Perkins NJ Series Troubleshooting Manual page 49

SENR9982-01
3. If the engine has a throttle switch refer to
Troubleshooting, "Throttle Switch Circuit - Test".
4. If the fault has not been eliminated, proceed to
"Air Intake and Exhaust System".
Air Intake and Exhaust System
1. Check the air filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following defects:
• Blockages
•
Restrictions
• Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. Ensure that the repairs have eliminated the fault.
6. If the fault has not been eliminated, proceed to
"Fuel Supply".
Fuel Supply
1. Visually check the fuel tank for fuel. The fuel
gauge may be faulty.
2. Ensure that the fuel supply valve is in the full
OPEN position.
3. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
4. Visually inspect the fuel supply lines for
restrictions.
5. Check that the low pressure fuel lines are tight
and secured properly.
6. Remove the fuel filters. Inspect the fuel filters for
contamination. Install new fuel filters. Refer to the
Operation and Maintenance Manual, "Fuel System
Filter- Replace and Fuel System Primary Filter
(Water Separator) Element - Replace". Determine
the cause of the contamination.
7. Check the diesel fuel for contamination. Refer to
Systems Operation, Testing and Adjusting, "Fuel
Quality - Test".
8. Check for air in the low pressure fuel system. Refer
to Systems Operation, Testing and Adjusting, "Air
in Fuel - Test".
9. Ensure that the fuel system has been primed.
Refer to Testing and Adjusting, "Fuel System -
Prime".
10. Check the fuel pressure. Refer to Testing and
Adjusting, "Fuel System Pressure - Test".
Contact with high pressure fuel may cause fluid
penetration and burn hazards. High pressure fu-
el spray may cause a fire hazard. Failure to fol-
low these inspection, maintenance and service in-
structions may cause personal injury or death.
NOTICE
Contact with high pressure fuel may cause personal
injury or death. Wait 60 seconds after the engine has
stopped to allow fuel pressure to purge before any
service or repair is performed on the engine fuel lines.
11. If the high pressure fuel lines have a leak, the
high pressure fuel lines must be replaced. Refer to
Disassembly and Assembly, "Fuel injection lines -
Remove and Fuel injection lines - Install".
12. If the repairs do not eliminate the fault, proceed to
"Individual Malfunctioning Cylinders".
Individual Malfunctioning Cylinders
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions. If the isolation of a particular cylinder
results in a reduction of engine speed that is less
than normal, this may indicate that the cylinder is
operating below normal performance. Investigate
the cause of the fault on any cylinder that is
not operating. Investigate the cause of the fault
on any cylinder that is operating below normal
performance.
2. If all cylinders have been checked and no
faults were detected proceed to "Electronic Unit
Injectors".
49
Troubleshooting Section