The black smoke emitted by diesel engine exhaust gas is the phenomenon that the diesel is not fully burned, and the carbon is decomposed at high temperature and emitted with the exhaust gas. Exhaust emissions of black smoke, not only reduce the power of the engine, increase the consumption of diesel, and easy to form carbon deposition, shorten the service life of the engine. The reasons are as follows:
First, the fresh air in the cylinder is insufficient.
1. Excessive dust accumulation in the filter element of the air filter.
2. Muffler rust, carbon or oil.
3. The inlet and exhaust valve clearance is too large, so that the valve opening is reduced.
4. The parts of the mechanism are loose, wear and deformation, the relative position of camshaft gear and crankshaft timing gear changes, and the valve opening and closing time is incorrect. Cummins generator maintenance.
Two, cylinder compression at the end of the temperature and pressure drop reason:
1. The cylinder and piston ring wear too much, and the piston ring is installed incorrectly or loses elasticity, resulting in air leakage of the cylinder.
2. Valve clearance is too small, hot car is easy to be pushed open, or valve ablation, carbon accumulation caused by the cylinder seal is not strict.
3 cylinder head and body, fuel injector and cylinder head joint surface leakage.
4. Serious valve sag, piston and piston pin, piston pin and connecting rod small head, connecting rod big head and connecting rod journal clearance is too large, so that the combustion chamber volume increases, compression ratio decreases.
Three, diesel atomization bad reasons:
1. The injector pressure is adjusted too low.
2. Fuel injector pressure regulating spring is broken or hairpin.
3. Fuel injector needle valve and seat carbon, needle valve stuck or wear too much.
4. The pressure relief ring belt of the oil outlet valve of the fuel injection pump is worn too much, so that the fuel injector drops oil.
Four. Reasons for incorrect oil supply time and oil supply quantity:
1. Oil supply time is too late.
2. At the beginning of starting, the gas pressure and temperature are low and the oil supply time is too early.
3. Increase the oil supply stroke after the plunger couple of fuel injection pump is worn.
4. The travel of the adjusting tooth rod or pulling rod of the fuel injection pump is too large, resulting in too much oil supply.
Jiangsu Meiao Power Technology Co., Ltd. is an important manufacturer of diesel generators. The company mainly manufactures and sells diesel generator sets with power of 3-3000kW, mobile power station of 24-600kW, Marine emergency diesel generator set of 24-800kW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, static speaker, mobile lighthouse, container, etc.) diesel generator At the same time, we are engaged in generator set maintenance and after-sale service of generator set accessories.
