63
Spring of the pressure regulator
valve of oil filter is out of shape
or broken
Wear and tear of oil pump
Too much the clearance of
bearing fittings
Replace it
Replace it or reduce its paper gasket
Check and replace them if necessary
b.
Overpressure of lube oil
Possible causes
Fixing methods
Pressure regulator valve of filter is
out of order
Oil becomes too thick at low
temperature
Check and adjust it
Replace it with the lube oil of designated
category
c. No lube oil on the rocker shaft
Possible causes
Fixing methods
Too low the oil pressure
Blockage being somewhere in
lubricating system
Make adjustment
Find out and fix it
5.1.3
Smoking of the exhaust
Normally, poor atomization and combustion causes black smoke. If diesel drops
are unable to burn or some water comes into cylinder, then the white smoke will
be resulted. Burning of lube oil scurrying above the piston will produce blue
smoke.
a.
Black Smoke
Possible causes
Fixing methods
Sluggishness of nozzle valve
Overloading
Wrong advance angle of fuel
Poor sealing of valves or incorrect
valve timing
Too much unevenness of the diesel
distribution among cylinders
Blockage of air filter
Wearing of cylinder liner and piston
rings
Replace or grind it
Adjust the load
Adjust it
Check and adjust it
Check fuel injection of every cylinder
on injection pump test bed and make
adjustment
Blow or brush it clean
Replace them with new ones
b.
White smoke
Possible causes
Fixing methods
Too low the injection pressure
results poor in atomization with oil
drops
Too low the temperature of cooling
water
Water being in cylinders
Check, adjust or replace the injection
pump
Cover the radiator with a cotton pad
Check cylinder head gasket and cylinder
head, replace the damaged parts with
new ones
