64
c.
Blue smoke
Possible causes
Fixing methods
The 3
rd
ring is fitted upside down
Wearing of piston rings and valve
guides
Too much high the lube oil level
Refit it, with the ring face marked “
上
(up)”
upward
Replace them with new ones
Make it down by draining
5.1.4 Insufficient power developing
Generally, the insufficient supply of oil, air leakage and abnormal combustion will
result in such trouble.
Possible causes
Fixing methods
Blockage of diesel filter
Poor atomization of nozzle
Wearing of plunger and barrel
of injection pump
Deformation of governor
spring, resulting in low
rotating speed
Incorrect advance angle of
fuel
Blockage of air filter
Air leakage of intake and
exhaust valves
Incorrect valve timing
Insufficient compression
pressure
Clean it and replace filter element if necessary
Grind or replace it
Replace with a new one
Adjust it or replace with a new spring
Adjust
Clean it or replace it if necessary
Check
valve
clearance
and
sealing
effectiveness
Check and adjust, or replace cam shaft if
necessary
Replace cylinder liner or piston rings
5.1.5
Abnormal sound
Possible causes
Fixing methods
Too much big the advance
angle of fuel
Needle valve of injector
seized
Valve clearance is too big,
rhythmic valve hammering
can be heard clearly
Piston touches valves
Piston knocks the bottom of
cylinder head
Valve spring is broken
Adjust it
Loosen the high-pressure oil pipe in turn to
detect the seized needle valve according to
injecting sound (if any one is seized, then it will
not give out injection sound), replace the seized
one with a new one
Adjust it
Valve sinkage is not enough, reamer the valve
seat again
Replace the cylinder head gasket with a thicker
one
Replace the broken one with a new one
