1.
Diagnosis and treatment of engine with normal low speed and short time high
speed with too little smoke exhaust
The engine idle speed is
good, and the throttle speed can be increased rapidly. However, the continuous
boom throttle speed is not easy to rise, the driving is weak, or the medium
speed is not able to drive. This is caused by insufficient low pressure oil
supply.
Reason
a. Fuel filter or the oil-water separator is blocked.
b. Low pressure oil
circuit is not smooth.
c. Insufficient oil
supply in oil pump or the oil filter is blocked.
d. The inlet valve of
fuel tank cover is invalid.
All of the above
conditions can cause the fuel pressure of the low pressure oil chamber of the
fuel injection pump to be insufficient, and only the oil supply amount required
for the small load can be maintained. when It is necessary to use more oil
supply for large and medium load, it cannot be satisfied, resulting in a weak
driving.
Diagnosis
and treatment
a. Check whether the
intake valve of the tank cover is invalid, if it fails, a certain vacuum degree
will be formed in the tank, and the diesel oil cannot be sucked out. Most of
this phenomenon is caused by the loss of fuel tank cover and sealing with airtight
plastic cloth.
b. Check if there is any
concavity in the low pressure oil pipe and whether there is any blockage at the
inlet pipe joint filter.
c. If the fuel filter or
oil-water separator is not replaced for a long time, it should be replaced in time.
d. Check if the oil pump
is working properly. If the oil supply is insufficient, replace or repair the
oil pump in time.
2.
Diagnosis and repair of low engine speed but no high speed, too little smoke
exhaust
The low speed of the
engine is good, but the speed can not be increased at the time of acceleration,
and the driving is weak, which is caused by insufficient circulating oil
supply.
Reason
a. The fuel injection
pump is not adjusted properly, so that the fuel supply is reduced.
b. The governor spring
is reduced in elasticity due to fatigue. When the throttle is stepped to the
end, the oil adjustment lever can not move forward to the head, so that the
fuel supply of the fuel injection pump is reduced and the engine cannot reach
the rated speed.
c. The fuel pump plunger
and the sleeve, the injector needle valve and the needle valve body are
seriously worn, so that the diesel oil leakage increases when the oil is
pumped, and the oil supply amount is relatively reduced.
d. Improper adjustment
of the throttle control lever, or the accelerator pedal pin is too far, the
accelerator pedal cannot be placed in place, resulting in too little oil supply
at full load.
e. There is air in the
oil circuit
Diagnosis
and treatment
When the engine power is
insufficient, if the low speed is good and the smoke exhaust is normal, it
means that the engine burns well, that is, the diesel injection quality is
good, the fuel supply start time is normal, the cylinder sealing is good and the
intake air is sufficient.
a. In the case of normal
low-pressure oil circuit, first check whether the degree of looseness of the
accelerator pedal connecting pin and the length adjustment of the connecting
rod are properly adjusted. When the throttle is stepped to the end and the
governor arm is at the maximum position, the high speed limit screw should be
in contact with the limit block. Otherwise it should be adjusted.
b. Drain the air from
the oil circuit.
c. Debug the fuel
injection pump on the test bench to eliminate the fault.
Hope the above methods
can help you solve common problems about Cummins generator.
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