BELARUS-1021/1021.3
Operating manual
49
4.2.3 Engine start aid for low
temperatures (+4° and below)
Start preheater
Start preheater is installed on BELARUS-
1021 tractors.
Warning:
Never use ether starting aids if a
start preheater is installed. Use of ether may
result in an explosion in the intake manifold
and to serious traumas or injuries to the
operator. When installing ether starting aids,
disconnect and isolate the start preheater
wires located at the engine intake manifold.
The start preheater is efficient in the range
of ambient temperatures from +4°C to minus
20°C. It consists of the tank (1) with diesel
fuel and the heating element (2) consisting of
a spark plug, a solenoid-operated valve and a
nozzle.
When the SPH is switched on, the glowing
plug ignites the fuel in the intake manifold
and heats up the intake air going to the
cylinders.
Spark plugs
On BELARUS-1021.3 tractor, spark plugs
installed in the cylinder head are used as a
starting aid. For SP control, a spark plug
control unit and a spark plug switch are
introduced to the electric circuit. The operator
selects the operating mode of the spark plug
unit according to the engine or environment
temperatures.
The following operating and diagnostic
modes of the spark plugs are possible:
1. Starting the engine without switching on
the spark plugs (this mode is described in 4.2.2
above).
2. Starting the engine with switching on
the spark plugs (this mode is described in
4.2.4 below).
3. Emergency modes.
The emergency modes are tracked by the
spark plug unit, information is presented by
periodic, with various frequency, flashing of
the SP pilot lamp. The spark plug unit
diagnoses the following emergency modes:
- if the spark plugs do not go off after
completion of the full cycle of work as
specified in 4.2.4 (possible sticking of the
relay switch contacts or a mechanical failure),
the pilot lamp goes on flashing with the
frequency of 2 Hz until the terminal voltage is
removed;
- if during operation of the spark plugs in
the mode of starting the engine with the spark
plugs on, the voltage is not supplied to the
SPs, the pilot lamp goes on flashing with the
frequency of one flash per 3 seconds;
- when the supply voltage of the spark plug
unit exceeds 16V, the electronic module is
switched off.
