Cylinder Liner Honing

and Laser Diameter Measurement

-With Chris-Marine equipment 

In recent years, due to environmental protection requirements, almost all ships have changed their fuel oil to low sulfur oil,However, due to the residue of catalyst added in the manufacture of low-sulfur oil, there will be a lot of small particles and hardness (Mohs hardness of 8, only compared with diamond) of powder mixed in the fuel, which greatly aggravates the wear of the inner wall of the cylinder liner.

 Due to the complexity of the ship's working conditions, the ship's high-temperature cooling water is sometimes insufficient because of the temperature, the inner wall of the cylinder liner condenses into water, forming some dioxide on the inner wall of the cylinder liner.

Some sulfur dioxide is formed on the inner wall of the cylinder liner, which combines with the water to form dilute sulfuric acid, which corrodes the inner surface of the cylinder liner and causes cloverleaf-shaped wear.
 Due to the cylinder oil does not fit or feed rate is too low, etc., may also make the cylinder liner wall and piston ring lubrication is not enough, the formation of line, if not dealt with in a timely manner will be sticky bite, serious damage to the cylinder liner and piston ring.
 

According to the manufacturer's standard, the roughness Ra≤1.0 micron (WIN GD) ≤1.6 micron (MAN) is required for new cylinder liner, while for old cylinder liner, if the ellipticity exceeds 1mm or the wear degree exceeds 8 thousandths, the cylinder liner must be replaced.
For the old cylinder liner, if the ellipticity is more than 1mm or the wear degree is more than 8 thousandths, then it must be replaced, i.e. the wear size of the cylinder liner of 500mm bore is 3.5-4.0mm.
When the wear rate of the cylinder liner is less than 0.15 mm/1000 hours, the manufacturer usually considers this as normal wear.
When the wear rate of the cylinder liner is less than 0.15 mm/1000 hours, the manufacturer usually considers this to be normal wear. This wear rate will result in a 500 mm bore cylinder liner life of between 35,000 and 40,000 hours, which is equivalent to 5-7 years of service.
This equates to 5-7 years of service. In such cases, it is common to replace the cylinder liner at the first overhaul rather than reconditioning the liner.
operating condition. The use of Chris-Marine liner honing equipment can be used on cylinder liners that are in poor condition but still have honing value (wear within 5 parts per thousand is optimal and recommended).
(wear within 5 parts per thousand is optimal, 6 parts per thousand is not recommended), extends the service life of the cylinder liner and reduces the need for unnecessary Cylinder Liner Replacement

 

Advantages of cylinder liner honing:
- After honing process, it can reduce the ellipticity, eliminate the steps and prolong the service life.
- Cylinder liner inner wall surface formation honing pattern, in the engine working process, honing grain storage of lubricating oil can be timely supplied to the operating surface, the speed of rebuilding the oil film is greater than the speed of squeezing out.
During the engine working process, the lubricating oil stored in the honed grain can be supplied to the moving surface in time, and the speed of rebuilding the oil film is greater than the speed of squeezing out. Ensure the stability of the oil film in the engine work.
- The honed cylinder liner can reduce all kinds of abnormal wear and corrosion (cold corrosion, abrasive corrosion, etc.), and then the cylinder liner wear and loss is reduced to the normal range.
The honed cylinder liner can reduce abnormal wear and corrosion (cold corrosion, abrasive corrosion, etc.), thus reducing the wear and tear of the cylinder liner to the normal range, prolonging the overhaul interval of the engine and bringing economic benefits to the users.
- If the piston ring or cylinder liner is replaced, honing will create good conditions for the initial friction between the cylinder liner and piston ring.
After that, through the subsequent cylinder liner operation and management, it can reduce the amount of cylinder oil and engine operating costs.
At the same time, if you can't buy a new cylinder liner on the market, you can also use honing to extend the life of the cylinder liner for half a year to one year, and wait for the arrival of the new cylinder liner.