63
Starter motor
The starter motor is mounted on the flywheel casing
on the right of the engine.
When the starter motor is engaged, a drive on the
starter motor’s rotor shaft is moved in an axial direc-
tion so that it engages with a spur ring on the en-
gine’s flywheel. The drive’s axial movement and the
engagement of the starter motor are controlled by a
control solenoid on the starter motor.
The starter motor’s control solenoid is engaged in
turn via the starter relay* when the key switch is held
in position III.
*Pos. 5 in the engine wiring diagram on pages 71, 79 and 81,
pos. 6 on page 73 and pos. 8 in the diagram on pages 75
and 77.
Connecting the sensor system
Turn the engine off and turn off the power at
the main switches before carrying out work
on the electrical system.
1. Release the yellow sensor cable from the B+
connection on the generator.
2. Splice the cable (yellow 1.5 mm
2
) and route it to
the batteries. Connect the cable to the batteries’
positive (+) pole.
Charging control lamp (extra generator)
A separate charging control lamp (3W) can be con-
nected to the extra 28V/100A generator.
A resistor (3) P/N 863400-8 (47Ω/25W), must also be
connected as shown in a separate wiring diagram on
page 69.
Generator for alternating current
The generator is belt driven and located at the front
of the engine.
The engine’s standard generator can be fitted with a
charge distributor as an accessory. Two independent
battery circuits can then be charged simultaneously.
The charge distributor separates the two groups from
one another so that the engine’s storage batteries
are kept fully charged even if the “accessory batter-
ies” are weak or almost discharged.
The charging voltage from the 28V/60A generator is
thermally compensated. The voltage increases at low
temperatures and is reduced at higher temperatures.
Voltage regulator with sensor system
The voltage regulator for the standard generator
(14V/60A, or 28V/40A* or 28V/60A) has a sensor
system.
This sensor system compares the charging voltage
between the generator’s B+ and B– connections with
the charging voltage between the batteries’ positive
and negative poles. The voltage regulator then com-
pensates any drop in voltage in the leads between
the generator and the batteries by increasing the
charging voltage from the generator, if necessary.
When supplied by Volvo Penta, the sensor system is
not activated. However, it is likely that it was con-
nected when the engine was installed.
*Note: The 28V/40A generator is for the TAMD63 engine.
Stop solenoid*
The stop solenoid is located on the left of the engine
behind the injection pump (TAMD72WJ), or on the
exhaust manifold diagonally above the injection
pump (TAMD71). This solenoid is engaged via the
stop relay (pos. 8 in the engine wiring diagram) when
the starter key is held in the stop position (“S”).
See the wiring diagrams on pages 72–73.
When the solenoid is activated, the injection pump’s
control rod is moved into the zero delivery position
and the engine stops as the flow of fuel is cut off.
*Note. Up to engine No. 207181083/xxxx.
Solenoid valve
TAMD63 and late prod. TAMD71B* and
TAMD72WJ* engines have no stop solenoid. In-
stead, the engine is stopped via a solenoid valve
(fuel shut-off valve) which is activated during stop-
ping. The valve changes the direction of the fuel flow
to and from the feed pump so that a vacuum is
created in the fuel chamber of the injection pump.
This makes it impossible for the pump element to fill
up and the engine stops.
This valve is located on a bracket beneath the
injection pump.
*Note. As of and including engine No. 207181084/xxxx.
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