Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Reciprocating Engine
Reciprocating Engine Overhaul Test #1
| Term | Definition |
|---|---|
| Abrasion | An area of roughened scratches or marks usually caused by foreign matter between moving parts or surfaces. |
| Brinelling | One or more indentations on bearing races, usually caused by high static loads or application of force during installation or removal. Indentations are rounded or spherical due to the impression left by the contacting balls or rollers of the bearing. |
| Burning | Surface damage due to excessive heat. It is usually caused by improper fit, defective lubrication, or over-temperature operation. |
| Burnishing | Polishing of one surface by sliding contact with a smooth, harder surface. Usually, no displacement nor removal of metal. |
| Burrs | A sharp or roughened projection of metal usually resulting from machine processing. |
| Chafing | A condition caused by a rubbing action between two parts under light pressure that results in wear. |
| Chipping | Breaking away pieces of material, that is usually caused by excessive stress concentration or careless handling. |
| Corrosion | Loss of metal by a chemical or electrochemical reaction. The corrosion products are easily removed by mechanical means. Iron rust is an example of corrosion. |
| Cracks | Partial separations of material that are usually caused by vibration, overloading, internal stress, defective assembly, or fatigue. Depth may be a few thousandths, to the full thickness of the piece. |
| Cuts | Loss of metal, usually to an appreciable depth over a relatively long and narrow area, by mechanical means, as would occur with the use of a saw blade, chisel, or sharp-edged stone striking a glancing blow. |
| Dents | Small, rounded depressions in a surface usually caused by the part being struck with a rounded object. |
| Elongation | Stretching or increasing in length. |
| Erosion | Loss of metal from the surface by mechanical action of foreign objects, such as grit or fine sand. The eroded area is rough and may be lined in the direction that the foreign material moved relative to the surface. |
| Flaking | The breaking loose of small pieces of metal or coated surfaces, that is usually caused by defective plating or excessive loading. |
| Fretting | A condition of surface erosion caused by minute movement between two parts usually clamped together with considerable unit pressure. |
| Galling | A severe condition of chafing or fretting in which a transfer of metal from one part to another occurs. It is usually caused by a slight movement of mated parts having limited relative motion and under high loads. |
| Gouging | A furrowing condition in which a displacement of metal has occurred (a torn effect). It is usually caused by a piece of metal, or foreign material, between close moving parts. |
| Grooving | A recess, or channel, with rounded and smooth edges usually caused by faulty alignment of parts. |
| Growth | Elongation caused by excessive heat and centrifugal force on turbine-engine compressor and turbine blades. |
| Inclusion | Presence of foreign or extraneous material entirely within a portion of metal. Such material is introduced during the manufacture of rod, bar, or tubing by rolling or forging. |
| Indentation | Dent or depression in a surface caused by severe blows. |
| Nicks | Sharp-sided gouges or depressions, with V-shaped bottoms, that are generally the result of careless handling of tools and parts. |
| Oxidation | When metals react with atmospheric oxygen, oxidation occurs. Aluminum forms a dense, protective oxide layer that prevents further damage, while iron oxides lack this barrier, exposing the metal and leading to progressive, destructive rusting. |
| Peening | A series of blunt depressions in a surface. |
| Pitting or Spalling | Small hollows of irregular shape in the surface, usually caused by corrosion or minute mechanical chipping of surfaces. |
| Runout | Eccentricity or wobble of a rotating part, such as two bored holes or shaft diameters, or a hole/bushing out of square with the surface. Measured with a dial indicator; limits specify the maximum needle deflection in one full rotation. |
| Scoring | A series of deep scratches caused by foreign particles between moving parts or careless assembly or disassembly techniques. |
| Scratches | Shallow, thin lines and marks, varying in degree of depth and width, caused by presence of fine foreign particles during operation or contact with other parts during handling. |
| Scuffing or Pickup | A buildup or rolling of metal from one area to another, that is usually caused by insufficient lubrication, clearances, or foreign matter. |
| Upsetting | A displacement of material beyond the normal contour or surface (a local bulge or bump). Usually indicates no metal loss. |
Created by:
user-1902449