Effect of coolant temperature on diesel engine
1, poor lubrication. Coolant temperature of more than 95 degrees Celsius, will make the V3 parts of the North ran lubrication oil temperature increase and become too thin, with the sub surface is difficult to form a lubricating film, semi dry friction and even dry friction. At the same time, because the cylinder temperature is too high, the cylinder lubricating oil easily burnt, carbon deposition, prompting parts wear quickly, can cause severe scuffing, axle bush burning accident.
2, damage with clearance. The metal parts of the diesel engine can be reduced in strength, elasticity and wear resistance under high temperature, meanwhile, the high temperature causes the parts to be expanded and deformed, which seriously affects the normal clearance of the matched parts and even dies.
3, the inflation efficiency is reduced. The air into the cylinder is heated, the air density is decreased, and the inflation rate is decreased. Because of the relative reduction of air intake, the air fuel ratio becomes smaller, the combustion is not sufficient, the exhaust pipe smoke, diesel engine output power decreased.
The influence of coolant temperature too low on the diesel engine
1, increase the mechanical loss. Coolant temperature is too low, so that the lubricating oil temperature will be reduced, and its mobility becomes worse, not only increases the wear of parts, but also increases the mechanical loss due to the increase of friction resistance.
2, the cylinder wall caused by corrosion. The cylinder temperature is too low, the cylinder water vapor condenses on the wall. Some of the products of combustion diesel combustion generated (such as sulfur dioxide) encountered condensation water on the cylinder wall, cylinder wall will form a strong corrosive agent (sulfite, sulfate) adhered to the wall. In order to be strong wall corrosion, the surface of the metal porous structure. When the cylinder liner and piston ring friction between the scraping, the metal surface coating, corrosion, or pits on the cylinder working surface.
3, increase in heat loss. The diesel engine working at low temperature, the cooling liquid in the cylinder to take away a lot of heat, the heat loss increases; as the fuel in the cylinder combustion is incomplete, not only will scour the cylinder lubricating oil film, dilute the lubricating oil sump, and increases fuel consumption, reduce the output power.
4, combustion deterioration. In the diesel engine, high temperature compressed gas is necessary for fuel ignition, when the cylinder, piston and other parts when the temperature is too low, will cause the compression end temperature decreased, ignition delay, combustion deterioration, fuel combustion is incomplete, crude, black smoke exhaust.
Good habits to ensure that the cooling water temperature will not be abnormal
1, regularly check or replace the coolant
A variety of anti rust agent, anti foam agent, etc., can effectively reduce the corrosion of the cooling system and the production of cooling liquid foam. And after a long time, these additives will be consumed, so we need to replace the new coolant.
2, can not replace the coolant water
Daily use of the car, we must not replace the use of water for long-term use of special coolant, water can only be used as a special case of emergency use.
First of all, the boiling point of water is lower than that of special coolant, which is more likely to evaporate, so the use of water as a coolant is often added. Secondly, without special treatment of the water contains many minerals, long-term use will produce scale in the water pipe, when the scale is accumulated to a certain extent, it will reduce the efficiency of the circulation of water in the water pipe, the cooling effect of cooling system.
Finally, the water is very easy to freeze in winter, especially in the northern region, may be parked overnight after the vehicle, the water will be frozen in the V3 parts of the water tank expansion, resulting in serious damage to the body.
3, regular cleaning of the tank and the engine compartment of the dust
In the process of moving vehicles, the head-on collision of high speed wind can help to take away the heat on the surface of the water tank. If the water tank surface area more dust, then the heat dissipation effect will be greatly reduced.
Cleaning up the V3 parts water tank or the engine compartment dust, we should avoid water directly to the engine compartment flush, so there may be caused by wire connector off, damage to the original electronic. The correct approach should be the use of high pressure air gun in the dust accumulation of more location blowing. It is recommended that everyone in each vehicle maintenance or to wash the car, so that service station maintenance staff or car wash shop staff to help clean up the dust in the engine compartment with the wind gun.