Marine diesel engine is the power source of ships and the main component of ships. Because the composition and structure of Marine diesel engine are abnormal and disorderly, it is inevitable that some faults will appear in the working process. This is bad for the normal operation of ship diesel engine and ship. In order to ensure the normal operation of Marine diesel engine, it is very important to find out and eliminate these problems as soon as possible. Next, guangdong ship maintenance small make up from several aspects to analyze the ship diesel engine common faults, in order to help us very good understanding of ship diesel engine, ship safety and useful work.

Marine diesel engine can be classified from different aspects according to the fault condition. For example, according to the severity of the fault and the damage caused, it can be divided into four categories: nominal fault, severe fault, general fault and mild fault. It can also be divided into sudden, gradual, complete machine faults and parts faults according to the speed of the fault and the location of the fault attack; It can also be divided into three categories according to its factors and scene: wear and tear, misuse and weakness. The corresponding parts of each kind of fault are also different, and then the specific analysis of the fault scene and factors.

First, the ship diesel engine fault scene and attack factors

1

Marine diesel engine trouble scene

When the ship diesel engine breaks down, it is usually accompanied by the following scene:

Abnormal sound

The noise produced by a normal Marine diesel engine has certain rules. When something goes wrong, it makes the sound abnormal. For example, when the piston touches the valve, there is a metal knocking sound; When the oil supply Angle is too large, the sound of burning percussion appears; When the cylinder leaks air, it presents boasting sound; When the rotating parts collide, they appear to clash.

The appearance is abnormal

Such as smoke from burning oil; Burning poorly presented black smoke; The leakage of oil and gas due to sealing surface failure.

Temperature anomaly

If the oil supply Angle is too late or the load is too large, the exhaust temperature is too high; Bearing overheating caused by burning loss of the bearing; The water temperature and oil temperature shown by the fault of the cooling system are too high.

Even of abnormal movements

For example, when the balance fails or the foundation is not strong, the oscillation is too large; When the speed regulation failure to present the flying car or the traveling car; The starting system is out of order and the ship diesel engine cannot start up.

5 abnormal pressure

If the valve, piston ring seal failure of the cylinder pressure is too low; Crankcase pressure is too high; The oil pressure of smooth system fault is too low; The problem with the pressurization system is that the pressure is too low and too high.

6 abnormal odour

Such as when the electrical system presents burnt smell; The smell of cooking oil.

Marine diesel engine trouble factors

There are many factors that lead to the fault of Marine diesel engine. Some are caused by improper design and construction and material selection, some are caused by poor quality of processing, production and equipment, debugging, and some are caused by improper operation and protection and maintenance. Here the main operating protection and maintenance and processing and production and other aspects of the formation of fault factors are briefly introduced.

2.1 operational factors

The faults caused by illegal operation account for a large proportion of Marine diesel engine faults. There are ideological lapses, technical infamiliarity, and faulty habits. The common illegal operations include the following aspects:

(1) the starting time is too long.

The cold car starting through the warm car will quickly increase the load of work.

Running-in is not sufficient, then high load work.

Of emergency parking with load.

5 lack of driving.

6 the lack of water driving.

Lilitide overload may be overspeed.

Therefore the water temperature oil temperature is abnormal and therefore continue to work.

Longmont, high speed, high load work in quick parking

2.2 protection and maintenance factors

Failure to protect and maintain in accordance with the rules also causes simple problems. Common fault factors are as follows:

It is not timely to add or replace new oil.

The cleaning of the oil filter is not timely.

Clean diesel filters are not timely.

Of clean air filters are not in time.

5 it is not timely to check and adjust valve clearance.

6, test, adjust the oil supply early Angle was not timely.

• • • the injector is not up to date during monitoring and adjustment.

Therefore to see and to the battery to make up the electrolyte is not timely.

In winter, the ship diesel engine parking water is not timely after parking.

2.3 disassembling and assembling factors in repair

Disassembly fault is also one of the main factors that lead to the fault of Marine diesel engine. There are the following aspects:

The gasket device of the oil injector is incorrect.

The cylinder liner device is not correct.

Gear engagement is incorrect.

(4) the nut arrangement is not correct.

It's/it's about the clearance super value.

6 6 the piston ring device azimuth was not correct.

2.4 factors related to processing and production

Most of the factors in this aspect are the misuse of data, the existence of connotation quality problems in data and some parts of machining are ignored, resulting in its non-compliance with the requirements. Defects in this aspect are difficult to find in the device, after a period of time after the use of exposed, and then form part damage. Its main table now has the following aspects:

The quality is not up to the request.

The material does not conform to the request.

Heat treatment is not in accordance with the requirements.

(4) of machining does not conform to the request.

5 it is not acceptable to eliminate stress.