Jacobsen AR331, Safety, Operation & Maintenance Manual

Page: 186 / 230

en-86
9 PROBLEM SOLVING
9.1 ENGINE PROBLEM DIAGNOSTICS
The Engine is difficult to start
Cause Action
The fuel is thick and does
not flow.
Check the fuel tank and fuel filter.
Remove any contamination from the
fuel system.
Clean the fuel filter with kerosene.
Air or water mixed in fuel.
The fuel system is a pressure type.
Air in the system will cause a
problem. Bleed the Fuel System.
To get correct fuel injection pressure,
check carefully for loose fuel line
couplings and loose cap nut.
Loosen the joint bolt stop, fuel filter
and air vent screws of fuel injection
pump to remove all the air in the fuel
system.
The engine oil becomes
thick in cold weather and
engine cranks slowly.
Change the grade of oil according to
the average temperature.
The battery is
discharged and the
engine will not crank.
Charge the battery.
In the winter, always remove the
battery from the machine. Keep the
battery charged and store in a dry,
safe environment.
Loss of Power
Cause Action
No fuel. Check the fuel system.
Moving parts at more
than operating
temperature.
Check lubricating oil system.
Make sure that the lubricating oil filter
flow is not decreased.
A dirty filter element can cause loss of
lubrication. Change the filter element.
The air cleaner is dirty.
Clean the filter element every 100
hours of operation.
Injection pump wear.
Use the correct grade of fuel. Low
grade fuel will cause the fuel pump to
wear. Only use the specified Diesel
fuel.
The Engine stops
Cause Action
There is no Fuel.
Check the fuel tank and fill with fuel.
Check the fuel system for air leaks.
Bad nozzle. If necessary, replace the nozzle.
Moving parts at more
than operating
temperature. Not
enough lubrication.
Check amount of engine oil with oil
level gauge.
Check lubricating oil system.
The oil filter cartridge must be
replaced at every second oil change.
Dirty Smoke or carbon increase on the Exhaust
Cause Action
Wrong fuel.
Only use Diesel fuel specified in
specification section.
Bad nozzle. If necessary, replace the nozzle.
Engine must be stopped immediately
Cause Action
The colour of the
exhaust turns dark. Check the fuel system and the fuel
injection nozzle.
The bearings are at
more than operating
temperature.
Check the lubricating system.
The oil-temperature
light is illuminated.
Check the lubricating system.
Check the function of the relief valve
in the lubricating system.
Check the pressure switch.
Check the fuel filter base gasket.