ABNORMAL OPERATING CONDITIONS
High Lubricating Oil Consumption
Probable Causes:
Low Oil Pressure
Loose connections
X
Cracked lines
X
Damaged gaskets or seal rings
X
* Lube oil loss at breather tube
X
* Lube oil loss at dipstick tube
X
[*Indicates high crankcase pressure]
Leaking oil cooler
X
Leaking valve stem seals
X
Worn/broken oil control rings
X
Scored liner and/or piston
X
Excessive engine installation angle
X
Crankcase overfilled
X
Oil in air tanks (air compressor
malfunction)
X
Plugged crankcase breather
X
Oil level low
X
Improper engine oil viscosity
(fuel in the oil)
X
Faulty oil pressure regulator valve
X
Worn crankshaft bearings
X
Worn camshaft or connecting rod
bearings
X
Missing cup plugs in rocker arm
shafts
X
Faulty oil pressure relief valve
X
Air leaks in oil pump (suction
side)
X
Worn or damaged oil pump
X
Faulty oil pressure gage
X
Faulty electrical components (for
gage)
X
Plugged oil orifice
X
Obstructed oil line
X
63
OBJECTIONABLE EXHAUST
Black or Gray Smoke
Probable Causes:
Blue Smoke
White Smoke
Damaged or dirty air cleaner
X
Improper grade of fuel
X
Excessive exhaust back pressure
X
Misfiring cylinders
X
Lubricating oil not burned in
cylinder (being burned in
exhaust manifold or turbocharger)
X
Faulty injector setting
X
Faulty oil control rings
X
Excessive installation angle
X
Excessive oil in crankcase
X
High ambient air temperature
X
Thin air (high altitude
X
Cetane rating of fuel too low
X
Air in the fuel system
X
ABNORMAL ENGINE OPERATION
Rough Running or Frequent Stalling
Probable Causes:
Low Power
Detonation
Misfiring cylinder
X
X
Insufficient fuel
X
X
High return fuel temperature
X
X
Low compression
X
X
DDEC malfunction
X
X
High air inlet restriction/exhaust
back pressure
X
Engine application
X
High air inlet temperature
X
High altitude operation
X
Incorrect engine gear train timing
X
Low coolant temperature
X
Oil picked up by inlet airstream
X
Faulty injector operation
X
Incorrect injector height setting
X
X
62
Summary of Contents for 92 Series
Page 41: ...NOTES 77 NOTES 76 ...
Page 42: ...NOTES 78 ...