Analysis of insufficient power of Cummins Engine

What are the reasons for lack of Cummins engine power? Here's a detailed analysis.

First, cooling and lubricating system is out of order

The diesel engine is overheating, due to the cooling and lubrication system have caused by fault in this case leads to high temperature and temperature, prone to the cylinder or piston ring death phenomenon. When the diesel engine exhaust temperature increases, should check the cooler and radiator, remove scale.

Two, cylinder head group failure

(1) due to the exhaust air leakage caused by insufficient intake or mixed air exhaust gas, which led to inadequate combustion of fuel, power decline. Should be grinding with the valve and valve seat surface, in order to improve the tightness, renewed if necessary.

(2) the cylinder cover and body joint surface of the cylinder gas leakage would enter the water or oil, causing cooling fluid into the Cummins engine body, if not timely will result in a "sliding tile" or black smoke, so that the shortage of Cummins engine. Because the cylinder gasket is damaged, there will be an air flow out of the cylinder pad when changing speed. When the Cummins engine runs, there will be blisters at the gasket. At this moment, the cylinder head nut or the cylinder head gasket should be tightened according to the specified torque.

(3) incorrect valve clearance will cause air leakage, resulting in Cummings engine power decline, and even difficult to fire. The valve clearance should be adjusted again.

(4) the valve spring damage will cause the valve return difficult, the valve leakage, reduce the gas compression ratio, resulting in insufficient power of Cummins engine. The damaged valve spring should be replaced in time.

(5) the leakage of the fuel injector installation hole or the copper pad damage will cause the lack of cylinder, which makes the Cummings engine lack of power. Remove the repair and replace damaged parts. If the inlet temperature is too low, it will lead to the loss of heat dissipation. At this point, the temperature should be adjusted to meet the required value.

(6) rod bearing and crankshaft surface plucking

This condition will be accompanied by abnormal sound and oil pressure drop phenomenon, which is due to oil pump damage, road blocked oil filter, blocked, or hydraulic oil is too low or even caused no oil and other reasons. At this point, you can disassemble the side cover of the diesel engine, check the big side of the connecting rod and the gap, see whether the connecting rod can move around, if not move, it means that the hair has been bitten, should repair or replace the connecting rod bearing.

At this time, for the turbocharged diesel engine, in addition to the above reasons make power down, if the intake pipeline supercharger bearing wear, press and turbine by dirt blockage or leakage, also can make the engine power down. When the turbocharger appears above, the bearings should be checked or replaced separately, and the inlet pipe, shell, cleaning impeller, and the nut and clamp of the coupling nut should be screwed up.

Three, piston and cylinder liner injury

Because of the piston and the cylinder pulled serious or worn and piston ring sticking caused by friction loss increases, which increases the mechanical loss of Cummins engine itself, the compression ratio decreases, difficult ignition or combustion is not sufficient, under inflation increases, serious leakage. At this time, should replace the cylinder, piston and piston ring.

Four. Exhaust system failure

The exhaust pipe blockage will cause the exhaust flow, fuel efficiency decreased. Power decline. The exhaust pipe should check whether the inner carbon caused by too many exhaust resistance increase. General exhaust back pressure should not exceed 3.3Kpa, usually should be regular ofqingjiang coke exhaust pipe.

Five. Air intake fault

The air filter not clean will cause the resistance to increase, the air flow reduces, the inflation efficiency drops, causes the Cummings engine to be short of power. The diesel air filter core should be cleaned or the dust on the paper filter element should be removed, and the filter element should be replaced if necessary.

Six, engine fuel system failure

(1) the fuel filter or pipeline enters air or jam, resulting in the oil circuit is not smooth, lack of power, and even difficult to fire. Remove air into the pipeline, cleaning diesel filter, replace if necessary.

(2) fuel injection parts damage caused by oil leakage, scuffing or atomization bad, at this time easily lead to missing cylinder, Cummins engine power shortage. It should be cleaned, grinded or renewed in time.

(3) fuel injection pump insufficient fuel will cause power shortage, should be timely inspection, repair or replacement of parts, and re adjust the fuel injection pump fuel quantity.

(4) the fuel supply advance angle is too large or too small, the fuel supply advance angle is too large or too small will cause the pump injection time is too early or too late (early fuel injection time of combustion is not full, too late will take the white smoke, will fuel combustion is not sufficient), the combustion process is not in the best condition. You should check the injection screw shaft adapter is loose, if loose, should be re adjusted in accordance with the requirements of the fuel supply advance angle, and tighten the screws.

Only in time to identify the causes of failure, can effectively avoid waste of time, reduce unnecessary losses. In addition, ground maintenance maintenance is an important content to reduce machine fault.