Diesel Generator Weak Operation

Diesel generators run weakly and emit heavy smoke. This is mainly due to insufficient fuel injection atomization and incorrect refueling time.

• The fuel injection nozzle or the fuel delivery valve is  severely worn, dripping, poor atomization, and insufficient combustion.

• The installation position of the fuel injector on the cylinder head is not correct. The use of copper pads or aluminum washers that are too thick or too thin may cause improper injection of the fuel injector and insufficient combustion.

• The components of the fuel injection pump transmission system are worn out, causing the fuel supply to be too late.

• The fuel supply time has not been adjusted.

When the speed is unstable, the diesel engine emits smoke.

• The fuel supply of different cylinders is inconsistent. The abrasion or improper adjustment of the jet pump and fuel injection nozzle can easily cause uneven fuel supply in each cylinder. The method of judging the inconsistency of fuel supply can make the diesel generator run empty. Using the cylinder stop method, one cylinder is stopped for oil supply in turn, and the speed meter is used to measure the speed. When the cylinder is broken, the fuel supply of each cylinder is the same, and the change of the cut-off volume should be the same or very close. If there is a big difference in the speed change, the fuel supply of the fuel injection pump should be adjusted.

• Water vapor or air leakage in the oil circuit of the diesel fuel supply system can also cause poor fuel supply from the fuel injection pump.

Diesel generators have low speed and smoke, but the high speed is basically normal.

It’s that the cylinder leaks air, and the air leaks less at high speeds, so it can basically work normally. Gas leakage causes low temperature and is not easy to cause fire. During the operation of the diesel generator, if a large amount of smoke is emitted from the fuel filler port, or there is a "squeak" air leakage sound in the crankshaft operation part, and it is obvious at low speed, it can be judged as air leakage between the cylinder block and the piston. The other two possible leaks are the valve and cylinder head gasket.

The diesel generator power is not good, but there is no smoke at the exhaust port when idling and when the fuel supply is small, and it is easy to emit black smoke when the fuel supply is large.

• The air filter element is blocked, causing the diesel generator to enter poor water, but the power is not enough.

• The valve clearance is too large, resulting in insufficient valve opening and poor air intake.

• Too much carbon deposits in the exhaust pipe, and the exhaust port resistance is too large.