Instruction Manual
2954 9020 00 17
6.4 Alternator trouble shooting
6.5 Engine trouble shooting
The table below gives an overview of the possible engine problems
and their possible causes.
6.5.1 The starter motor turns the engine
too slowly
– Battery capacity too low.
– Bad electrical connection.
– Fault in starter motor.
– Wrong grade of lubricating oil.
6.5.2 The engine does not start or is difficult
to start
– Starter motor turns engine too slowly.
– Fuel tank empty.
– Fault in fuel control solenoid.
– Restriction in a fuel pipe.
– Fault in fuel lift pump.
– Dirty fuel filter element.
– Air in fuel system.
– Fault in atomizers.
– Cold start system used incorrectly.
– Fault in cold start system.
– Restriction in fuel tank vent.
– Wrong type or grade of fuel used.
– Restriction in exhaust pipe.
6.5.3 Not enough power
– Restriction in a fuel pipe.
– Fault in fuel lift pump.
– Dirty fuel filter element.
– Restriction in air filter/cleaner or induction system.
– Air in fuel system.
– Fault in atomizers or atomizers of an incorrect type.
– Restriction in fuel tank vent.
– Wrong type or grade of fuel used.
– Restricted movement of engine speed control.
– Restriction in exhaust pipe.
– Engine temperature is too high.
– Engine temperature is too low.
Symptom Possible cause Corrective action
Alternator does not excite. Blown fuse. Replace fuse.
Insufficient residual voltage. Increase the speed by 15 %.
No residual voltage. For an instant apply on the + and – terminals of the
electronic regulator a 12 V battery voltage with a
30
Ω resistor in series respecting the polarities.
After being excited alterna-
tor does not excite.
Connections are interrupted. Check connection cables as per attached drawings.
Low voltage at no load. Voltage potentiometer out of setting. Reset voltage.
Intervention of protection. Check rpm.
Winding failure. Check windings.
High voltage at no load. Voltage potentiometer out of setting. Reset voltage.
Failed regulator. Substitute regulator.
Lower than rated voltage at
load.
Voltage potentiometer out of setting. Reset voltage potentiometer.
Intervention by protection. Current too high, power factor lower than 0.8; speed
lower than 10 % of rated speed.
Failed regulator. Substitute regulator.
Rotating bridge failure. Check diodes, disconnect cables.
Higher than rated voltage at
load.
Voltage potentiometer out of setting. Reset voltage potentiometer.
Loose sensing wires on AVR. Check sensing wires on AVR.
Failed regulator. Substitute regulator.
Unstable voltage. Speed variation in engine. Check regularity of rotation.
Regulator out of setting. Regulate stability of regulator by acting on “STA-
BILITY” potentiometer.
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