The ship diesel engine is difficult to start

When the starting difficulty is found, there are the following conditions:

After starting, crankshaft foundation can not move may rotate slowly, that is, the starting speed is too low.

The starting speed is normal, but the ship diesel engine is not on fire.

When starting, the ship diesel engine although the fire, but the ship diesel engine operation is not normal, the speed is not stable, and even saved.

Factor analysis

(1) starting system: leakage of the trachea or trachea is too long, lack of air source pressure, air compressor damage, etc.

The fuel system: low oil pressure parking lever is not under the board, fuel tank valve is not opened, fuel tank no oil, fuel tank orientation is too low, there is air in the fuel pipeline, diesel filter is too dirty, overspeed parking device is not reset, rack stuck in the refueling direction, injector is not atomized, injection pump is not pump oil or injector is not spray oil.

3, the intake and exhaust system: air filter fouling plug, cooler fouling plug, explosion-proof door valve is not opened, timing of gas distribution is wrong, exhaust system fouling plug.

(4) incineration system: the lack of compression pressure, piston and cylinder head clearance is too big, too small, cylinder head out of the cylinder head plane is too big, too small.

External conditions: start with load, the oil temperature is too low, viscosity is too big; The water temperature is too low, ice in the pump; Diesel oil is too cold and viscous.

6 internal conditions: valve touch piston or cylinder in the presence of foreign bodies; Burn tile, hold shaft, pull cylinder.

Lack of Marine diesel power

The so-called power shortage is generally referred to as the ship diesel engine "powerless", "no strength". Under normal conditions, the power of the Marine diesel engine usually has a certain amount of reserves, can be the unit of the normal operation of machinery. When power is lacking, it is shown as the ship diesel engine can't move the working machinery with it, and the following scene is accompanied:

Black smoke from exhaust pipe of ship diesel engine.

The ship diesel engine exhaust temperature is high. At the moment the exhaust pipe and turbocharger of the turbine is dark red.

The speed of Marine diesel engine may be slow speed instability, and the sound of weak operation.

Factor analysis

(1) lack of oil supply: oil filter fouling plugging; The fuel line is too thin and too long to leak; The fuel system has air; The fuel quality is not good, the oil contains water; Injection pump may adjust the limit of lead seal is damaged oil; Governor pull rod screw screw into too much, tooth rod extension length is not good; Injection pump plunger wear severe single cylinder oil supply is too small.

2, poor atomization or combustion chamber does not match: oil head atomization is poor; Wrong oil supply advance Angle; The oil head sticking out of the cylinder head is not in the right plane; Cylinder head piston carbon serious; Too large tightening clearance; The oil outlet valve is not tightly sealed.

3, the lack of air intake: air filter dirty; Dirty cooler; Compressor impeller dirty; Cylinder head inlet is dirty; Air leakage in the intake and exhaust pipe; Gas distribution punctual prohibition; Supercharger malfunction, low inlet pressure.

(4) of the vent is not smooth: the exhaust pipe is too curved too long, or turn more; Exhaust muffler dirty; Cylinder cover exhaust duct dirty; It's not right to exhaust on time.

5 external factors: the inlet temperature of the cooler is too high; High ambient temperature and humidity; Sea elevation and low air pressure; Overheating of Marine diesel engines; Abnormal wear and tear, Marine diesel engine cylinder, burning tile, axle, etc.