Wear Liner And Proper Maintenance
Engine cylinder liner and piston ring
in high temperature, high pressure, alternating load and corrosion conditions to work under a pair of friction pairs. Long-term work in the complex case, the result is caused by the cylinder sets Wear and tear Deformation affects the engine Power , Economy and service life. Careful analysis of the causes deformation of cylinder liner wear, use for improving the economy of the engine are very important.
I. Causes of cylinder liner wear
Cylinder working environment is very bad, there are many reasons causing wear. Structural reasons are usually allowed as normal wear and tear, but the use and Service Properly, will result in abnormal wear and tear.
1 structural causes wear and tear
1) lubrication is not good, so put on the Department of badly worn cylinder. Department of cylinder wear a neighboring chamber, high temperature, lubrication conditions are poor. Fresh air and no erosion and dilution of fuel evaporation, exacerbating the deterioration of the upper terms, so that both cylinder friction or semi-dry friction in the state, which is the upper cylinder wear and tear caused by serious reasons.
2) upper pressure, causing the cylinder goes to-heavy wear. Piston rings in their stretch and squeeze in under the effect of back pressure on the cylinder wall, the greater the positive pressure, lubricant film formation and maintenance of the more difficult, increased mechanical wear. Making power trip, with the piston downward, pressure is gradually reduced, and thus goes to-heavy cylinder wear.
3) mineral acids and organic acids to make the cylinder surface corrosion spalling. Combustible gas mixture within the cylinder after combustion to produce steam and acidic oxides, which produce mineral acids soluble in water, coupled with burning of organic acids generated on the cylinder surface corrosion, corrosion gradually in the friction scraping piston ring out, resulting in deformation of the cylinder sleeve.
4) into the mechanical impurities, so that the central cylinder wear increased. Airborne dust, oil and other impurities into the piston and cylinder wall, causing abrasive wear between. Dust or impurities in the cylinder with the piston in reciprocating motion, due to the central position in the cylinder the maximum velocity, it exacerbated the central cylinder wear.
2 wear and tear caused by improper use
1) oil filter filtration poor results. If the oil filter not working properly, oil is not effectively filtering, contains a lot of hard particles of the oil is bound to wear increased cylinder kit Bi.
2) air filter filtration efficiency is low. The role is to clear the air filter the air entering the cylinder contained in the dust and sand, to reduce the cylinder, piston and piston rings and other wear parts. Experiments show that if the engine air filter, cylinder wear and tear will increase 6-8 times. Long-term lack of air filter cleaning and maintenance, filtration poor results, will accelerate the wear of cylinder liner.
3) prolonged low temperature operation. Long low-temperature operation, First, it causes bad combustion, Coke Put on the Ministry started to spread from the cylinder, so that the Department of cylinder wear a serious abrasion; second is caused by electrochemical corrosion.
4) frequent use of poor quality lubricants. Some car owners an easier route to save money, often at the roadside shops or unscrupulous traders to buy low-grade lubricant oil, resulting in the strong upper cylinder corrosion, wear big 1-2 times than normal.
3 wear caused by improper maintenance
1) Cylinder improperly located. When installing the cylinder cover, if there is installation error, cylinder and crankshaft centerline axis is not vertical, will cause abnormal wear of cylinder liner.
2) sets of hole deflection of copper rod. In the repair, the hinge connecting rod small end cut copper set, the reamer sleeve sloping hole caused by deflection of copper rod, piston pin center line and the connecting rod small end is not parallel to the centerline, forcing the piston to one side of tilt cylinder , can also cause abnormal cylinder liner wear.
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