66
axial clearance of crank shaft
7. Mussy sound or light rhythmic
slap at the cylinder cover can be
heard as a result of broken valve
spring, bent pushing bar or too
much clearance of valve.
8. Piston collides with cylinder
cover
9.Collision can be heard at gear
compartment when decreasing
rotation speed suddenly, as a
result of too much clearance
caused by gear abrasion
Check piston and valve for
collision and furthermore, check
if marks of piston and gas
distribution gear are right.
Replace gear according to actual
condition.
1.5 Too high
temperature of the
engine oil
1. Overload of engine.
2. Too low or too high engine oil
3. Serious air leakage
4. Oil cooler blocked inside,
pressure of bypass valve
incorrect, crust blocked by dirt.
Decrease load.
Increase or decrease engine oil
level as specified.
Check piston ring and cylinder
sleeve,
Check, clean and adjust by-pass
valve.
1.6
Abnormal fume
drained from the
engine
Note:
Fume of diesel
engine under normal
load is light grey, and
only changed to be
deep grey even under
temporary great load.
When the fume
drained from the diesel
engine is blue, white
or black, it is regarded
as abnormal. Blue
fume indicates burning
of engine oil, white
fume indicates
existence of water or
failure of fine droplets
of diesel to burn, black
fume indicates too
1.Emitting Blue fume
a. Too much engine oil, piston
ring installed in conversed
direction, clipped or worn.
b. Oil sealing of valve rod
damaged.
2. Emitting white fume
a. Bad spraying of oil injector,
leakage or dripping.
b. With water in the cylinder.
3. Emitting black fume
a. Engine running with overload.
b. Too much oil injection.
c. Too late oil supply, too much
afterburning.
d. Incorrect valve clearance,
adherence of valve, blow-by
caused by bad coordination of
valve and seat.
e. Blockage of air filter element.
Check and repair.
Replace the oil seal.
Adjust the pressure of oil
injection; check the sealing
condition of parts.
Adjust to the specified load.
Adjust the oil supply.
Adjust the angle of advance of
oil supply.
Check valve clearance, valve
spring, and the sealing condition
of conical surface and repair.
Check and repair.
Summary of Contents for PY180H
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Page 39: ...35 A3 润滑图 ...
