1, the use of improper harm

(1) The crank chamber has a poor air circulation or no circulation

Baotou North Ben heavy truck accessories in the crankcase of the exhaust cycle is not smooth or not circulating, is caused by diesel combustion chamber carbon deposition, crankcase sludge deposition, the surface of the film attached to the film, as well as the piston ring ring, oil up and corrosion wear important factor.

Diesel engine work, the crankcase ventilation is poor, in the intake stroke, will cause the combustion chamber negative pressure is too large (far below the crankcase pressure), leaving a lot of oil fleeing into the combustion chamber, generate a large number of The carbon surface accumulates in the combustion chamber and the piston ring and other areas. At the same time, a large number of too high temperature accumulation of gas in the crankcase, but also cause the lubricating oil and crankcase to the piston ring between the body temperature is too high to accelerate the oxidation of lubricating oil deterioration. The oxidized soluble solid oxide in the lubricating oil, under the catalysis of high temperature and oxygen and the formation of complex oxides and unsaturated lacquer mixture surface adhesion to the surface of the parts, and further with the combustible mixture of carbon Oxidation is condensed into a paint film, attached to the surface of the crankcase and the surface of the connecting rod, piston skirt and piston pin. The higher the temperature of the body and the lubricant, the more paint is produced. Moreover, the high oil temperature will cause the oil to become thinner, evaporated, into a granular oil mist, the vent tube was sucked into the combustion chamber; serious, but also cause the diesel engine “speed” and other failures.

When the temperature of the body is too low, fleeing into the crankcase of the exhaust and unburned oil and gas, after the formation of acidic material surface deposition in the lubricating oil, and further deterioration of the lubricating oil and corrosion of mechanical parts wear. Moreover, some of the high boiling point components in the exhaust gas and water vapor condensation and lubricating oil mixture, but also lubricating oil and unburned oil and gas in the liquid phase oxide further polycondensation, the formation of sticky material. These viscous substances are further bonded to the solid matter, water vapor, charcoal, scrub and lubricating oil in the crankcase to form sludge, deposited in the sump, lubricating oil and filter nets, causing oil Road clogged.

Data show that in recent years the production of high-strength, high compression ratio and the use of fuel direct injection (DGI) and oil pan volume smaller diesel engine, if the crankcase ventilation is poor, but also increase the viscosity of lubricating oil , Increased oxygen content and acid value increased, resulting in the slippery oil (a carbon-like sediments, generally colloidal suspension in the lubricating oil) generation.

In addition, the crankcase of the exhaust gas is not circulating or poor circulation, but also lead to diesel engine idle instability, smoke abnormalities, power down, fuel consumption and hot start difficult.

The main factors that affect the exhaust gas exhaust or not exhaust in the crankcase of the Baotou North Ben heavy truck accessories are: the one-way flow control is damaged or the opening is jammed; the ventilation and sag is blocked, the waste gas (water) gas separator is blocked, Hose aging causes adhesion.

(2) crankcase air intake is not good or not into the air

Crankcase air intake is not good or not into the air, is the result of excessive consumption of lubricating oil and accelerated deterioration of the main factors.

Diesel engine work, due to fleeing into the crankcase of the exhaust gas, in the intake of suction into the combustion chamber, and the crankcase due to the intake channel blockage and other factors, and can not be timely to add the right amount of air, causing combustion The positive pressure of the chamber is too large (the vacuum inside the crankcase is too large), so that the pure air into the cylinder and the combustion of a large number of flue gas into the crankcase, accelerating the oxidation process of lubricating oil and parts corrosion wear and tear. At the same time, the oil pan inside the oil mist and lubricating oil will be sucked into the valve rocker room, the valve or air metering valve, intake pipe into the combustion chamber, causing excessive consumption of lubricants.

In addition, the air into the cylinder after a large number of fleeing into the crankcase, but also lead to the end of the diesel engine compression when the number of air in the cylinder down, the temperature, the pressure is too low, resulting in combustible mixture combustion is not complete, exhaust pipe smoke abnormalities, power , Fuel consumption increases, idle instability and idle flameout, and start a series of difficulties such as failure.

The main factors that affect the crankshaft air intake or non-intake are: intake oil (water) gas separator dirt too much or blocked, the intake hose aging adhesive and air filter dirty.

(3) Unidirectional flow control valve is tightly closed or ventilated hose is broken

Unidirectional flow control valve closed or ventilated hose damage, in addition to the crankcase due to poor ventilation caused by the hazards, but also cause air filter short circuit, so that the air into the cylinder dirty, accelerate the piston, cylinder and piston ring Of wear.

2, the correct use of crankcase forced ventilation and maintenance

(1) regular cleaning crankcase ventilation

When the machine is running about 15000-20000km, the diesel oil (water) gas separator, the one-way flow control valve and the ventilation pipe should be cleaned to remove the carbon deposits and dirt on the surface of the parts to ensure the technical performance of each machine In good condition.

(2) to strengthen the storage and maintenance of outage diesel engines

Engineering machinery or cars, the general stop for more than 30 days, should be stopped before the storage and maintenance. Before the storage in addition to the crankcase ventilation parts of the machine should be thoroughly cleaned, but also the crankcase and the combustion chamber of the exhaust gas to be completely ruled out and replace the axle box of lubricants, add the lubricating oil should be free of pollution and appropriate To carry out dehydration treatment.

When the storage, the crankcase ventilation device of the connection nozzle and the connection hose, should be sealed (smear some grease, and moisture-proof paper bandage, etc.) to prevent air into the hose and cracks, aging and so on.

(3) reasonable selection and filling of lubricants

Through a large number of fault analysis confirmed that the oil and gas separator and the nozzle is mainly due to the selection of the quality of the poor lubricants, and under the action of high temperature caused by sediment and other dirt caused. Therefore, reasonable and correct selection of the quality of lubricating grade, is to effectively improve the use of lubricating properties, to prevent the formation of an important guarantee of various deposits.

The lubricating oil quality grade (API) is divided according to the degree of diesel engine heat load, the size of the mechanical load and the ease of operating conditions. Diesel (C series) from low to high into CC, CD, CD-Ⅱ, CE, CF-4 and other five levels. The higher the grade, the more stable the performance of the lubricating oil, the higher the reliability, the better the corrosion resistance, the oxidation resistance, the anti-wear and the anti-high and low temperature sludge deposition.

In addition, in the course of the use of different quality, viscosity grade and type of lubricants prohibited blending use. When filling lubricants, the place must be free of pollution, no sand, the utensils must be clean, to prevent water, dust and other dirt intrusion.

(4) other precautions

Strengthen the Baotou North North heavy truck accessories to connect the mouth of the sealing inspection and tightening work to ensure that no leakage and damage.

Regularly clean and replace the air filter filter, to maintain a good technical state.

The connection hose should be no aging, crack, broken bond phenomenon.