Diesel engine black smoke causes
1. The fresh air in the cylinder is insufficient
① Too much dust 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 mechanism parts loose, wear, deformation, camshaft gear and crankshaft timing gear relative position change, valve opening and closing time is not correct.
2. The cause of temperature and pressure drop at the end of cylinder compression
① Cylinder and piston ring wear too much, piston ring installation is not correct or loss of elasticity caused by cylinder leakage.
② Valve clearance is too small, hot car is easy to be pushed open, or valve ablation, carbon accumulation caused by
poor cylinder seal.
③ The cylinder head and the body, the injector and the 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 volume of combustion chamber increases, compression ratio decreases.
3, diesel atomization is poor
(1) The injector pressure () is adjusted too low.
② Pressure regulating spring of fuel injector is broken or hairpin.
Fuel injector needle valve and seat carbon, needle valve stagnation 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.
4. The oil supply time and quantity are not correct
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, so that the oil supply is too much.
Diesel generator set black smoke troubleshooting measures
Can be calibrated by adjusting the injection pump, according to the cause of the fault, one by one adjustment, maintenance, such as injection timing is not correct, should loosen the injection pump universal joint, according to the provisions of the adjustment; If the air filter is removed and the black smoke in the back row is reduced, the filter element should be cleaned or replaced; Improved driving practices; The fuel injection pump and injector shall be adjusted by the repairman.
1. The ignition is ahead of schedule, and the ignition Angle is delayed.
2, too much oil supply, too thick mixture, reduce oil supply
3. Adjust the timing gear of camshaft adjustment when it is not correct.
4. If there is a problem with the oil circuit, replace the oil pipe and replace the filter
