Engine Problem Diagnostics - Jacobsen JMP653F Manual

9 PROBLEM SOLVING
9.1

ENGINE PROBLEM DIAGNOSTICS

The Engine is difficult to start
Cause
The fuel is thick and does
not flow.
Air or water mixed in fuel
The Engine oil becomes
thick in cold weather and
engine cranks slowly.
The Battery is
discharged and the
engine will not crank
Loss of Power
Cause
No fuel.
Moving parts at more
than operating
temperature.
The air cleaner is dirty
Injection pump wear
en-110
Action
Check the fuel tank and fuel filter.
Remove any contamination from the
fuel system.
Clean the fuel filter with kerosene.
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.
Change the grade of oil according to
the average temperature.)
Charge the battery.
In The winter, always remove the
battery from the machine. Keep the
battery charged and store in a dry,
safe environment.
Action
Check the fuel system.
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.
Clean the filter element every 100
hours of operation.
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
Check the fuel tank and
There is no Fuel
Check the fuel system for air leaks.
Bad Nozzle If necessary, replace the nozzle.
Check amount of engine oil with oil
level gauge.
Moving parts at more
than operating
Check lubricating oil system.
temperature. Not
enough lubrication.
The oil filter cartridge must be
replaced at every second oil change.
Dirty Smoke or carbon increase on the Exhaust
Cause Action
Only use Diesel fuel specified in
Wrong fuel
specification section.
Bad Nozzle If necessary, replace the nozzle.
Engine must be stopped immediately
Cause Action
The colour of The Check the fuel system and the fuel
exhaust turns dark. injection nozzle.
The bearings are at
more than operating Check the lubricating system.
temperature.
Check the lubricating system
Check the function of the relief valve
The oil-temperature
in the lubricating system.
light is illuminated.
Check the pressure switch.
Check the fuel filter base gasket.
fill with fuel.