Marine diesel engine parts are difficult to start

1, the phenomenon of failure

When it is found that the startup is difficult, there are the following situations:

(1) At the time of starting, the crankshaft does not move at all or the rotation is very slow, that is, the starting speed is too low.

(2) When starting, the starting speed is normal, but the marine diesel engine does not catch fire.

(3) At the time of starting, although the diesel engine of the ship was on fire, the diesel engine of the ship was not working properly, the speed was unstable, and even the fire was extinguished.

2, the cause analysis

(1) Starting system: the gas pipeline leaks or the gas pipe is too long, the gas source pressure is insufficient, and the air compressor is damaged.

(2) Fuel system: the oil pressure low parking lever is not under the plate, the fuel tank valve is not open, the fuel tank is not oiled, the fuel tank position is too low, there is air in the fuel line, the diesel filter is too dirty, the overspeed parking device is not reset, the tooth The strip is not in the refueling position, the injector is not atomized, the fuel pump does not pump oil or the injector does not spray oil.

(3) Intake and exhaust system: the air filter is fouled, the intercooler is fouled, the explosion-proof door valve is not opened, the timing of the gas distribution is incorrect, and the exhaust system is fouled.

(4) Combustion system: The compression pressure is insufficient, the clearance between the piston and the cylinder head is too large, too small, and the cylinder head extends too far and too small.

(5) External conditions: start with load, the oil temperature is too low, the viscosity is too large; the water temperature is too low, it freezes in the water pump; the diesel temperature is too low, the viscosity is too large.

(6) Internal conditions: the valve touches the piston or the cylinder has foreign matter; burns the tile, holds the shaft, and pulls the cylinder.