
46 RENR5622
Troubleshooting Section
3. Check the fuel tank for foreign objects which may
block the fuel s
upply.
NOTICE
Do not crank the engine continuously for more than
30 seconds. All
ow the starting motor to cool for two
minutes before cranking the engine again.
4. Prime the fuel
supply system if any of the following
procedures have been performed:
•
Replacement o
f the fuel filters
•
Service on the low pressure fuel supply circuit
•
Replacement of unit injectors
Note: A sight g
lass in the supply line is helpful in
diagnosing air in the fuel. Refer to the Systems
Operation/Testing and Adjusting manual for more
information
.
5. Cold weather adversely affects the characteristics
of the fuel. R
efer to the Operation and
Maintenance Manual for information on improving
the characteristics of the fuel during cold weather
operation.
6. Check the fuel pressure during engine cranking.
Check the fu
el pressure after the fuel filter. Refer
to the Systems Operation/Testing and Adjusting
manual for the correct pressure values. If the fuel
pressure is
low, replace the fuel filters. If the fuel
pressure is still low, check the following items: fuel
transfer pump, fuel transfer pump coupling, and
fuel press
ure regulating valve.
Combustion
Check for mechanical problems in the combustion
system.
i02304590
Engine Has Early Wear
SMCS Code: 1000-038; 1901-038
Probable Causes
•
Incorrect engine oil
•
Contaminated engine oil
•
Contaminated air
•
Contaminated fuel
•
Low oil pressure
Recommended Ac
tions
Incorrect Engine Oil
Use engine oil that is recommended and change the
engine oil at the interval that is recommended by the
engine’s Oper
ation and Maintenance Manual.
Contaminated Engine Oil
Drain the crankcase and refill the crankcase with
clean engine oil. Install new engine oil filters. Refer
to the engine’
s Operation and Maintenance Manual
for more information.
If the oil fil
ter bypass valve is open, the oil will not be
filtered. Check the oil filter bypass valve for a weak
spring or for a broken spring. If the spring is broken,
replace the s
pring. Refer to the engine’s Disassembly
and Assembly manual. Make sure that the oil bypass
valve is operating correctly.
Contaminated Air
Inspect the
air inlet system for leaks. Inspect all of
the gaskets and the connections. Repair any leaks.
Inspect the
air filter. Replace the air filter, if necessary.
Contaminated Fuel
Inspect the fuel filter. Replace the fuel filter, if
necessary.
Contaminants in the fuel such as hydrogen sulfide
and sulfur can lead to the formation of acids in the
crankcase
. Obtain a fuel analysis.
Low Oil Pressure
When some components of the engine show bearing
wear in a short time, the cause can be a restriction in
a passage f
or engine oil.
An indicator for the engine oil pressure may indicate
sufficien
t pressure, but a component is worn due to a
lack of lubrication. In such a case, look at the passage
for the engine oil supply to the component. Refer to
the Syste
ms Operation/Testing and Adjusting manual
for additional information.