator. Connect the welder earth clamp to the component to be welded,
or as close as possible to the weld site. The clamp must never be connected to
the engine or in such a way that current can pass through a bearing.
IMPORTANT!
After welding is completed, the
disconnected components, such as alternator cables and battery cables must be
connected in the correct order. The battery cables must always be connected
last.
Changing the engine control unit
1 NOTICE! Cut the current with
the main switch.
IMPORTANT!
The system must be disconnected
from system voltage when the engine control module connectors are disconnected
or connected*.
2 Remove the two connectors from
the engine control unit. Turn the locking arm down at the same time as the
connector is pulled outwards
3 If the new engine control unit
has recently been programmed.
Start the engine and check
whether any fault codes related to the engine control unit occur.
Checking the starter motor
voltage
Tools:
88890074 Multimeter
General
If battery voltage falls below
24.7 V*, the starter motor will not be able to crank the engine at normal
speed. A fully charged battery has an open circuit voltage of about 12.7 V.
NOTICE! * Measured on the
batteries. Voltage measurement, check
1 Check that the battery voltage
is at least 24.7 V when unloaded by using 88890074 Multimeter to measure
between the battery poles.
2 Turn the main switch on.
3 Check that the voltage between
terminal B+ on the starter motor and battery negatives connection point is the
same as the battery voltage.
Checking the
charging system
Generally about alternators:
The voltage output from an
alternator must be limited to prevent the elecrolyte in the battery to
evaporate. The alternator output is regulated (limited) by the voltage
regulator in the alternator. The maximum current that the alternator can
deliver at regulated voltage output depends on the alternator revolution. When
the engine is started an excitation current is needed to “wake up” the alternator.
NOTICE! It is the consumers
(batteries included) which decides the output current from the alternator.
Measurements
1 Engine off.
2 Use 8890074 Multimeter to do a
voltage measurement over the battery. The nominal voltage over a full loaded
battery is approx. 12.7 V.
3 Engine on. Run at 1500 rpm.
4 Use 88890074 Multimeter to do a
voltage measurement over the battery and also over the alternator.
The nominal charging voltage over
the batteries should be approx. 27.8-28.6 V.
Tools:
88890074 Multimeter
Fault
tracing charging system
Battery check
1 Check that all connectors at
the battery are correctly assembled.
2 Check the condition of the
cables to the battery.
3 Check the water level in the
battery.
4 Check, if possible, the
specific gravity of all cells. when no charge
1 Check the alternator belt
tension.
2 Check that all connectors at
the alternator and at the battery are correctly assembled.
3 Check the condition of all
cables in the charging system.
4 Regulator fault. Replace
regulator. when undercharge
1 Check the alternator belt
tension.
2 Check that all connectors at
the alternator and at the battery are correctly assembled.
3 Check the condition of all
cables in the charging system.
4 Regulator fault. Replace
regulator. when overcharge
1 Probably
regulator fault. Replace regulator.
Rail
pressure measurement
This measurement is used for
measuring the rail pressure. For example if the engine doesn´t start this
measurement can show the rail pressure while the engine is cranking. If it is
air in the system the rail pressure could be too low for the engine control
unit to activate injection.
1 NOTICE! Starter key in position
0.
2 Undo the connector from the
sensor.
3 Connect adapter cable (885675)
between the sensor and the EECU.
4 Use multimeter (88890074) for
voltage measurement. Connect the COM from the multimeter to measurement point
1. Connect V from the multimeter to measurement point 2.
5 NOTICE! Starter key in position
I. The multimeter should now show 0.5 Volt which is equal to 0 Mpa (0bar).
6 When cranking the engine, read
the voltage value on the multimeter and look in the table which pressure the
voltage equals.
NOTICE! To activate injection a
rail pressure of at least 25 MPa (250 bar) is demanded.
Manual fault
tracing in bus cables
Tools:
88890074 Multimeter
IMPORTANT!
Cut the current with the main
switch before the cables are disconnected.
Use the multimeter to check the
bus cables. The conductors in the bus cables should not be in contact with each
other. Disconnect a bus cable at each end and measure the resistance between
the pins to check this. The multimeter should show infinite resistance between
each pin. If the resistance is less than infinite, there is a fault.
Measuring
the engine cables
Two types of measurements are
done on the engine cable harness, both resistance measurement and oltage
measurement.
The measurements are done to
ensure that no open circuits or short circuits occur. If
there is an open circuit, the resistance is infinite, and if there is a short circuit, it is close to zero. The resistance values given in the workshop manual are approximate, and should be regarded as guidelines.
NOTICE! When resistance
measurement is done, the engine should be stopped and system voltage should be
cut off with the main switch. All resistance measurement is done at +20 °C (68
°F) and with a cold engine.
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Created on Jul 5th 2018 20:50. Viewed 422 times.