Cylinder liner wear and cavitation, coolant is the killer！

The heavy duty truck diesel engine work intensity is big, therefore needs each component in the engine to have the high strength and the rigidity.

As an important and easily damaged part of the engine, the cylinder liner is always under high pressure, high temperature and high speed friction of the piston, once the maintenance is not in place or improper use, it is very likely to cause some failure.

Engine cylinder liner for a long time in the complex and changing environment, it is easy to appear cylinder liner wear and deformation and rust, thus affecting the engine power, economy and service life.

Today, let's talk about the common causes of cylinder liner wear and maintenance methods.

The main causes of wear and corrosion of cylinder liners

Our common engine cylinder liner is mainly divided into wet and dry type two, the main difference is whether they are in contact with the coolant.

Dry cylinder liners are commonly used on petrol engines or diesel engines with low horsepower.

The most common type of cylinder liner on trucks is the wet type.

The outer surface of the cylinder liner is in contact with the engine coolant, which facilitates the heat transfer between the cylinder liner and the coolant, and provides better heat dissipation and cooling effect.

If the air filter is not cleaned and maintained for a long time or buy a poor quality air filter, filtering effect becomes poor, will accelerate the cylinder liner wear.

In general, the cylinder inhalation air is too dirty, its wear and tear of the largest part mainly concentrated in the cylinder liner in the upper.

Not regularly replaced oil: if not regularly replaced oil, the oil contains impurities or abrasive debris may be splashed to the cylinder wall, causing abrasive wear.

Poor lubrication conditions: engine in operation, the upper part of the cylinder liner adjacent to the combustion chamber, the overall temperature is very high, lubrication conditions are relatively poor, coupled with the diesel engine load is too large, it is not easy to form a good oil film, resulting in the cylinder liner and the piston ring can not get a reliable and efficient lubrication effect, resulting in local dry friction or semi-dry friction, resulting in the upper part of the cylinder wear.

Chronic corrosion: We all know that the high sulphur content of fuel tends to produce strong acids after combustion, which can cause and exacerbate corrosion and wear on metal parts of the engine.

In addition, the use of poor quality coolant or a long period of time without replacement coolant, is also an important reason for cylinder liner corrosion.

This wear is characterised by the formation of loose holes in the cylinder liner locally.

This type of engine failure is still common due to long term failure to change the antifreeze or the use of poor quality antifreeze.

Some people may think that antifreeze only plays a cooling role, but in fact antifreeze also has anti-scaling, anti-corrosion and anti-foaming formulas added to it.

Not only can it effectively reduce the production of air bubbles and protect the cylinder liner from normal use, it can also protect the cylinder liner and rubber seals and extend the overall life of the car, functions that water and poor quality coolants do not have.

However, we need to note that even good antifreeze has a life span, and we need to replace it in time after it expires.

So how to reduce the abnormal wear and corrosion?

The first is to strengthen the filter cleaning and maintenance, so that the air filter, oil filter and fuel filter always keep in good working condition. Strengthening the maintenance of the three filters can effectively reduce impurities into the cylinder, thus reducing cylinder liner wear and extending engine life.

If the vehicle is working in harsh conditions, the relevant filters can be changed in advance to keep the vehicle in better condition.

The next step is to use compliant oils and fuels, choosing the best viscosity for the season and engine performance, and regularly checking and maintaining the quantity and quality of lubricants.

It is important to note that some inferior oils will thin at higher temperatures, while others will thicken due to poor thermal oxidation stability, resulting in a significant reduction in lubrication.

And poor quality oil has a poor cleaning ability and cannot carry away all the impurities, which can then cause internal engine wear.

You also need to pay attention to the choice of coolant, regularly check the quantity and quality of coolant, and maintain a normal replacement frequency. We have mentioned above the dangers of using poor quality coolant, which is one of the important factors causing cavitation and wear of the engine cylinder liner.

Maintain the normal operating temperature of the engine and avoid too low or too high temperatures.

According to information, the normal working temperature of the engine should be in 80 to 90 degrees Celsius.

If the temperature is too low, the engine can not maintain a good lubrication role.

If the temperature is too high, it will make the cylinder strength decrease, the lubricant viscosity drop, and then intensify the cylinder liner wear.

Proper and correct maintenance of the truck can effectively extend the service life of the vehicle. Maintenance and replacement of three filters, selection of high-quality oil and coolant, to maintain the appropriate engine operating temperature and maintain normal mechanical performance of the engine, etc. , are the main methods to reduce the abnormal wear and cavitation of engine cylinder liner.