Identification of the Cylinder Damages

Identification of the Cylinder Damages Points : Identification of the Cylinder Damages, Identification of internal combustion engine Cylinder Damages Using a droplight, closely inspect the surface of each cylinder wall. Look for vertical scratches scoring or cracks. Rub your fingernail around in the cylinder. This will keep you feel and locate problems. The cylinder walls may he scratched scored, or worn out, out of round, or tapered cylinder.

Cylinder taper is the difference in the diameter at the top and bottom of the cylinder. It is caused by less lubricating oil at the top of the cylinder. Move oil splashes on the lower area of the cylinder. As a result the top of the cylinder wear faster (larger) than the bottom producing a taper.

Cylinder out of roundness is a difference in cylinder diameter when measured front-to-rear and side-to-side in the block. Piston thrust action normally makes the cylinder wear more at right angles to the centerline of crankshaft or piston pins.

Experience shows that chief cause of war in engines is foreign matter, corrosion, and in some cars directs metallic contact. Larger the cylinder bore the less is the damage from the corrosive wear.

The wear due to abrasives will be a function of the concentration of abrasive materials in the oil. For all types of w. engines with large cylinders have a theoretical advantage over engines iii which these parts are small. General experience indicates that larger cylinders attend to nave longer life than small ones. However, this result may be influenced it past by the fact that large engines are generally sued under conditions relatively fire from dust and with excellent systems.

The rate of wear on cylinders bores is largely dependent on the design of the engine, the metal used and the type n piston and rings employed. Slack pistons invariably set up a clatter, referred to as piston slap, which is particularly noticeable when the engine is cold. Compression is lost when the rings lose their sealing properties, and oil and petrol consumption increase in proportion to the decree of wear. Blue smoke emitted with exhaust gases, often accompanied by the persistent oiling up of me sparking plugs, and oil fumes coming from the engine breather are good indicators for at least piston ring attention.

Continual rubbing on me cylinder bore walls is accelerated by the necessary radial pressure inherent it the ring itself. Consequently the Face of the ring gradually wears.