Atlas Copco QAC 1100 Sd - Engine Troubleshooting Guide; Starter and Starting Failures; Engine Performance Issues (Power, Smoke, Consumption)

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Engine troubleshooting
The following table shows a generaldescription of
the possible engine troubles and respective causes.
The starter motor switches on the engine
too slowly
– Too low battery capacity.
– Bad electrical connection.
– Starter motor failure.
– Wrong lube oil grade.
The engine does not start or is difficult to
start
– The starter motor switches on the engine too
slowly.
– Empty fuel container.
– Faulty fuel control solenoid.
– Squeezed fuel pipe.
– Faulty fuel pump.
– Dirty fuel filter element.
– Air in the fuel system.
– Faulty atomizers.
– Improperly used cold start system.
– Faulty cold start system.
– Obstructed fuel tank vent openings.
– Wrong fuel type or grade.
– Squeezed exhaust pipe.
Poor power
– Squeezed fuel pipe.
– Faulty fuel pump.
– Dirty fuel filter element.
– Squeezed air filter/purifier or induction system.
– Air in the fuel system.
– Faulty atomizers or wrong atomizer type.
– Obstructed fuel tank vent openings.
– Wrong fuel type or grade.
– Restricted movement of engine speed control.
– Squeezed exhaust pipe.
– Too high engine temperature.
– Too low engine temperature.
Engine fails
– Squeezed fuel pipe.
– Faulty fuel pump.
– Dirty fuel filter element.
– Air in the fuel system.
– Faulty atomizers or wrong atomizer type.
– Faulty cold start system.
– Too high engine temperature.
– Wrong valve clearances.
Too low lube oil pressure.
– Wrong lube oil grade.
– There is not enough lube oil in the collector.
– Damaged indicator.
– Dirty oil filter element.
High fuel consumption.
– Squeezed air filter/purifier or induction system.
– Faulty atomizers or wrong atomizer type.
– Faulty cold start system.
– Wrong fuel type or grade.
– Restricted movement of engine speed control.
– Squeezed exhaust pipe.
– Too low engine temperature.
– Wrong valve clearances.
Black smoke leaving the exhaust pipe.
– Squeezed air filter/purifier or induction system.
– Faulty atomizers or wrong atomizer type.
– Faulty cold start system.
– Wrong fuel type or grade.
– Squeezed exhaust pipe.
– Too low engine temperature.
– Wrong valve clearances.
– Engine overload.