Reasons for lack of power of refrigerated truck diesel engine
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Unclean air cleaners The lack of clean air filters can cause increased resistance, reduced air flow, and reduced aeration efficiency, resulting in insufficient engine power. The diesel air cleaner cartridge should be cleaned or dust should be removed from the paper filter element, and the filter cartridge should be replaced if necessary.
If the fuel supply advance angle is too large or too small, the fuel injection angle will be too early or too late. If the fuel injection time is too early, the fuel will not be fully burned. If it is too late, white smoke will be emitted. Incomplete combustion also occurs, making the combustion process not optimal. At this time, check whether the fuel injection drive shaft adapter screw is loose. If it is loose, adjust the fuel supply advance angle as required and tighten the screw.
Pistons and cylinder liners are damaged due to serious or worn pistons and cylinder liners, and increased friction loss caused by piston ring cementation, resulting in increased engine mechanical loss, reduced compression ratio, difficulty in ignition, or insufficient combustion. Inflated under the increase, serious air leakage. At this point, the cylinder liner, piston and piston ring should be replaced.
The fuel system is faulty (1) The fuel filter or the pipeline enters into the air or becomes obstructed, causing the oil path to be blocked, insufficient power, and even a difficult fire. The air entering the pipeline should be removed, the diesel filter cleaned, and replaced if necessary.
(2) Damage to the fuel injection coupling causes oil leakage, seizure, or poor atomization, which can easily lead to missing cylinders and insufficient engine power. Should be cleaned, ground or replaced in a timely manner.
(3) Insufficient fuel supply to the fuel injection pump will also result in insufficient power. Check, repair or replace the coupling parts in time and readjust fuel supply to the fuel injection pump.
The cooling and lubrication system is faulty The diesel engine is overheated due to a failure in the cooling or lubrication system. In this case, the water temperature and the oil temperature will be too high, and the cylinder or piston ring will be stuck. When the exhaust temperature of the diesel engine increases, the cooler and radiator should be checked to remove scale.
The cylinder head group is faulty. (1) The lack of intake air due to the exhaust gas leakage or the exhaust gas mixed with exhaust gas leads to insufficient fuel combustion and the power drop. The mating surfaces of the valve and the valve seat should be repaired to increase their tightness and be replaced if necessary.
(2) Leakage at the joint between the cylinder head and the body will cause the air in the cylinder to enter the water channel or the oil passage, causing the coolant to enter the engine body. If it is found that it is not timely, it will lead to “slippery shoes†or black smoke, thus making the engine Lack of motivation. Due to the damage of the cylinder head gasket, there will be a flow of air from the cylinder head during gear change. When the engine is running, there will be blisters at the gasket. Tighten the cylinder head nut or replace the cylinder head gasket according to the specified torque.
(3) Incorrect valve clearance can cause air leakage, resulting in a decrease in engine power and even difficulty in ignition. The valve clearance should be re-adjusted.
(4) Damage to the valve spring will result in difficulty in returning the valve, leakage of the valve, and reduction in the compression ratio of the gas, resulting in insufficient engine power. Damaged valve springs should be replaced promptly.
(5) Air leakage or copper mat damage to the injector mounting hole can cause cylinder deficiencies, resulting in insufficient engine power. Remove the inspection and replace the damaged part. If the inlet water temperature is too low, heat loss will increase, and the inlet temperature should be adjusted to meet the specified value.
The occurrence of the biting of the connecting rod bearing and the crankshaft connecting rod journal surface is accompanied by an abnormal sound and a drop in oil pressure. This is due to blocked oil passage, oil pump damage, blocked oil filter, or oil. Hydraulic pressure is too low or even caused by oil. At this time, the side cover of the diesel engine can be disassembled, and the clearance between the side of the big end of the connecting rod can be checked to see whether the big head of the connecting rod can move back and forth. If it cannot move, it indicates that the hair has been bitten and the connecting rod bearing should be repaired or replaced.
In addition to the above problems, there are other reasons that lead to insufficient power of the diesel engine. For example, the intake line of the press is blocked by the smudge. In general, for the normal operation of diesel engines, the best periodic inspections should be conducted to find that the problem is solved in time, otherwise it will affect the life of the engine.