BASIC TROUBLESHOOTING
HARD STARTING
Engine Will Not Rotate
Probable Causes:
Low Cranking Speed
Engine Cranks But Will Not
Start
Low battery voltage
X
X
Loose cranking motor
connections
X
Faulty cranking motor
X
X
Faulty cranking motor switch
X
X
X
Internal seizure
X
Improper lube oil
X
Circuit breaker/electronic control
malfunction
X
Fuse blown or missing
X
Insufficient Fuel Supply
Air in fuel
X
Out of fuel
X
Loose fuel connections
X
Cracked fuel lines
X
Obstructed fuel filters/lines
X
Faulty fuel pump
X
Faulty injector operation
X
Restricted fuel-fitting missing
X
DDEC malfunction
X
Low Compression
Worn intake and exhaust valves
X
Worn piston rings/liners
X
Leaking cylinder head gasket
X
Improper intake and exhaust
valve adjustments
X
61
60
In addition to the cleaning procedure,
other components of the cooling sys-
tem should be checked periodically
to keep the engine operating at peak
efficiency.
I. When to Service the
Dry Type Air Cleaner
Replace dry type air cleaner elements
when the
maximum allowable air
cleaner restriction
(20 inches of water
or 5.0 kPa) has been reached, or
annually, whichever comes first. Some
air cleaners are equipped with a
restriction indicator which aids in
determining the service interval.
Cleaning and/or reusing dry paper
type air cleaner elements is not recom-
mended unless the cleaning method
used removes clogging without dam-
age to the element. Inspection and
cleaning of elements must be done in
accordance with the air cleaner manu-
facturers’ recommendations, if any.
NOTICE:
If all of the coolant is drawn out of
the recovery bottle when the engine
cools, remove the pressure control
cap from the radiator or heat
exchanger and check to make sure
the coolant level is at or near the
bottom of the filler neck. Add
coolant as required to bring it to this
level. Replace the pressure control
cap and fill the recovery bottle to
the "Full Cold" mark, or no more
than one-quarter full. Do not overfill
the recovery bottle since this can
result in spillage as the coolant
heats and expands during engine
operation. Failure to properly fill the
cooling system and purge it of air
can result in engine overheating
and serious engine damage.
NOTICE:
If the engine overheats and the
coolant level is satisfactory, the
cooling system may require clean-
ing with a descaling solvent and
backflushing. Authorized Detroit
Diesel service outlets are properly
equipped to perform these services.
Summary of Contents for 92 Series
Page 41: ...NOTES 77 NOTES 76 ...
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